What do I do when I see a dark or flashing traffic signal?

To report a traffic signal intersection that is entirely DARK or FLASHING outside of business hours (Monday through Thursday, 8:00 a.m. to 5:00 p.m.), please call the Jefferson County Sheriff’s Office at 303-980-7300. During business hours, contact the Jefferson County Transportation and Engineering Division at 303-271-8495.

If a traffic signal is entirely dark or flashing, Colorado State Law dictates that motorists shall treat the intersection as all-way stop control, unless an officer is directing traffic.

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1. What do I do when I see a dark or flashing traffic signal?
2. What happens to Jefferson County traffic signals when they lose power?
3. Who regulates traffic in Jefferson County?
4. Who builds and maintains traffic signals in Jefferson County?
5. How do traffic signals work?
6. Who maintains flashing school zone beacons?
7. How does the county decide when a traffic signal should be installed? Will a traffic signal reduce accidents at an intersection?
8. What is the purpose of cameras at signalized intersections?
9. Are traffic signals in Jefferson County coordinated to reduce or eliminate the need to stop at red lights?
10. Once a driver turns onto a street where the traffic signals are coordinated, is it correct that the driver should not have to stop?
11. Do any traffic signals not run in coordination with other traffic signals?
12. Why is there a “Walk” symbol when no pedestrians are present?
13. How do signals for pedestrians work?
14. Why do I have to wait so long to get a green light or a “Walk” signal?
15. Do emergency vehicles get priority at signalized intersections in Jefferson County?
16. Is it possible for two conflicting directions of traffic at a signalized intersection to receive green lights at the same time?
17. How does a flashing yellow left-turn arrow work?