The Dark Beacon: School Zone Limit Outside Its Stated Hours
At 2:40 p.m. on a Tuesday in late September you are eastbound on a two-lane North Dakota state highway posted at 65 mph, approaching the edge of a town of about 1,900 people. You pass, in order: a yellow diamond school crossing warning sign, then a white regulatory assembly reading SCHOOL SPEED LIMIT 20 with a plaque reading WHEN FLASHING 7:30–8:30 A.M. AND 3:00–4:00 P.M. The amber beacon above the sign is dark. Two blocks ahead, a crossing guard in a fluorescent vest stands on the curb with her stop paddle held at her side; six or seven children are on the sidewalk, and one is walking a bicycle down a driveway toward the road. The first intersection, where your direction has a stop sign, is about 350 feet past the school sign. A car behind you is closing at roughly 55 mph. Your speedometer reads 58 mph.
1. Is the 20 mph school speed limit enforceable at 2:40 p.m.? What speed should you be showing at the school sign, and what rule actually governs you right now?
Read the worked answer
No - the 20 is not in force at 2:40. The white SCHOOL SPEED LIMIT 20 sign is regulatory, but the plaque attached to it defines when it is regulatory: only during the flashing periods (and here the beacon is dark in any case). Outside those windows the statutory limit for the road applies.
The trap is thinking that makes 58 automatically legal because it is below 65. It does not. The basic speed rule - speed must be reasonable and prudent for existing conditions - governs, and the conditions here are a school at dismissal time, children on the sidewalk, a cyclist entering the roadway, and a guard positioned to step out. A reasonable speed at the sign is roughly 25–30 mph, decelerating before the sign rather than at it.
Note also the trigger point: when the beacon is flashing, the 20 begins at the sign, not at the school building, and ends at the end-of-zone marker.
2. The beacon is dark and the guard's paddle is still at her side. What do the guard and the children change about your legal duty, and what must you do if she steps into the roadway and raises the paddle?
Read the worked answer
The dark beacon removes the 20 mph limit; it removes nothing else. A crossing guard is an authorized traffic control presence, and a raised paddle is a lawful order to stop - it carries the same practical force as a stop sign, whether or not a crosswalk is painted at that spot.
While the paddle is down, her presence plus the children is still evidence that the posted 65 is unreasonably fast for conditions. You should already be slowing and covering the brake, because a child on a bicycle in a driveway can enter the roadway in under two seconds and you cannot stop a 58 mph vehicle in that distance.
If she steps out and raises the paddle: stop before the crossing and remain stopped until she lowers the paddle and clears the roadway - not merely until the children reach the far curb. Do not wave her across and do not creep forward; the car behind you at 55 mph is a reason to brake early and gradually, not a reason to roll through.