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Home My WebLink About2011-09-12; Traffic Safety Commission; ; Investigate the need to establish an ALL-WAY STOP at the intersection of Glasgow Drive and Middleton Drive--- CITY OF CARLSBAD TRAFFIC SAFETY COMMISSION STAFF REPORT COMMISSION MEETING OF: September 12, 2011 LOCATION: INITIATED BY: Intersection of Glasgow Drive and Middleton Drive Julann Lodge ITEMNO.6A REQUESTED ACTION: Investigate the need to establish an ALL-WAY STOP at the intersection of Glasgow Drive and Middleton Drive. BACKGROUND: The subject intersection serves the adjacent residential neighborhoods and Calavera Conununity Park, whose entry/exit driveway is the west leg of the Glasgow Drive/Middleton Drive intersection (see Exhibit I). During sporting events and concerts at the park, this intersection can be congested with pedestrians, and vehicles. Residents on the east side of Glasgow Drive, and event attendees parking on the east side of Glasgow Drive must cross Glasgow Drive as pedestrians going to and from the events. DATA: Glasgow Drive and Middleton Drive are unclassified in the Circulation Element of the General Plan but function as local streets. Glasgow Drive features curb and gutter, sidewalk and street lights on both sides of the street. It has a curb-to-curb width of 40 feet with a single travel lane in each direction, separated by a painted double yellow centerline. On-street parking is allowed on both sides of Glasgow Drive. Middleton Drive features curb and gutter, and sidewalk on the south side but no sidewalk and street lights only on the north side of the street. Middleton Drive has a curb-to-curb width of32 feet, and is not striped. On-street parking is allowed on the south side of Middleton Drive, but prohibited on the north side. Traffic control on Glasgow Drive is provided by a traffic signal at the intersection of Carlsbad Village Drive and Glasgow Drive and STOP signs on Glasgow Drive at Edinburgh Drive. Pedestrians on Middleton Drive and the east side of Glasgow Drive wanting to access Calavera Community Park at a controlled crossing must travel 875 feet to the traffic signal at Carlsbad Village Drive or 1200 feet to the STOP sign at Edinburgh Drive. The only other pedestrian crossing options across Glasgow Drive are the uncontrolled but legal pedestrian crossings at Artesian Way, Esker Way and Woodstock Street. There have been no reported collisions at the subject intersection for the past three years. As part of this request, staff conducted an analysis to establish an ALL-WAY STOP at the subject intersection. The analysis is based on Section 2B.07 of the California Manual on Uniform Traffic Control Devices (MUTCD) which specifies the consideration of minimum traffic volumes, accident history, vehicle/pedestrian conflicts, sight distance restrictions and other criteria to determine whether or not an ALL-WAY STOP is justified at a particular location. A 24-hour approach count was conducted on August 3, 2011, the results of which are shown on Table I. Page I CITY OF CARLSBAD TRAFFIC SAFETY COMMISSION STAFF REPORT COMMISSION MEETING OF: ( continued) September 12, 201 1 ITEMNO.6A Table 1: 24-Hour Traffic Count Summary at Glasgow Drive and Middleton Drive Glaseow Drive Middleton Drive Total Time Northbound Southbound Subtotal Eastbound Westbound Subtotal Volume 0000-0100 5 16 21 I 13 14 35 0I00-0200 2 3 5 0 2 2 7 0200-0300 3 6 9 0 2 2 11 0300-0400 I 2 3 0 2 2 5 0400-0500 4 I 5 0 I I 6 0500-0600 4 3 7 0 9 9 16 0600-0700 24 19 43 7 13 20 63 0700-0800 39 37 76 10 26 36 112 0800-0900 46 38 84 22 24 46 130 0900-1000 49 71 120 58 28 86 206 I000-1 IO0 43 75 118 25 21 46 164 1100-1200 47 70 117 30 19 49 166 1200-1300 51 120 171 76 17 93 264 1300-1400 38 )05 143 41 20 61 204 1400-1500 49 71 120 36 13 49 169 1500-1600 48 87 135 55 16 71 206 1600-1700 64 129 193 63 28 91 284 1700-1800 54 124 178 42 23 65 243 1800-1900 48 145 193 51 30 81 274 1900-2000 47 I08 155 136 28 164 319 2000-2100 21 73 94 72 23 95 189 2I00-2200 17 51 68 42 20 62 130 2200-2300 23 37 60 6 4 10 70 2300-2400 15 20 35 7 4 II 46 Totals 742 1411 2153 780 386 1166 3319 The intersection of Glasgow Drive and Middleton Drive did not meet the California MUTCD criteria based on minimum traffic volumes or collision history. Staff conducted field measurements of the existing sight distance conditions at the subject intersection. The posted speed limit on Glasgow Drive is 30 miles per hour and the minimum stopping siffiht distance required for 30 miles per hour is 200 feet. However, the critical speed (85 