How does a signal operate? Is a specific signal operating correctly?
There are many different types of traffic signals. Some are fixed-time, meaning each movement gets a preset amount of time. Some use detectors buried in the pavement or cameras mounted on street lights above the intersection, and time is allocated based on the volume of vehicles sensed by these detectors.

At other intersections, some movements have detectors and other movements do not. At some intersections, where possible, the pedestrian movement is automatically recalled each cycle. At others pedestrians must push a button to bring up the walk signal. The proper operation of signals can be checked remotely by computer or in the field by traffic signal personnel.

Those with specific questions about signal operations should contact the Traffic Engineering Division at 707-543-3814.

Show All Answers

1. How are speed limits established and how can I reduce or increase the speed limit on a particular street?
2. Can the City install "Children at Play" or "SLOW" signs on my street?
3. Can the City install a deer crossing sign at a particular location?
4. Can I get red curb painted in front of the fire hydrant by my house?
5. Can the City paint red curb so I can see getting out of a driveway, street or parking lot?
6. How can I get a stop sign installed on a neighborhood street to slow speeders down?
7. What is a commercial vehicle prohibition?
8. How can I get a radar speed feedback sign on my street?
9. How long can a car stay parked on the street?
10. How does a signal operate? Is a specific signal operating correctly?
11. How does a signal operate? Is a specific signal operating correctly?
12. Why do I have to stop? Why are signals so poorly synchronized?
13. Why do I have to wait so long after I stop at a specific signal?
14. Why isn’t there enough green time to get the traffic through the signal for a specific movement?
15. How do I get a new signal installed?
16. How do I find how much traffic there is at a specific location, or how many accidents there have been?
17. How do I find how a signal was operating at a specific time and date, and if it was operating correctly?
18. How does a pedestrian signal work?