The Pennsylvania's Driver's Manual states that driver's cannot park within 50 feet of the nearest rail of a railroad crossing.
As far away as you wish. However local legislation may stipulate a minimum distance.
Stop at the stop lines for the railroad tracks or if there aren't any there stop 15 - 20 feet away from the gates.
When stopping for traffic purposes near a railroad track, 50 feet is how far away you're supposed to be, so I assume it's 50 feet or more.
50 feet
15 and 50 feet
unless car in front has moved far enough up
Depends on the size of the fire. I will park as far away as I could.
You can park as far away as you want. However you should never park closer than 10 feet.
You must park 5 feet away from a driveway.
about an hour and 15 minutes
At the white stop line, or with no white line, at least 15 feet back.