Railway crossings can be hazardous. You want to minimize the time you spend there. Still, it takes a typical tractor-trailer more than 10 seconds to clear a single railway track. And it can take even longer if the crossing surface is rough, there is more than one track to cross, your vehicle is extremely heavy or long, or the approach grades to the tracks are steep (which can cause a low-slung vehicle to get hung up on the tracks altogether).