The Green Light You Can't Trust
You are approaching a railroad-highway crossing at night in a 70-foot combination vehicle at 50 mph. The crossing has flashing red lights, a gate, and a stop line, but no bell you can hear over your engine. As you near the stop line, the lights begin to flash and the gate starts down. Your tractor's front axle is roughly 40 feet from the stop line, and your total stopping distance at this speed on dry pavement is about 250 feet. The road is straight, visibility is good, and there is no traffic behind you.
1. What do you do, and what makes this a judgment call rather than a reflex?
Read the worked answer
Brake now, smoothly and firmly, and stop before the stop line. You cannot clear the crossing, and you must not try.
The arithmetic decides it: your stopping distance is about 250 feet and you are 40 feet from the line - you are already past the point where a normal stop is comfortable, so this becomes a controlled emergency stop. But the alternative is worse. A 70-foot combination at 50 mph needs several seconds to clear a crossing, and the gate is already descending. Trying to beat it puts the trailer across the tracks when a train arrives.
- Apply the brakes progressively, not in a panic stab that locks the tractor and jackknifes the trailer.
- Keep the wheels rolling and the vehicle straight.
- Do not swerve around a lowered gate under any circumstances.
This is a judgment call because the instinct is to 'make it,' and the physics says you cannot.
2. After you stop, the gate is down and the lights keep flashing, but no train appears for several minutes. What do you do?
Read the worked answer
Stay stopped. You do not go around a lowered gate, and you do not treat a long wait as evidence the signal is broken.
- A gate down and lights flashing means stop, full stop, regardless of how long it lasts. Signals fail in the safe direction far more often than they fail open, and a second train can follow the first.
- If you believe the signal is malfunctioning, the correct move is to report it - not to drive through it.
- If you are already stopped on the tracks, that is a different emergency: get everyone out and away, and move the vehicle only if you can clear completely.
- Once the gate rises and the lights stop, look and listen both ways before proceeding, because a second train can come from either direction.