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Chris Daniel
New member
Username: Chrisdaniel

Post Number: 2
Registered: 03-2009
Posted on Monday, February 01, 2010 - 10:12 am:   

The traffic lights (travelling both Northbound as well as Southbound on Coit) require a left turn arrow, however the traffic is typically very light at this intersection. I often spend a long amount of time sitting and waiting for the arrow to travel East on Rolater, even though there would be ample opportunity to simply yield to oncoming traffic and turn on a green light. Why does this intersection require an arrow for left turns? Is it because Centennial High School is at that intersection?

Perry Harts, Moderator
Board Administrator
Username: Perry

Post Number: 166
Registered: 06-2002
Posted on Wednesday, February 03, 2010 - 05:24 pm:   


Whenever we have double left-turn lanes we typically use protected only left-turn signal indications. As a result, the northbound direction needed to use protected only left-turn indications. Furthermore, we typically have opposing left turns use the same left-turn signal indications. Therefore, the southbound left is protected only because the northbound is as well.

We just received notice two weeks ago that we have received a grant to retime several intersections in Frisco. This was one of the intersections on the list. As part of the retiming we will be collecting new volume data and considering whether to change the northbound left turn to a single left turn lane. If that is done, we will change the signal phasing to allow the northbound and southbound left-turns on both the green arrow and green ball.

Brian Moen
Assistant Director of Engineering Services

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