Traffic signals are traffic control devices that guide road users by assigning right of way to vehicles and pedestrians. They help optimize traffic flow, improve intersection efficiency and provide consistent rules for everyone on the road. By communicating when to stop, go or proceed with caution, traffic signals create an orderly flow of movements that would otherwise conflict.
The primary goal of a traffic signal is to move traffic efficiently and effectively.
A flashing yellow arrow is a traffic signal used over the left‑turn lane at an intersection. It provides a safer and more efficient left‑turn option for motorists and replaces the flashing red left‑turn signals commonly used in Michigan. Flashing yellow arrows help reduce crashes, move more traffic through an intersection and offer greater traffic management flexibility for road agencies.
Traditional traffic signals can blend into the sky and become harder to see. Adding a black backplate and face improves daytime visibility by about 33 percent. A reflectorized border enhances visibility even further, especially at night.
This safety countermeasure also helps during power outages by providing a visible cue that alerts motorists to stop at the intersection ahead.
HAWK signals provide safer crossing options for people walking and biking, especially at high demand mid‑block locations. Because these signals activate only when pedestrians or bicyclists are present, drivers experience minimal delays and it ensures easier and safer crossings for people on foot or bike.
RRFBs can be installed alongside pedestrian warning signs to improve pedestrian visibility and increase driver awareness at uncontrolled, marked crosswalks. They include two rectangular yellow indications, each with a light‑emitting source. When activated, the lights flash in an alternating high‑frequency pattern.
Countdown pedestrian signals show how many seconds remain before the walk signal changes. This helps pedestrians judge whether they have enough time to cross and adjust their speed if needed.
Knowing whether to finish crossing or wait for the next signal improves safety for both pedestrians and motorists.
