You are in the left lane of a one-way street and stop at a red light. You want to turn left onto a street that carries traffic in both directions. No sign about turns on red is posted. What does Pennsylvania law allow?

Correct answer: You may not turn left on red here, because the street you enter carries two-way traffic.

Why

On a one-way to one-way turn, the left turn on red works like a right turn on red: you stop, you yield to pedestrians and traffic, and a sign can still prohibit it. When the street you enter carries two-way traffic, a turn on red would put you across or into lanes where drivers have a green light, so the law does not allow it. Start the turn from the left lane of the one-way street.

Verified against Pennsylvania Driver's Manual · Red, Yellow and Green Traffic Lights and Arrows · p. 11, 50