At a Texas railroad grade crossing, how far from the nearest rail must you stop when required by flashing red lights, a warning bell, a flag person, or another warning device?

1. Within 15 to 50 feet of the nearest rail
2. Within 5 to 10 feet of the nearest rail
3. At least 100 feet from the nearest rail in every case
4. Anywhere past the gate if you can still see the train