HomeMy WebLinkAbout2019-06-07; Level of Service on Street Segments Discussion at Traffic Safety Commission Meeting June 3, 2019; Gomez, PazTo the members of the:
CITY COUNCIL
Date 11/1 / 1 e:,-CA \/ CC \/ cM_Foo__✓ocM{3) v
June 7, 2019
Council Memorandum
To:
From:
Honorable Mayor Hall and Members of the City Council
Paz Gomez, Deputy City Manager, Public Works )),--
Elaine Lu key, Chief Operations Officer ~· Via:
{city of
Carlsbad
Memo ID# 2019062
Re: Level of Service on Street Segments Discussion at Traffic Safety Commission
Meeting June 3, 2019
This memorandum provides information on a discussion at the Traffic Safety Commission (TSC)
meeting on June 3, 2019, regarding Level of Service (LOS) on street segments.
Background
The primary objectives of the Growth Management Plan (GMP) are to ensure that adequate
public facilities are provided concurrent with growth, and to assure compliance with the
ultimate dwelling unit limitations that were established by Proposition E, which was passed by
the voters in 1986. The performance standards that are reviewed and evaluated include the
LOS of the city's circulation system, which is addressed in this memorandum.
Discussion
The TSC requested a presentation from staff regarding LOS in the city. At the TSC meeting held
on June 3, 2019, staff presented background information, standards and definitions for the
Commissioners and the public (see attached PowerPoint slides). Slide 27 references the GMP
annual report and street segments LOS.
Next Steps
Community & Economic Development staff has prepared the annual report to provjde
information regarding the status of the Carlsbad GMP for the fiscal year covering July 1, 2017,
to June 30, 2018, and to verify that the plan is continuing to accomplish its stated objectives.
This annual report will be distributed to City Council in the next few weeks.
At the City Council Meeting on July 9, 2019, Transportation Department staff will provide 1) a
presentation on LOS standards and methodologies, and 2) a report to address the circulation
facility evaluation and any required corrective actions.
Attachment: Level of Service presentation, June 3, 2019, TSC meeting
cc: Scott Chadwick, City Manager
Celia Brewer, City Attorney
Gary Barberio, Deputy City Manager, Community Services
Debbie Fountain, Community & Economic Development Director
Marshall Plantz, Transportation Director
Public Works Branch
Faraday Center 1635 Faraday Avenue I Carlsbad, CA 92008 I 760-602-2730
Level of Service (LOS)
By: Doug Bilse, T.E.
Senior Engineer
The Highway Capacity Manual (HCMJ
• Industry standard for establishing level of service
{LOS) evaluation methods and performance
measures
• General Plan Mobility Element requires traffic
evaluations to be consistent with HCM
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HCM Commonly Evaluates Traffic Conditions Using Two
Different Performance Measures
,., Level of Service (LOS): a ualitative
evaluation of a driver's experience
,[) Capacity: a uantitative evaluation of the
road's ability to meet anticipated traffic
LOS Basics
• Typically based on weekday traffic conditions
• Peak hours: AM/PM commute hours
• Letter Grades: A-F (G and H reflect LOS F duration)
• Carlsbad standard is LOS D
-LOS E/F are deficient
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Flow
Free Flow
B Stable Flow
C Stable Flow
D Approaching
Unstable Flow
E Unstable Flow
F Forced Flow
Remarks
Drivers can maintain desired speed with little delay
Drivers can maneuver easily, but begin to be restricted in choosing speed due to delay
Speed and maneuverability closely controlled due to an acceptable delay
Operating conditions are controlled by higher volumes resu lting in tolerable delay
Lower operating speeds and possible stop-and-go conditions for short periods as
traffic approaches capacity with tolerable delay
Speeds and volume can drop to zero as queues back up from downstream restrictions
Levels of Analysis
• Operational Analysis
-High level of detail
-few default values
-Precise
• Design Analysis
-Useful for needs assessment
• Planning and Preliminary Design Analysis
-May default parameters
-Useful for monitoring
-Accurate
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LOS is Based on the Peak Hour:
Daily to Peak Hour Factors
Using Default Parameters
• Use field data as much as possible
• Sometimes data isn't avaialble
• Sometimes gathering data is expensive
• Sometimes it's not possible to collect data
4
Roadway
Segme~t LOS
Roadway
Segment LOS
Stop line
Deceleration
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Acceleration
5
Roadway Segment LOS Analysis
• Accurate, but not precise
• Based on vehicle speed
• Includes signal timing delay
• Recommended when signalized intersections are
spaced less than 2 miles apart.