percentile) speed on Glasgow Drive is 34 miles per hour. The minimum stopping sight distance required for 35 miles per hour is 250 feet. The results of the sight distance evaluation conducted by staff are shown in Table 2 and Exhibit 2 and consider the minimum stopping sight distance requirements for 30 and 35 miles per hour. Table 2: Sight Distance Evaluation at Glasgow Drive and Middleton Drive Measured Minimum Meets 30 Minimum Meets 35 Location Sight Distance SSD for 30 MPH SSD for 35 MPH MPH SSD? MPH SSD? Park Dwv., looking North 172' 200' NO 250' NO Park Dwv., looking South 244' 200' YES 250' NO Middleton Drive, looking North 457' 200' YES 250' YES Middleton Drive, lookine South 450' 200' YES 250' YES Page2 - CITY OF CARLSBAD TRAFFIC SAFETY COMMISSION STAFF REPORT COMMISSION MEETING OF: (continued) September 12, 2011 ITEMNO.6A The sight distance limitations from the park driveway are due to the fact that the park driveway is located on the inside of the horizontal curve on Glasgow Drive. Figure 1: Sight distance from park driveway looking to the north I Figure 2: Sight distance from park driveway looking to the south Page 3 """" CITY OF CARLSBAD TRAFFIC SAFETY COMMISSION STAFF REPORT COMMISSION MEETING OF: ( continued) September 12, 20 I I ITEMNO.6A It should be noted that these sight distance measurements were taken during a week-day when there were no vehicles parked on either side of Glasgow Drive. During heavily attended sporting events and TGIF Jazz Concerts, parking demand commonly exceeds the on-site parking lot capacity, resulting in vehicles parking adjacent to the subject intersection. Vehicles parking adjacent to and near the subject intersection would reduce the available sight distance from both the park driveway and Middleton Drive. Section 2B.07 of the California MUTCD allows consideration of an ALL-WAY STOP at "locations where a road user, after stopping, cannot see conflicting traffic and is not able to reasonably safely negotiate the intersection unless the conflicting cross traffic is also required to stop. " Staff members attending sporting events and TGIF Jazz concerts at the park over the years have observed large numbers of pedestrians crossing Glasgow Drive at the subject intersection and the other intersections and at various midblock locations. During these events, conflicts were observed by staff at this intersection between pedestrians and vehicles. Section 2B.07 of the California MUTCD allows consideration of an ALL- WAY STOP when there is a "need to control vehicle/pedestrian conflicts near locations that generate high pedestrian volumes. " The city has installed ALL-WAY STOPs at other locations nearby school locations as a result of similar analyses. These locations include Camino de las Ondas and Hidden Valley Road adjacent to Pacific Rim Elementary School, Calle Acervo adjacent to Olivenhain Pioneer Elementary School and Calle Acervo near La Costa Canyon High School, and the pending installation at Monroe Street and Gayle Way adjacent to Carlsbad High School. Based on these findings, staff recommends that an ALL-WAY STOP be established at the intersection of Glasgow Drive and Middleton Drive to assign the right-of-way between vehicles and pedestrians. In conjunction with installing STOP signs on both legs of Glasgow Drive at Middleton Drive, staff also recommends installation of marked crosswalks across all four legs of this intersection. RECOMMENDATION: Based on the findings contained in this report, the Traffic Safety Coordinating Committee recommends the installation of an ALL-WAY STOP at the intersection of Glasgow Drive and Middleton Drive. NECESSARY CITY COUNCIL ACTION: The City Council must adopt an ordinance to establish the stop control as recommended. Page 4 NOT TO SCALE LOCATION MAP CALAVERA COMMUNITY PARK PROJECT LOCATION DRIVE: "U 0 z ---i LEGEND: @ TRAFFIC SIGNAL PROPOSED ALL-WAY STOP GLASGOW DRIVE AND MIDDLETON DRIVE EXHIBIT t 1 l .__ ____________________________ _._ __ __.. r------------\s.,------------.. ✓)------------, 250' REQUIRED 172' MEASURED ------------------------ REQUIRED LINE OF SIGHT ------ MEASURED LINE OF SIGHT z ~ w cS~ o--OC: ::::;; Cl >-~ :,,::::W a,:> <( a,: CL Cl 250' REQUIRED 244' MEASURED GLASGOW DRIVE ~ CONFLICT POINT >-~ :,,::::W a,:> <( i:i:: CL Cl DECISION POINT CONFLICT POINT GLASGOW 10, DRIVE DECISION POINT MEASURED LINE OF SIGHT REQUIRED LINE OF SIGHT ~ ~ !, I 0 NOT TO SCALE DATE OF MEASUREMENTS: 8/9/11 ° EX;BIT ! GLASGOW DRIVE AND MIDDLETON DRIVE SIGHT DISTANCE ANALYSIS '---------------------------------.L...-----10