Signs & Signals
Idaho traffic signs use shape and color so their meaning is clear before you read the words. Recognizing signs and signals quickly is the foundation of safe driving and a large part of the knowledge test.
Shapes and colors
A red octagon means STOP and a downward triangle means YIELD. Yellow diamonds warn of hazards ahead, orange marks work zones, and white rectangular signs are regulatory, such as posted speed limits you must obey.
Traffic signals
A steady red means stop and stay stopped, while a steady yellow warns that red is coming, so stop if you can do so safely. A flashing red works like a stop sign: stop, then go when it is safe.
Pavement markings
Yellow lines separate traffic moving in opposite directions, and a solid yellow on your side means no passing. A solid white edge line marks the right boundary of your lane.