A 3-minute lesson from the Iowa course. Read the rules and examples, follow the handbook page references, and check your understanding before you move on.
Traffic signals assign turns at busy intersections, but they never replace your judgment—even on green you yield to anyone still in the intersection. Law enforcement, highway personnel, and school crossing guards can also control traffic.
Know the rule
You must follow directions from law enforcement, highway personnel, or school crossing guards controlling traffic.
Your light turns green, but a car that entered on the last yellow is still crossing in front of you. Wait for it to clear before you go—green means go only when the intersection is clear.
Check your understanding
Read the question, decide on an answer, then open it to check the explanation. These are Roadwise study questions based on the source handbook.
What must you do at a flashing red traffic signal?
Slow down but you do not need to stop
Proceed only if no cars are visible
Stop only if other cars are present
Treat it the same as a stop sign
Answer: Treat it the same as a stop sign
A flashing red signal is treated the same as a stop sign.
