Placarded Gasoline at a Rural Crossing, a 13'9" Bridge, and a Bad Place to Park
You are driving a cargo tank carrying 8,000 gallons of gasoline, placarded FLAMMABLE / UN 1203, southbound on a two-lane rural highway at 04:50. Ahead is a highway-rail crossing marked with a crossbuck and flashing red lights but no gates; a freight train runs the line daily. The crossing sits on a slight rise. One mile past the crossing the highway passes under a bridge marked CLEARANCE 13 FT 9 IN, and your combination measures 13 ft 6 in. The only practical detour adds 40 miles. You have been driving 2 hours 10 minutes and want to stop for coffee and a 30-minute break. There is a wide gravel shoulder 4 feet from the edge of the pavement just before the crossing, and the crossing post carries a blue sign with a 1-800 number.
1. Walk through the crossing procedure for this load.
Read the worked answer
A placarded load must stop at highway-rail crossings unless the crossing is exempt, is a streetcar or trolley crossing, or an officer or flagger is directing traffic.
- Slow down and activate four-way flashers well before the crossing.
- Stop 15 to 50 feet from the nearest rail - close enough to see, far enough that the tractor is not fouling the tracks.
- Open the window, turn off the radio and fan, look both ways, and listen.
- Select your gear before the tracks. Do not shift while crossing - a missed gear puts an 8,000-gallon gasoline tank stalled on the rails.
- Cross without stopping, and check that the trailer is clear before you accelerate. Because the crossing sits on a rise, watch that the trailer frame and landing gear clear the rail crown.
If anything about the crossing looks wrong, stop short of it and sort it out there, not on the tracks.
2. The red lights begin flashing when you are 100 feet out. What do you do, and what do you not do?
Read the worked answer
Stop short of the crossing and wait. Flashing red lights mean a train is approaching or the circuit believes one is; you do not get to audit that belief with a gasoline tank.
Do not:
- Try to beat the lights because you cannot see the train yet. At 40 mph a freight train needs well over a mile to stop, and it cannot swerve.
- Drive around lowered gates. There are none here, but the rule stands anywhere.
- Stop on or near the tracks to wait out a long train. Stay back where you stopped.
If the lights keep flashing with no train in sight - a malfunction - treat it as a stop-and-verify: stop, look, listen, and use the 1-800 number on the blue ENS sign to report it. If you cannot positively confirm the crossing is clear, you do not cross. An inconvenience is not the risk you are managing here; a fire involving 8,000 gallons of gasoline is.
3. Address the bridge clearance and the parking plan.
Read the worked answer
Bridge: 13 ft 9 in posted against 13 ft 6 in actual leaves three inches. That is not a margin you bet a placarded load on. Posted clearances can be conservative, but they also go stale - resurfacing, pavement crowns, and your own air suspension and load squat all change the real number. If you are not certain, stop before the bridge and verify, or take the 40-mile detour. A bridge strike with a cargo tank is a catastrophic outcome, not a delay.
Parking: A vehicle carrying a flammable liquid may not be parked within 5 feet of the traveled portion of a public road, and hazmat parking rules also keep you clear of open flames, tunnels, bridges, and crossings. Four feet from the pavement edge, on the approach to a rail crossing, is the wrong answer twice. Drive on to a truck stop or a proper lot and take the break there - or, if the bridge check requires stopping, find a pullout past the crossing and well off the roadway.