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HomeMy WebLinkAbout1987-03-02; Traffic Safety Commission; ; Investigate several traffic issues along Rancho Santa Fe RoadCITY Of CARLSBAD TRAFFIC SAFETY COMMISSION COMMISSION REPORT OF: March 2, 1987 ITEM NO.6-A LOCATION: Rancho Santa Fe Road Between Olivenhain Road and Questhaven Road INITIATED BY: Frank Mannen, Assistant City Manager BACKGROUND: Staff has been asked to investigate several traffic issues along Rancho Santa Fe Road. A copy of the memo is attached that requested study of: 1. Intersection of Rancho Santa Fe Road and Olivenhain Road. 2. Intersection of Calle Barcelona and Mision Estancia. 3. Intersection of Rancho Santa Fe Road and Cadencia Street. 4. Intersection of Rancho Santa Fe Road and Melrose Drive. In addition, the need for additional signing and striping was investigated. DATA: Existing Roadway Conditions For a number of years the 2.7 mile segment of Rancho Santa Fe Road between Olivenhain Road and Questhaven Road was a rural two-lane road with two-way traffic and limited shoulder areas. Due to its designation as a prime arterial, a portion of RSF i s being widened to six (6) lanes from Olivenhain Road to a point 4OO-feet north of Mision Estancia for northbound traffic and to a point approximately 6OO-feet south of La 6-A-1 TRAFFIC SAFETY COMMISSION COMMISSION REPORT OF: March 2, 1987 Continued ITEM N0.6-A Costa Avenue for southbound traffic. Two lanes have been constructed for southbound traffic from Questhaven Road to a point approximately one-half mile north of Cadencia Street. Traffic signals have been installed where Olivenhain Road, Rancho Santa Fe Road and Camino Alvaro intersect and also at the intersection of La Costa Avenue and Rancho Santa Fe Road. In conjunction with the widening of Rancho Santa Fe Road, traffic signals will be installed at two (2) additional intersections -Mision Estancia and Calle Barcelona. Traffic Volumes From a traffic count taken in January, 1987, hour A.D.T. volume on Rancho Santa Fe Road at was 14,811 vehicles. At Melrose Drive the A.D.T. volume on RSF is 18,346 vehicles. Accidents the two-way 24- Cadencia Street two-way 24-hour The total number of reported accidents on Rancho Santa Fe Road between Olivenhain Road and Questhaven Road (not including intersection accidents) for the years 1984, 1985 and 1986 was 19, 19, and 30 respectively (collision diagrams attached). Separate collision diagrams for intersection accidents in 1986 are also included. For 1986, the accident rate expressed in accidents per million vehicle miles on Rancho Santa Fe Road between Olivenhain Road and Quest haven Road was 2.06. As a comparison, the latest accident rate for rural roads in CALTRANS District 11 (San Diego area) was 1. 84. Intersection of RSF and Olivenhain Road At this intersection in the past there were several reported accidents occurring on the free right turn from northbound Rancho Santa Fe Road to eastbound Rancho Santa Fe Road. 6-A-2 TRAFFIC SAF ETY COMMISSION COMMISSI ON REP OR T OF: March 2, 1987 Continued ITE M N0 .6-A Vehicles are required to yield prior to entering the east- bound t raffic lane and driver inattention combined with excessive speed has been an apparent cause of the accidents. The roadway widening that is currently taking place on Rancho Santa Fe Road will allow the vehicles using the free right turn to remain in a separate lane at the intersection as that vehicle proceeds eastbound. Calle Barcelona is approximately 1,400 feet east of the Olivenhain/RSF intersection allowing a sufficient weaving area for turning vehicles to Calle Barce- lona and through traffic to avoid serious conflicts. A portion of the striping plan showing the free right turn lane to Rancho Santa Fe Road is attached. The new construction should result in a decrease in the number of accidents, especially rear-end accidents associated with the free right turn. Intersection of RSF and Cadencia Street Cadencia Street, a residential street, intersects Rancho Santa Fe Road to create a "T" intersection approximately 0.75 miles north of La Costa Avenue. Sight distance on RSF north of the intersection is limited due to a crest vertical curve. However, the available stopping sight distance on RSF when