A 3-minute lesson from the Idaho course. Read the rules and examples, follow the handbook page references, and check your understanding before you move on.
Signals control who moves through an intersection and when. The color matters, but so does whether it's a circle or an arrow and whether it's steady or flashing.
Know the rule
Vertical signals: red on top, yellow in the middle, green on the bottom. Horizontal signals: red on the far left, yellow in the middle, green on the far right.
Two red lenses over one yellow lens, on a mast arm and roadside, letting pedestrians cross. Side streets have no signal; a side-street stop sign stays in force.
A power outage knocks out the signal at a busy intersection. Treat it as a four-way stop: stop, let the first vehicle to arrive go first, and if you arrive together, the driver on the left yields to the driver on the right.
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.
A flashing red light means:
proceed with caution without stopping
stop completely, then go when clear
stop and wait for it to turn green
slow down, but you need not stop
Answer: stop completely, then go when clear
A flashing red means stop: come to a complete stop, yield, then proceed when clear.
