Browsing Archive: July, 2014

Protected Permissive Left Turns

Posted by Steve Fitzsimons on Wednesday, July 16, 2014, In : For Traffic Signal Designers 
Mid-sized and smaller cities have frequently chosen to provide protected left turn phasing on main street approaches of signalized intersections, citing a belief that it provided safer operations.  Recently however, this traditional belief has been challenged for a variety of reasons.  An option that combines protected phasing with permitted phasing emerged and is starting to see deployment.  Also, federal research identified a new approach in the signal display, using a flashing yellow arrow...
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Traffic Adaptive Systems in the US

Posted by Steve Fitzsimons on Wednesday, July 2, 2014, In : For ITS Designers 
Traffic adaptive systems are computer systems that coordinate traffic signals by continually monitoring traffic volumes and making updates to the coordination plan every few seconds.  The concept is intended to provide ideal traffic signal operations through a corridor with multiple traffic signals.  A dozen years ago there were very few adaptive systems deployed in the US, and these were mostly in large cities with very high volumes of traffic.  Now a large number of systems have been deploy...
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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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