Showing Tag: "bicycle" (Show all posts)

Bicycle Detection at Traffic Signals

Posted by Steve Fitzsimons on Wednesday, January 22, 2020, In : For Traffic Signal Designers 
As a frequent bicyclists, one of my regular frustrations is the inadequate bicycle detection.  The industry guidelines suggest a single 6-foot long detection zone at the stop bar in a bike lane or in vehicle lanes is adequate.  However, when I am on my bike, approaching an intersection with one or two vehicles waiting, and see the light go green, I often groan because I can see the green light will not last long enough for me to make it.  I am left with the choice of pumping really hard to tr...
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Detecting Bicycles with Loops

Posted by Steve Fitzsimons on Wednesday, March 31, 2010, In : For Traffic Signal Designers 

Question:  My City has been responding to calls lately about bikes not getting detected at traffic signals.  We use the Type D loop at the front of all our Stop Bar detection, which is supposed to pick up bicycles.  Do we need to connect that front loop to its own Detector Cable? 

Answer:  The typical detector loop has a Type D loop right at the stop bar (the bike loop), and three Type A loops connected in series-parallel extending away from the intersection.  As you noted, this style of de...


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New Bicycle Standards

Posted by Steve Fitzsimons on Thursday, December 3, 2009, In : For Traffic Signal Designers 

Question:  I’ve been told Caltrans recently issued new guidelines on accommodating bicycles at signalized intersections.  Where can I find the details?

Answer:  In August, 2009, Caltrans issued a Policy Directive about new requirements for bicycle detection at signalized intersections and new guidelines for traffic signal timing to accommodate bicycle travel speeds.  You can find the full document at http://www.dot.ca.gov/hq/traffops/signtech/signdel/policy/09-06.pdf.  The document describ...


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About Us


Steve Fitzsimons If you would like to ask a question about driving rules, traffic signals or street lights, send your questions to: SFitzsimons@W-Trans.com or call 650-314-8313. Steve Fitzsimons is a professional Civil Engineer and Traffic Engineer in California. He is a principal at W-Trans. Find out more about W-Trans at www.w-trans.com **** If you need a traffic signal design or review, W-Trans is available for hire. If you are an electrical contractor, W-Trans is available for hire to prepare timing plans or traffic control plans.

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