Pennsylvania law requires drivers to stop for a school bus with flashing red lights and an extended stop arm, regardless of direction, unless separated by a physical barrier.
A yellow light warns that the signal is about to turn red. You should stop if you can safely do so to avoid running the red light.
A solid double yellow line indicates that passing is not allowed for traffic in either direction. It separates traffic moving in opposite directions.
When an emergency vehicle is approaching with lights and sirens, drivers must pull over to the right side of the road and stop to give it a clear path to pass.
A red octagon is universally recognized as a stop sign, requiring drivers to come to a complete stop at the marked line or before entering an intersection or crosswalk.