approaching Cadencia Street is approximately 460-feet which is sufficient for the 45 MPH posted speed limit on Rancho Santa Fe Road. The 24-hour two-way A.D.T. on RSF at this location is 14,811 vehicles and the 24-hour A.D. T. approach volume on Cadencia Street is 553 vehicles as shown on the attached Traffic Count Data Sheets. During 1986, there were four (4) reported intersection accidents at this location. Two (2) of the accidents were due to a violation of right-of-way and two (2) due to excessive speed. In 1984 and 1985, respectively, there was one (1) and two (2) reported accidents at the intersection of Cadencia Street and Rancho Santa Fe Road. 6-A-3 TRAFFIC SAFETY COMMISSION COMM ISSI ON REP OR T OF : March 2, 1987 Continued ITEM N0 .6-A As indicated by the traffic counts, volumes are very low on Cadencia Street. Traffic signal warrants (attached) are not met at this intesection when evaluated for volume or accident experience. The CALTRANS Traffic Manual states that the installation of a flashing beacon for advanced warning for may be warranted under one or more of conditions: an intersection the following a. Physical obstruction existing in the roadway or reduction in width. b. Important intersection hidden by an obstruction or sharp curve in the highway. c. Potentially hazardous horizontal or vertical alignment. d. On the approach to a signalized intersection. A side street warning sign has been previously installed on Rancho Santa Fe Road advising motorists of Cadencia Street. Based upon CALTRANS criteria (warrants) for flashing beacons for advance intersection warning, the available stopping sight distance and the accident history, flashing beacons are not required for advanced warning at this intersection. Additional Signi ng and Striping Upon completion of widening of Rancho Santa Fe Road between Olivenhain Road and La Costa Avenue, additional striping and signing will be installed per the approved striping and signing plan. The truck by-pass route will be constructed immediately north of La Costa Avenue and rejoin Rancho Santa Fe Road approximately 0.2 miles north of Cadencia Street also will result in additional signing on Rancho Santa Fe Road. A review indicates of the accident history on Rancho Santa Fe Road that a majority of the accidents were a result of 6-A-4 TRAFFIC SAFETY CO MMISSION COMM I SSIO N RE PORT OF : March 2, 1987 Continued I TEM N0 .6-A excessive speed or a combination of excessive speed and other factors. During 1986, 8.4% of all citations issued by the Traffic Division of the Police Department were for violations on Rancho Santa Fe Road. A work order has been sent to the Utilities and Maintenance Department to install additional 45 MPH speed limit signs on RSF placed at approximately one-half mile intervals. The "S" curve portion of RSF approximately 0.2 miles north of Cadencia Street has been the location of several accidents. To delineate the curved portion of the roadway a work order will be sent to Utilities and Maintenance to reinstall missing raised pavement markers on the centerline striping and to install type F-1 delineators on the side of the road. An additional curve warning sign for northbound traffic will also be installed. Future Alignment of Rancho Santa Fe Road The City of Carlsbad Planning Department is working on a study to revise the La Costa Master Plan. Included in that study will be alternate alignments for Rancho Santa Fe Road and a land use study in conjunction with the alignments. Once several alignments have been identified an environmental impact report will be prepared to aid in selecting the best option. The City Planners have met with a group of citizens and will continue to involve the citizens in the process to choose an alignment for Rancho Santa Fe Road. REC OMM END ATIO N The Traffic Safety Coordinating Committee recommends the following: 1. Complete the free right turn per plan for widening RSF. 2. Do not install a traffic signal or flashing beacon at the Cadencia Street/RSF intersection since warrants are not met. 3. Install additional regulatory and warning signs on RSF. 4. Have the Police Department continue to enforce the 45 M.P.H. speed limit on Rancho Santa Fe Road. 6-A-5 TRAFFIC SAF ETY CO MMISSION COMM