Why does a left turn arrow come on even when there is no traffic turning left?
Vehicle sensing cameras or in-pavement sensors can fail; and when this happens, the sensors fail in the "constant call" mode causing the left turn arrow to come on with or without the presence of traffic.

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1. What road construction projects are currently being worked on in Plano?
2. Why does a left turn arrow come on even when there is no traffic turning left?
3. How do Single Point Urban Interchanges (SPUI) compare to traditional interchange designs?
4. How do I request a school zone?
5. How do I report malfunctioning signals, downed signage, and faded pavement markings?
6. Who should I call to report a problem with a DART bus route, bus stop, or train gate?
7. How can a citizen participate in DART bus/rail service planning or make contact with DART board representatives?
8. Where can I get more information on the red light camera program?
9. Where can I find summary information on the ordinances governing motor vehicles and traffic in the City of Plano?