Final answer:
A bus driver must stop 15 to 50 feet before the nearest railroad track to ensure safety and prevent accidents at the crossing.
Step-by-step explanation:
According to the Driver Education rules, a bus driver must stop 15 to 50 feet before the nearest railroad track. This is to ensure the safety of the passengers and prevent accidents at the crossing. The distance may vary depending on local regulations or specific circumstances, but it is generally advised to come to a complete stop and check for any oncoming trains before proceeding.