I SSION RE PORT OF: March 2, 1987 Continued N£C£SSARY COUNCIL ACTION: I TEM NO.6-A No Council action is required for the recommendations. If a traffic signal or flashing beacon is recommended by the Commission, then the City Co uncil will need to approve the installation and appropriate fun ds. 6-A-6 ,------ January 14, 1987 TO: CITY ENGINEER FROM: Ass i stant City Manager TRAFFIC SAFETY ALONG RANCHO SANTA FE ROAD As a result of the community meeting held in La Costa last Saturday and the Council meeting Tuesday night, your department should look at a number of issues regarding traffic safety along Rancho Santa Fe Road: 1. I nterseGtion of Rancho Santa Fe Road and Olivenhain Road. This issue concerns the free right turn lane f or northbound traffic on Rancho Santa Fe Road coming out of Encinitas and continuing on Rancho Santa Fe Road north into Carlsbad. There was concern expressed about the need for stop signs, s ignalization or possibly closing the free right t urn lane. 2. I ntersection of Calle Barcelona a nd Mission Estancia . I t is my understanding that the current proj ect under construction by the La Costa Ranch Company will also include the installation of signals a t the intersection of Mission Estancia and Rancho Santa Fe Road. I further understand that signals have been designed at Calle Barcelona but will not be constructed until warrants are met. The s ignals at Calle Barcelona and Mission Estancia s hould be constructed as part of the i mprovements c urrently being constructed. 3. I ntersection of Rancho Santa Fe Road and Cade ncia. The Municipal Projects Division has pre pared a preliminary cost estimate for construction o f the signals at this intersection. The estimate i s $75,000. Please review this intersection f or the need for signalization and/or wa r ning l ights. -- January 14, 1987 City Engineer/Traffic Safety Along Rancho Santa Fe Road Page 2 4. Intersection of Rancho Santa Fe Road and Melrose. I understand this intersection is currently under review by the Traffic Engineer and a report will be going to the Traffic Safety Commission soon. In addition, the entire length of Rancho Santa Fe Road in Carlsbad should be reviewed for appropriate signing, striping and other traffic safety items. If you have any questions, please feel free to give me a call. saf cc: City Council City Manager City Attorney Assistant City Manager Patchett Community Development Director Municipal Projects Manager CO LU S \ 0 N DI AG RJ lO CAf ION Ra~'-'-'C' CITY 0~ CARLS BAD I TRAFFIC ENGIN~E RING SECTION NO. ACCID ENTS '=,Y TYPE OAll w IT TIO.I TOTAL INJUIY ,AT4l llOMT l~SG 3 z. 9 =-\ 'c\? 6,~&""1 z.o:o -PY -'D"'"""'· -IN A. 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SB 'R=llo..-i y ' l7-B& 1':=>:"::>D h tp .z.c,::,.€,~ \~:c::;i:; f-?.,.,,.,P~.,,...-,. ~?-INA11 2(.:.:3 \ N ~? £,/;;::,~-1i-\ ~O(.... 1',\e, l<>,,c,~~ '/ • <, ,""\, St.,. z -z.·.ss -p..,. • •l'Z.· \'3~o,S, 'R-. '0..-.""'. ?~-11'.IATT' ?ctt..-:> Se, ~v«.-~~ • 10 • '2,~ 0'1: '3c; -Pvo :~vY'I, 7 Lt~'?> N '<a.1-1.6-. c;,7:qt;; R-. 1::='o.."""", "'7~10 ~e, R=l l=v<!.,\,... zz.:Z.(p -PY,op. v .... v'V\, 6e e,,:,>11 ,zo.~ ,,._ .OC, i==ko :o ... ~. \ LEGEND CONST CONSTRUC~IOH 'ZONE OPO ORl\l(R P><TSIC.\l. OEfECT ... ll(H. IIIOVINQ AH(AO ~ H(AO•ON 0\1 OE'FECTIVE VEHICI.!: ((( ... \l(H. 8ACl<IHG uP ... H(AO•ON ,10£SWIP( • I ... ___ ,. PEDESTRIAN -.0--REAR ENO TRAIN I i -OIIERT.l.l<IHO SIO(SWIP( ·-• ES EXCESS SP(EO FTC FOL.L.OWl"<l TOO CL.CSE ><BO HAO en~ ORINKINO H•R HIT ANO "UN c:::::> PARl<(O \l(HICL.C --~~ RIGHT ANQL.( D FIXED OI JECT u•P,.OACH TURN 0 PROP("TT OAMAQ( ONl.Y ~ Q',l(RTAl<INQ TUAN ® INJURY ACCIO(l'fT OCJT o, CONTROL. ILC IMPROPE~ L-'NE CHO.HOE IP IMPROPER PASSINO IT IMPROPER TURN INATT INAT'T(NTICN lll/C MOTOIICTCL! @ ·vi. zz. ~ I \ _., (._.,.,- 0. ~ OIICR 11s, RAN src, SIGN OR SIGNAL. • FATAL. ACCIO(NT .. (J() ... \l(HICL.C TURH(O S,ft STOPP(O C" SLOWl"(l rOA O(Q(S TRIAi< \10 \IISIBILITT cRS TRu,:~(0 CO LL! SIU N DI AG p. A \l, lOC AT IQH 'i<.~'NC::.. -..:.-.o / ::.::::)..~~.c,.__ ~~ Q~ I < C::.. a-..6--et-t-..l;. \. . ~\. CITY OP CA RL SBAD OIAWN Ml)~ -~ ,11100 IY TRAFFIC ENGI N~cR ING SECT ION OAfl I·& ? \·\• Bv ..,-0 \Z.· =3 \. ~ NO. ACCIDENTS ~y TYPE TIAI IOUL ,oo ,. OA .. AG I INJUll' 'ATAL llOHT OAU Wll l~B~ s z_ 3 0 """3 z.. z... 0 z..,?