Loading...
HomeMy WebLinkAbout7.3 DB@SlvrgtBike/PedLnGITY OF DUBLIN AGENDA STATEMENT City Council Meeting Date: January 9, 1989 SUBJECT: Dublin Boulevard at Silvergate Drive Bike/Pedestrian Lane Interim Revision (Report by: Public Works Director Lee Thompson) EXHIBITS ATTACHED: Intersection diagram will be displayed at meeting RECOMMENDATION: ,.~ ~/Receive report; authorize Staff to make interim improvements. FINANCIAL STATEMENT: Approximately $200 to make recommended changes. DESCRIPTION: At the November 28, 1988, City Council meeting, resident Dave Burton stated that there was a potential traffic problem on the north side of Dublin Boulevard at Silvergate Drive where the bike lane becomes very narrow. Additionally, there is an asphalt berm at the far edge of the bike lane. Mr. Burton said that he had nearly hit a bicyclist near this curve because the bicyclist turned to look for approaching cars and when doing so, veered out into the traffic lane. The City Council directed Staff to take a look at this intersection and determine whether any interim improvement could be made that would provide additional space for bicyclists and pedestrians, who must walk along the shoulder of the road since there is no sidewalk at this portion of Dublin Boulevard. The intersection will ultimately be redesigned in conjunction with the Hansen Ranch development. Staff made a field investigation at the intersection and found that the present space allotted to bicyclists is approximately 2'6" wide at its narrowest point. The traffic lane at this point is just over 14 feet wide, which is wider than the Il-foot minimum requirement for a traffic lane. It would therefore be possible to restripe the lanes to allow 4'6" for the bike lane and still leave just over 12 feet for the traffic lane. The curve in the bike lane stripe would need to be realigned in order to maintain the 4'6" width. A vertical curb between the bike lane and the traffic lane was discussed but rejected because it would further constrict the already narrow lanes and would add an obstruction for both bicyclists and vehicles. Staff further proposes installation of a curve warning sign and an advisory speed limit sign of 15 mph. This measure would serve as an indication to both motorists and bicyclists that care should be taken when passing through this area. The estimated cost of these improvements is approximately $200. GITY OF DUBLIN MEMORANDUM Date: To: From: Subject: January 3, 1989 Lee Thompson, Public Works Director Steve Loweree, Maintenance Superintendent Dublin Boulevard at Silvergate Drive Attached is a diagram of proposed changes to this intersection, particularly the bike lane. The changes are based on the knowledge that (1) the minimum width of a traffic lane can be eleven (11) feet, (2) that this is a bike lane (adjacent and contiguous with road surface) as opposed to a bike path (5' minimum and physically separated from road surface by curb, sidewalk, or right-of-way), and (3) the minimum width of a bike lane can be four (4) feet. Based on this, we can realign the bike lane to a minimum of 4'6". The narrowest point of the bike lane is 2'6" Adjacent to this point is a through traffic lane that is 14'2" wide. The bike lane can be widened to 4'6", thus narrowing the traffic lane to 12'2". The traffic lane would still be over the minimum width needed. The bike lane stripe would need to be realigned approximately 50 to 75' to maintain a 4'6" width. I feel that widening the bike lane any more would make the travel lane too narrow, as it is situated on a curve. There are some additional steps for your consideration as well. First, as discussed previously, would be the installation of warning signs for the curve. Included would be a yellow 15 mph warning sign for the curve (see diagram) in an attempt to slow down motorists and increase reaction time to pedestrians/cyclists in the bike lane, as well as increase reaction time for bike lane users to motorists. The location of these signs would need to be further down the hill on Dublin Blvd. than the plan shows since space was limited on the 8 1/2 x 11 sheet. The second item would be the installation of a bike lane legend with arrow prior to the curve. This would just reinforce the idea of a bike lane. The third item would be a "Slow Curve" legend painted on Dublin Blvd. adjacent to the new warning signs. Approximate costs for these items would be $200 - $300. Finally, I feel that TJKM should review and comment on this plan for any flaws. If you have any questions, please advise. SL/gr Attachment cc: TJKM { / DUSL~N U~NF- GLVD. / i 11 LEGEND J ~ REGULATORY SIGN j~--- ~FFlC SIGNAL F/CEX~NSION ELEC~OLIER ~ST A~ FACE OF C~B ~ANDARD ~~_ I)A'I f: ~ARY 7, 1986 ( AERIAL ) <~ N{,. I/y IMte Revisions INTERSECTION i ROJECT DATE: SCALE: DESIGNED: DRAWN: CHECKED: PROd. ENGR,: F.B,: REVISIONS  ENGINEERING SANTINA ~ PLANNING THOMPSON ~c. 1040 Oak Grove Road, Concord, California 94518 (415) 827-3200, Telex 338563 Santina PREPARED C TY OF 6500 DUBLIN SUITE 101 DUBLIN FOR: DUBLIN BOULEVARD CALIFORNIA 94568 OF SHEET S HE :TS JOB NO.