Simple Data: Low Cost and Easy to Gather
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13
ROADWAY CAPACllY TABLES
Table 1: Roadway Capacity Table • Specific Corridors
N S Streets
El Ca mino Real
Limits
(i:ty Limits to Marror> Ro.ad
Marron Road to Carl sbad Village Drive
Carlsbad Village Ori veto Tamarack Avenue
Tamarack Avenue to Cannon Road
Cannc,n Roa cl to College Boulevard
Cc,Jlege Boulevard to Palomar Airport Road
Palomar Airport Road to Cami.no \C,da Roble ·
Camino Vida Roble to Poinsettia lane ·
Poinsettia lane to Aviara f'arkway-Alga Road
A'\o·iara Parkway-Alga Road to L.:t(,osta Avenll1e
La Costa Avenue to l-eucadia Boulevard
' ' Intersection :
' LOS '
Roadway
Classification A
6/35/D ..
6/35/D
6/55/D 1.!HO
6/55/D
2/55/D-NB ..
3/55/0-SB
6/55/0
6/55/D
i /SS/0-NB
3/55/0-SB ..
6/55/D :t--•
3/55/D-NB ---2/55/D-SB ...
6/55/0
Acceleration
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Peak Direction
8 C D E
.•• 1~00
140 2070 2520 I/ff
2850 2900 fflf It#
2400 2800 It#
1060 1860 fflf It#
1470 #It .. 210(1 2820 2900
1390 2580 #ff 1#1
800 1920 Ill! 1#1
1880 2820 2880
7
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---11►► Vehicle Movemenls
Pedestrian Moven,ents
8
Intersection LOS Analysis
• Does not include delay traveling between
intersections
• 2 methods:
-Intersection Capacity Utilization (ICU)
-HCM
ICU vs. HCM
• ICU:
-Good for planning purposes (accurate}
-Independent of timing plan
-Uses volume to evaluate how close to capacity
• HCM
-Good for operations (precise}
-Evaluates timing plan
-Uses delay estimates to reflect driver experience
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PHAS~
OIAORAM
(SOiHRUmS>
RING·
O.ARRl!iA
OIAGRAM
9
·~ --j
~
~
+----► ~ J ••
• :.a.-:~ $
-~ ~ ~.
■ (I.
HCM Method: Webster's Equation
d1 = Average Delay per vehicle due t6 uniform arlivals (sec)
d2 = Average Delay per vehicle due to random arrivals (sec)
d3 = Average delay per vehicle due to initial queue at start of analysis time period (sec)
PF= Progression Adjustment Factor
0.5~(1-if
d1 ;;:o ------
l -[ min (1, X) ty ] d2 = 900T [ (X -1) +
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Capacity
• maximum mid-block traffic flow without
consideration of the impact of the downstream
traffic sign a I.
• used to determine if the roadway facility has an
adequate number of through lanes
• Not intended for LOS of a signalized arterial
Freeway/Highway LOS: Capacity Ratio (v/c)
t ,,,
Q)
& C !I)
en C: D .:: I!