-=,-VV':7 17l'? SB \-\<L~'-'N 3-e>-&:<:, \4:~S, \NJvvy @ -FT<:::-1~-z..e, NB RClAo.-< cu..:.A z.-2-\.-:!5~ IS'. C:SZ.. ···p\ .... G>-p ' -C:,o.vv-,, \ 0 £.~-DV\ z~z.z.. 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G FOIi PEQES TRIAN VO VIS IBILtTT ORSTRU.:TEO \IRW Vt0L41(0 RIGHf ~ WAY .,, WRO"G StuE OF H~EE T ---- COLLISIO;l D!Au,.Jr.1 l LOCATION R&:::,,.~'l,>,..O ?'-A-N'T"..A... F.!-Ro. CIT'( O!= CARLSBAD 1-,,:-,--=--.------.-------...-----.------------ 1--0DI"-'::"'-. "-+-;-;--. :-,-~-+----.---+----i'~' 10~ \6? ef \ z.~ I I~ TRAFFIC ENG IN Ef:RING ~ECTION NO. ACC!DENTS SY TYPE JIAI TOTAl ,aor DA MAG I v...J'!:> (8e,,e:,O =,/e::, ,..:>,E,A,-t? ~~ L 1-z...-z...,-0-5 \\00 'E:.~-, ~~Ti" -Z. --Z.."'r Cl ~ I~ z. "'t--\~-0'7 c=.;:>O;ICS> ~~Cio.~"v (E( -Z. ~-z..e, 1-.j I~ ~-==,:11.,,0 -Z\-0? Z. "Z-"°? "c:-"';,~ _v,..;c,,, 4~-,,::; ':::,o/l!!a ?-10>-e-s. ,c:s~o ~\"t:'S"'Wv'\~ ... .. , ,e;o~ ~/~ ou,c; '==-''D~,~ \~'t.-, e..,.1e "2.D"a.D "-°''~ oe,.-,. VEH . MOVINQ AHEAD --+04- VEH. BACKING UP ... () .. ----• PEDESTRIAN ~ TRAIN () r:: c:::::> F'ArlKCD VEHICLE ,,,~~ □ l"IXED OIJECT 0 l'IIOPERTY DAMAGE ONLY ~ ® INJIJIIT ACC10£NT ~ • FATAL. ACCIDENT ~-- I NJUIT B 0 LEGEND HUD•DN HUD• ON S10ESWll't REAR (ND OVfRTUINO SIOESWII'( Rl°"T ANGL( Al'~OACH TURN OV(RTUINO TUAN OUT 0, CONTROi. V[HICL.l TURN[O 0111[11 LICIIIT W II B CONST CONSTRUCTION Z~ oPO DRIVER PHYSICAL DEFECT DV DEFECTIVE VEHICLE ES EXCESS SPHD fTC ,oLLOWING TOO CLOSE 1<110 HAO BEEN ORINKINO H·I! HIT ANO R\JN ILC IMPROPER LAN( CHANGE 11' IMl'ROP£R PASSINO IT IMPROPER TURN IN.ITT INATTENTION 111/C MOTORCTCL[ RSS RAN STOI' SIGN OR SIGNAL s,, STOWCO OR SLOWING FOR P~ot:STR1AIO VO VIS1IIIL1TY OBS TRU.:TED VRW VIO\.AT£0 IIIGIIT or Wfl.Y ws WRONG ~10( OF S TRH T lOCATION ...-{-n1A .J ,~~ LI I \,A Ii H ;I ~~ ~~,b... ~-R.~ CITY OF CARLSB AD TRAFFIC ENGIN Ef:RING SECTION NO. ACC!DENTS BY TYPE TOTAL ,ro, D4MAGI INJUIY \ \ 8 • C),~-\"-\A~-,7~\. ~/~ ~~oeJ~ ~--0 t;°\e~~-,N~ r;-z_~c") '::;:,/~ 'R..'cA,..~~-.;:, \:YO>-Z.O-e4 ,~~ 7. \N-ei-t,v,....,, (#(..)c;c;. ~/~ '°'e.A~D~ • 10--z.,-ea. C>°>\C:, 1::;yv-..,1";;>-€-~ s;,t,e,Oo) "-1/~ ~t,. ~VV. \!:::I \(.:>-D}-eA-\ ~00 ~- VEH . MOVINQ AHEAD -+O+- ((( ► VEH. 8ACKINQ UP ◄ () .. ----• PEDESTRIAN ~ LEGEND HUO·ON HEAO·ON SIOESWll"t RE.t.11 ENO '41Al TRAIN I! C: OVERTAKING SIO(SWll"t c:::> f'AAKEO \IEHICL[ ~~~ Ille.MT ANGL( D FIXED OIJECT Al'l'IIOACH TUAN 0 PROPERTY DAMAGE ONLT ~ OV[RT.t.KINO TURN ® INJUIIY &CC10£NT ~ OUT OF CONTROi. • FATAL ACCIO[NT 6')~ \l[H4CL[ TURN[O O\IU LIONT 7 CONST CONSTRUCT ION ZOH( CPO ORIV[R PHYSICAL DEFECT ov DEFECTIVE VEHICL[ ES EXCESS SPEED ,re FOLLOWING TOO CLOSE .-ao HAO BEEN ORINIUNO H·II HIT ANO RUN ILC IMPROPER LANE CHANGE II' IMPROPER PASSINQ IT IMPROl'CR TURN IN.t.TT INATTENTION M/C MOTORCYCLE IISS IIIIN ST~ SIGN OR SIGNAL SFI' ST~O OR SLOWING FOIi PF.OEST"" \10 V1S181LITY OBSTRIJCT[O \IRW \110\.AT[i) RIGIIT or Wfl.T ws WIIONG 510( o, STREET COLLISION O l AG RA •• CITY OF CARLS BAD TRAFFIC ENGIN=ERING SECTION Tl•I TOT •L L, 6 1---'--' • , ~ t---.... AL-......)C-..'< C ... 1/(H. MOVINQ AHEA0 ((( ► VEH. !IACIC ING UP ----.• PEDESTRIAN . TR.t.lN c=::> PARK(D VEHICLE □ FIX(0 0IJECT 0 PR0P("TY OAMAG[ © INJ\JRT ACClot:l'fT • FATAL ACCIDENT ,,, .... ,, ;... (' 0NLT lOCAt lOJIII 1<.c.~c -::,. _,,c,..__ 'C"" c_ ~L '\--.....,,C-l-4 °t'\<>--\ 'l-.\ ~~. OIAWH IY I NO. ACCIDENTS SY TYPE INJUl'f 0 0 LEGEND ~ HEAO•ON ... \' ... HEAD·ON ,10ESWIPE --.-0--REAR ENO I !-° OVERTAKING SID(SWIPI!: Al'PROACH TURN OV(IHAKINQ TUAN OUT o, CONTROL VEHICL[ TURNED 0\IE" I IOMT CONST OPO CV ES fTC t<90 H• R ILC IP IT INATT W/C "s, SFI' VO Pl llOD OA. llt Q CONSTRUCTION ZONE DRl\l(R P><TSIC.AL 0E!'(CT OEF(CTIV( VO11CI.! EXCts, SPUD FOi.LOWiNG TOO CLOS( HAO BEEN ORINKINQ HIT ANO "UN IMPROP(~ LANE CHANG( IWPR0P(~ PASSINO IWPRQP(" TURN INATl(NTICN MO TOf'CTCt..t RAN STCP Sl (;N OR Sl(;NAI. STOPP(O c~ 51..C•ING rOR VISIBILITT :;ASTRU~~(0 ~ •(C(ST RIAN COLLISION DIAGRf \, CITY 0~ CA RLSBA D TR .AF FIC ENG IN=ER ING SECT ION o....... /I I-. c.--•-/JC-. ,u100 If :'A...' I .,, /. & ·o / PTT/ / NO. ACCIDENTS SY TYPE TIAI TOTA l INJUIT IIOKT OA.ll WI T -z__ \ I 0 \ \ <l ~ ;~ ~ '1 J, 1 L e:,_, c::..~""=>..,-C,.. '-~ (j"~ f' '\ ~ I' --- ~ \j\ 1 ~ -1 ~ I ti (' I > ~ £~-l~\4i"r" '::A lc?