When is it legal to resume normal speed when traveling through a school zone?

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You resume normal speed once you have passed the end-of-school-zone sign, which marks the boundary of the reduced-speed area. In the zone, you must drive at the posted lower limit to protect children and pedestrians; the signal to go back to normal speed is the sign indicating you’re leaving the school zone. The other options—green light, a time limit, or seeing children—aren’t legal triggers for changing your speed.