Q) E Cl. Q
F
Volume/Capacity Ratio -eo-
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cS_ptimal flow
or
capacity,qmax
D
Density (k)
Laguna Seca Golf Ranch 4'
250 ..,J) @ 800
1,300
~Mean free flow speed, lJi
Optimal speed, u0
@
Cougested
flow
1,200 h
· 200 'l',,
@/
100 D
Corral
De Tierr(l
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San Berwncio
13
What's Next?
• Growth Management Monitoring Report will reflect
LOS based on Service Volume Table
• Staff is studying ways to gather data automatically
as part of adaptive signal project
• Adaptive signal controllers can collect data to
better capture progression adjustment factor (PF}
• Changes will be made and documented as
necessary based on feedback
Commissioner Linke's Comparative Table
0 200 400 600 BOO 1000 1200 1400 1600 1800
Carlsbad TMP method D 1,620
HCM Class II (Linke 2011) 840
Melrose NB 685 (City Limit to PAR)
General 4-lane 780 45 MPH divided
College 840 (City Limit to CVD) I l I
El Camino Real L I I 940
(Poinsettia to~
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Commissioner Linke's Comparative Table
. , .. '•·· . rcon't) · · ,·•:-·-..
ll ■, summer 2015111
Stgm1nt Segment Loc::atlon ADT Pe.ik
LOSi?l
Pa!Omar A!rpOf1 Rel. Paseo Del Norte to AmlaOa Of 55,501 A D
P.llomar A!rp0l1 Rd. Yarrow Or. to El c.,mno Real 35,433 A E
P.a!omarAlrportRd. El Cm1tno Re.ii to Loker Ave (W.) ~~.J45 A C
Pa.10m.-Aupor1 Rd. f.\!.-'.rosc Or to Pasco Vallodo 30.912 A C
8C...mn0Rea1 Plaza Or to ~.\Jiron Rd 30.056 A
8 C:mino Rc,11 TiVMrack A~ to Kety [)', 27,150 A C
El c..,m:no Real Jadr.sp;)f Or lo College Blvd 37,5-11 B
8 CanmoReal Faraday Ave lo Palom.lr Airport Rd 34,378 A B
El Cims10Real AJ'enJ.I Rd lo Cosla Del t.\ar Rd 51.499 B F
· 10 El C.,minoReal Levanle SI. to Calle Barcelona 37,873 A C
11 Melrose Or. Uooshead Ave. to PaJOm.11 AlrJ)Ol1 Rd 30.378 A E
12 Cmlsb.:tdBIVd $1.a:e St. to t.\cu1lam View Or. 12.991 A E
13 C<lrfsb.ldBNd Acacia A\-e. lo Ctieny Ave 18,011 A D
" Cilrlsboo BIVd Tamarack Ave. to Tierra Def Om 20.B!>-I A D
15 Gailsbad Blvd Cannon Rd. to ee,ei:o Dr. 16,668 A F
16 Cartsbad BIVd Break.waler Rd. to Porn!'tellla Lrl 16.539 A D
17 C.Jr1sbadBNd AVfflida Encinas lo Ll Costa Ave. 19.167 A D
18 U C0Sl3AVC Piraeus s1 to saxony Ra. 38 • .S IS A C
19 La Costa Ave Romerta SL 10 Cooencla SI. 12.861 A D
20 Rancho S.lllt.t Fe Rd La Costa Me.JOOW'S Dr. lo San ERJo Rd. 29,512 A 8
21 Po.nsen,a Ln Paseo Del Nolte to Ba\iq\Jitos or. 26,17.S A C
22 Tomarack Ave El COmno Real lo L3 P<l<tal>da Ot. 7.390 A C
23 Cannon Rd. P.1seo Del Norte 10 car countty or. 24,702 A C
24 G.lnoon Rd Hilltop Sl lo College Blvd. 18.814 A
25 COIJege Blvd. N. City Umits lo Tam.1rack Ave,. {N.J 26.830 A D
2G eonege Btvtl Aston Ave. to PalOmclr A!rport Rd. 14.762 A C
27 Alga RO Conntia St to El Fue<te St. 10.538 A C
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