-0 ) . -:i31-e& 1~:w ~ 1, ,. ,j ,J ; 1J -r{ LEGEND CONST CONSTRUCTION !ONE ~ CPO DRIVER ~TSIC~L DETECT ... VEH. MOVING AHEAO HCAO•OH ov OCT'ECTIVE VEHICL! ((( ... VEN. 5ACl<ING u,, ◄ HEAO·OH SIDESWIPE ES EXCESS S?HO \ I .. ----.• PEDESTRIAN ~ REAR END nc F'OLLOWl"G TOO CLOSE 1 -HBO HAO B((N ORINIIINQ TRAIN OVERTAIIINQ S1D(SWIP! H•R HIT ANO 'i\JN -c::::> PAAK(O V(HICL[ .. ~ RIGHT AHGL( ILC lt.lPROP(q LANE CHANGE □ F'IX(O OI JECT At'PROACH TURN IP IMPROPER PASS ING 0 ~~ IT IMPROPER TURN PROPERTY CAW.AGE ONLY 0\/(RT.U(IHQ TUAN IHATT INATTENTION © INJURY ACCl0£NT ~ O'JT o, CONTROL lll/C UOTOl'CYCLE • FATAL ACCIDENT -Du-\l(HICL[ TURNED OVE" RSS IUN STC,-SIGN OR SIG"AL SFIO STOPPED c~ SLCWIHG Fell' DEOESTR1u• VO \II SI BILI TT :RSTRU~T(O """" v1n1 a Trn :::ll r"YT' ,.,. -·· liULLli)IUll \ C c:,-~c......,_,::...-"":::.-c:...·--.:.:·'.:".o-. ~~2:>--.2..""-"''-":: S--:-:- CITY 0~ CARLSBAD -r-----,-:-----------~ ~-,./J'? ,u100 .. TR AFFI C ENGJN~ER !N G SECT ION DATI l•b ·f3? TIAI ... ( (( ► ----• ~ D 0 ® • NO. ACCIDENTS TYPE TOT AL ,10 ,. 0AMAGI I H JUIY 0 V~"'-" • \ 1'\~"i\ D tu4 -.6(1 I · C:. • BG:, o"?SO' y VEH. MOVING AHEAD VEH. SACKING VP PEDESTRIAN TRAIN PAR KEO VEHICLE FIXED OI JECT PROPERTY DAMAGE INJURY ACCIO(NT FATAL ACCIDENT ONLY LEGE ND ~ HEAO•ON HEAO • ON SIDESWIPE --.0---REAR ENO I ia, OVERTAKING SIO(SWIP( RIGHT ANGLE Al'PROACH TURN OVERTAK ING TURPII OUT OF CONTROL VE HICLt TURNED OVE,. IIOHT WIT \\ \ \ CONST CONS TRUCTION ZONE Of'O ORIVER PHYSICAL OEfECT ov DEfECTIVE V(HICL! ES EXCESS SPEED FTC FOLLOWING TOO CLOSE t-<BO HAO BEEN DRINKING H·R HIT ANO ll\JN ~ ILC IMP ROPE~ LANE CH ANGE IP IMPROPER PASS INO IT IMPRQPEII TURN !NATT INATTENTION 111/C UOTORCTC L( RS! RAN STCP SIGN 011 SIGNAL SFf' STOPPED 0~ ~OWING rOA "ED(STRIAN VO VISIBILITY •cRSTRUC~E O VRW VIOLA TEO qlGHT 0, #AY ..,. ..,gn wr. -t,r.r n r . .,.,, ... ,. COLLISIO N OIAGR: ,~ CITY OF CARLS BA D TRAFFIC ENG IN ::E RIN G SECT ION LO CAJ IOH OI AWN IT 01.r1 ~ ----a..-.... :._. ~ i<c..."'c.~c NO. ACCIDENTS £:.Y TY PE TIAI IOTAl ,10,. 0A MAG I I flit JU I Y 'ATA L llOMT ~ \ 0 \ 0 . /lj ~ Cl I' I ~ ' _, VRvv-I\...JA.-n-S,7 G. \ 1K' /-Io-2,(o \3: ~ 6 j ~ {\ LEGEND CONST CONSTIIUCTION ZONE Of'O ORIVER P><YSICAl. OEf(CT ... VE!-1. lilOYINQ AHEAO ~ HEAO•ON ov OEfECTIVE V(HICl.E ( (( ... V(H. 8ACl(ING UP ◄ H(AO•ON ,10ESWIPE ES EXCES, SPUD ... ---• PEDESTRIAN -.-0--REAA (NO FTC FOl.l.D'IIING TOO Cl.CSE -H80 HAO BEEN ORIN KING TRAIN 1 OVERTAKING SIO(SWIPI!: -H-~ HIT ANO "IJN c:::::> PAR KEO V(HICl.( ~~~ IIIGHT .\HGl.( ll.C IWPAOP(R LANE CHANG( D FIXEO OIJECT At'P"O.\CH TUAN IP IWPROPER PASSING IT IMPRQP(~ TURN 0 PROPEIITT OAMAG( ONl.T ~ OVERTAKING TUAN IN.\TT IN.\TT[NTIO>I ~ ® INJ\JRT .\CCl0£N1' ~ OUT o, CONTROi. 111/C IAOTOflCYCl.E • 61)-V(HICl.[ TUANEO OV[,. 1155 114N STCP SIGN 011 SIGNAl. f.\TAl. ACCIO(NT -Sf P STOPP(O 0 ~ Sl,.0WIHG FOR VO Vl5181l.1Tl CRSTRU~~(O ··-··-. ---· -. --.. . . . . WI! - 0EDESTl>IA,.. 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(btwn/at) C::-.,,qd<,y~/-4 (and ) k Yc<".:i?P-,/~e<'A.I Day/Direction Time Period ~,B -rH Ae5 1/=a 0000-0100 3 0 30 0100-0200 Z-0 ZZ- 0200-0300 8 \ \ 0300-0400 lZ-I S 0400-0500 10 Z.\ 0500-0600 07~ 9'-+ 0600-0700 4'-+ q 4Z-S 0700-0800 &Ll-3 &&4 0800-0900 &14 S~l 0900-1000 4 "30 4S6 1000-1100 443 L\-O Z- 1100-1200 q..00 40 6:> 1200-1300 C\-l ~ 413 1300-1400 3tS? 449 1400-1500 0 77 ""?3 S 1500-1600 Ct?ID S79 1600 -17 00 CPCP7 CP/q l 700-1800 u c;?::> (oO\ 4 O(p : 1800-1900 '387 I 1900-2000 Z.4S' 2-Z...3 I 2000-2100 \6 g 9S I 2100-2200 \06 \ 0::::, I 2200-2300 \0) to4 2300-2400 L\-3 S7 TO TAL (S) z ) Li-Sf; 7,&73 S.l23 PEAK HOUR (S) I PEAK FLOW (S) I i Special conditions or remarks : _____________ -=------- V"2::..~. / -z_ ~c,...y ~>< l~-==-15 ) Z SL+- TRA FFIC COCN1 JATA SHEET TS# __ _ Count Date /-ZJ!j?to / Z3 6? Location : On i<(61-;?d. Time Period ~8 -r-;.~ /VB 0000-0100 Z-"7 0100-0200 I~ 0200-0300 \0 0300-0400 I '-t- 0400-0500 Z-3 0500-0600 "7f:;> 0600-0700 ::,Cl G:, 0700-0800 &1 9 0800-0900 '? '-+ (.,, 0900-1000 L+-30 1000-1100 3'9~ 1100-1200 41"3 1200-1300 4Lf6 1300-1400 '-1 ss 1400-1500 43~ <-4:B4 1500-1600 u,40 &1S 1600-1700 &7 7 &60 1700-1800 Cf'7@ 0 7 Cf 1800-1900 :,;2-:, ~'9 1900-2000 zo-4 z o-z_ 2000-2100 /-Sg 179 2100-2200 I Z S I S i 2200-2300 q6 / -z._ 2 300-2400 3 C/ 04 TOTAL(S) 3, 3ZS 7, 2:;,0 PEAK HOUR(S) PEAK FL0W(S) I Dat a Reduction by/'-/_/"=:;, Dat e z_ q 67 (btwn/at) CAd&-vC:../6, (and ) LA C:::.c:;,"':=,rA Day/Direction ~B Z-~ ~ ; I ~ -z._ & 7'? 39-z.._ &OS, 02-z, q z...z.._ 3g,z_ L-t:3?+ 4zg L.\b,S I i i I I I I I I '3,e:,1 z_ I ' I I Special conditions or remarks : _______ -=---------;------:--- VC-/-1. / Z -z;?,,-1'-../ ~Y1od -I 4, 3~ 7 TRAFFIC COC ,ATA SHEET 1..,..; __ _ Street(s) Count Date / Z-l&7 to /-Z-3 87 Data Reduction by/tfJS, Date z. • q . ~7 Location : On ~P?-IYC-:t-4: 5:.-r. (btwn/at) K':::>P ,.2.d . (and ) &!=>EC:<A ':> Day/Direction Time Period (A./ /4e, rH/4B F/48 0000-0100 -z_. --z_.. 0100-0200 0 -z_ 0200-0300 0 0 0300-0400 0 ) 0400-0500 0 0 0500-0600 g Lr 0600-0700 2--z_ 7 0700-0800 40 "30 0800-0900 &6 &1 0900-1000 l.t-/ 40 1000-1100 I '9 4 0 1100-1200 ""3 0 Lf-3 1200-1300 32-c..+C I 1300-1400 ~~ 3 1 1400-1500 ~l ""3 b, 1500-1600 3? c:; \ I 16 00 -1700 ?0 4 0 1700-1800 3'4 "3t,,, 1800-1900 30 3 \ i 1900-2000 24 33 I I 2000-2100 ZO I z_ I 2100-2200 ~ I I I 2200-2300 /0 s ! 2300-2400 "3 0 l TOTAL (S) 16"7 s+~ 4 0Z I I I PEAK HOUR (S) I ., PEAK FLOW(S) I I I Spec i al conditi ons or remarks : ___________ -:---------- / z_ ~c,.y ~~ ,d. =: ,--: /0 S Traffic Manual TRAFFIC SIGNALS AND LIGHTING 9-1 12-1979 CHAPTER 9 TRAFFIC SIGNALS AND LIGHTING Traffic Signals-Basic Information and Warrants 9--01 9--01.1 Introduction Traffic signals are electrically powered traffic con- trol devices which alternately direct traffic to stop and proceed at highway and street intersections. Their purpose is the orderly assignment of right of way to the various traffic movements. ~hen jus~ified and properly designed, a traffic sig- nal installation may achieve one or more of the fol- lowing: l. Reduce the frequency of certain types of acci- dents; especially the right-angle type; 2. Effect orderly traffic movement; 3. By proper coordination, the continuous flow of a . platoon of traffic at a definite speed along a given route; 4. Allow other vehicles and pedestrians to cross a heavy traffic stream; and 5. Control traffic more economically than by man- ual methods. Unjustified, ill-<lesigned, improperly-operated, or poorly maintained traffic signals may cause: l. Increased accident frequency, 2. Excessive delay, 3. Disregard of signal indications, and 4. Circuitous travel by alternate routes. Contrary to common belief, traffic signals do not always increase safety and reduce delay. Experience shows that the number of right-angle collisions may decrease after the installation of signals, but the num- ber of rear-end collisions will increase in many in- stances. The installation of signals may increase over- all delay and reduce intersection capacity. Consequently, it is of the utmost importance that the consideration of a signal installation and the selection of e9uipment be preceded by a thorough study of traffic and roadway conditions made by an engineer expe_rienced and trained in this field. Equally impor- tant 1s the need fo r checking the efficiency of a traffic sigt:al in operation. This determines the degree to which the type of installation and the timing pro- gram meets the requirements of traffic. 9--01.2 Warrants The warrants for the installation of traffic signals are based on those stated in the Manual on Uniform Traffic Control Devices. These warrants apply to both pre-timed and traffic-actuated traffic signals. When the 85-percentile speed of major street traf- fic exceeds 40 miles per hour, or when the intersec- tion lies within the built-up area of an isolated com- munity having a population less than 10,000, the location is considered rural. All other· areas are con- sidered urban. Since the installation of traffic signals may increase certain types of collisions, the decision to install signals should not be based solely upon war- rants. Consideration should also be given to sue:h fac- tors as delay, congestion, approach conditions, driver confusion and additional evidence of need for right of way assignment above that which could be pro- vided by stop signs. The installation of traffic signals should be consid- ered if one or more of the warrants listed below are met: Warrant 1-Minimum Vehicular Volume. Warrant 2 -Interruption of Continuous Traffic. Warrant 3 -Minimum Pedestrian Volume. Warrant 4 -School Crossings. Warrant 5 -Progressive Movement. Warrant 6 -Accident Experience. Warrant 7 -Systems. Warrant 8 -Combination of Warrants. 9--01.3 Warrant 1 -M inimum Vehicular Volume The minimum vehicular volume warrant is intend- ed for application where the volume of intersecting traffic is the principal reason for consideration of sig- nal installation. The warrant is satisfied when for each of any 8 hours of an average day the traffic vo lumes given in the table below exist on the major street and on the higher-volume minor street ap- proach to the intersection. ~umbc:r of Ian~" for moving traffic on each approa(h Veh1cks per hour on maior street ( tota I of both approaches) Vehicles per hour on h1gher- ,olume minor- ~trc~t appro ac~ (one d1rcc t1on ,,nly) (\11n1mum Requiremen ts) !\lajor Street \l inor Strc:et Urhan Rural Crban Rural I ------· I -------500 350 150 105 2 or more --I _.,. _____ 600 420 ISO 105 2 or more - -2 or more --600 420 200 140 I ---·---:!or more--500 350 200 140 9-2 TRAFFIC SIGNALS AND LIGHTING Traffic Manual 12-1979 The major street and the minor street volumes are for the same 8 hours. During those 8 hours the direc- tion of higher volume on the minor street may be on one approach during some hours and on the opposite approach during other hours. Left turn movements from the major street may be included with minor street volumes if a separate signal phase is to be provided for the left turn move- ment. The left turn volume in the highest direction may be added to the minor street volume on the highest approach and the major street volume should be reduced by this amount. 9-41.4 Warrant 2-Interruption of Continuous Traffic The interruption of continuous traffic warrant ap- plies to operatL"lg conditions where the traffic vol- ume on a major street is so heavy that traffic on a minor intersecting street suffers excessive delay or hazard in entering or crossing the major street. The warrant is satisfied when for each of any 8 hours of an average day the traffic volumes given in the table below exist on the major street and on the higher- volume minor street approach to the intersection, and the signal installation will not seriously disrupt progressive traffic flow. Number of lanes for moving traffic on each approach Vehicles per hour on major street (total of both approaches) Vehicles per hour on higher- volume minor- street approach (one direction only) (Minimum Requirements) Major Street Minor Street ~ Rural Urban ~ 1-------1-------750 525 75 53 2 or more --1-------900 630 75 53 2 or more -· 2 or more •• 900 630 100 70 1-------2 or more --750 525 100 70 The major street and minor street volumes are for the same 8 hours. During those 8 hours the direction of higher volume on the minor street may be on one approach during some hours and on the opposite approach during other hours. Left turn movements from the major street may be included with minor street volumes if a separate signal phase is to be provided for left turn move- ment. The left tum volume in the highest direction may be added to the minor street volume on the highest approach and the major street volume should be reduced by this amount. Ml.5 Warrant 3 -Minimum Pedestrian Volume The minimum pedestrian volume warrant is satis- fied when for each of any 8 hours of an average day the following traffic volumes exist: 1. On the major street ~Urban, 420-Rural or more vehicles per hour enter the intersection (total of both approaches): or 1,000-Urban, 700 -Rural or more vehicles per hour ( total of both approaches) enter the intersection on the ma- jor street wl-iere there is a raised median island four feet or more in width; and 2. During the same 8 hours as in paragraph 1., there are 150-Urban, !~Rural or more pede- strians per hour on the highest volume cross- walk crossing the major street. A signal installed under this warrant at an isolated intersection should be of the traffic-actuated type with push buttons for pedestrians crossing the main street. If such a signal is installed at an intersection within a signal system, it should be equipped and operated to provide proper coordination. Signals installed according to this warrant shall be equipped with pedestrian indications conforming to requirements set forth in other sections of this Man- ual. Signals may be installed at nonintersection loca- tions (Mid-block) provided the requirements of this warrant are met, and provided that the related cross- walk is not closer than 150 feet to another established crosswalk. Curbside parking should be prohibited for a minimum of 100 feet in advance of and 20 feet beyond the crosswalk. Phasing, coordination and in- stallation must conform to standards set forth in this Manual. Special attention should be given to the sig- nal head placement and the signs and markings used at nonintersection locations to be sure drivers are aware of this special application. 9-01.6 Warrant 4 -School Cro11in91 See Chapter 10. 9-01.7 Warrant 5-Pro9re11lve Movement The progressive movement warrant is satisfied when one of the following is true: l. On a one-way street or on a street which pre- ponderantly has unidirectional traffic signifi- cance, adjacent signals are so far apart that the necessary degree of platooning and speed con- trol of vehicles would otherwise be lost or, 2. On a two-way street, where adjacent signals do not provide the necessary degree of platooning and speed control and the proposed and adja- cent signals could constitute a progressive signal system. The installation of a signal according to this war- rant should be based on the ~percentile speed un- less an engineering study indicates that another speed is more desirable. The installation of a signal according to this war- Traffic Manual TRAFFIC SIGNALS AND LIGHTING 9-3 rant should not be considered where the resultant signal spacing would be less than 1,000 feet. 9-01.1 Warrant 6-Accident Experience The accident-experience warrant is satisfied when: 1. Adequate trial of less restrictive remedies with satisfactory observance and enforcement has failed to reduce the accident frequency; and 2. Five or more reported accidents of types sus- ceptible of correction by traffic signal control have occurred within a 12-month period, each accident involving personal -injury or property damage to an apparent extent of $200 or more; and 3. There exists a volume of vehicular and pedes- trian traffic not less than 80 percent of the re- quirements specified in the minimum vehicular -volume warrant, the interruption of continu- ous traffic warrant, or the minimum pedestrian -volume warrant; and 4. The signal installation will not seriously disrupt progressive traffic flow. 9-01.9 Warrant 7 -Systems Warrant A traffic signal installation at some intersections may be warranted to encourage concentration and organization of traffic flow networks. The systems warrant is applicable when the common intersection of two or more major routes has a total existing, or immediately projected, entering volume of at least 800 vehicles during the peak hour of a typical week- 12-1979 day, or each of any five hours of a Saturday and;or Sunday. A major route as used in the above warrant has one or more of the following characteristics: 1. It is part of the street or highway system that serves as the principal network for through traf- fic flow; 2. It connects areas of principal traffic generation; 3. It includes rural or suburban highways outside of, entering or traversing a city; 4. It has surface street freeway or expressway ramp terminals; 5. It appears as a major route on an official plan such as a major street plan in an urban area traffic and transportation study. 9-01.10 Warrant 1-Combination of Warrants In exceptional cases, signals occasionally may be justified where no single warrant is satisfied but where any two of Warrants 1, 2 and 3 are satisfied to the extent of 80 percent or more of the stated numer- ical values for each of any 8 hours of an average day. 9-01.11 Periodic Traffic Signal Studies To maintain the desirable operation of existing traffic signals, it is necessary to periodically conduct engineering studies to ensure that t~e des~red ope~a- tion is realized. In particular, engmeenng studies should determine whether the installation continues to be justified and that the signal timing in use meets the current traffic requirements.