Final answer:
2) 15 feet. A driver required to stop at a railroad crossing should bring the vehicle to a stop no closer to the tracks than 15 feet.
Step-by-step explanation:
According to traffic laws, a driver required to stop at a railroad crossing should bring the vehicle to a stop no closer to the tracks than 15 feet. This ensures that there is enough space for the vehicle to stop safely and give clear passage for trains. This distance helps to prevent any potential accidents or collisions at the crossing.
For example, if a driver stops too close to the tracks, it may increase the risk of the vehicle being hit by an approaching train. By stopping at least 15 feet away from the tracks, it allows enough space for the vehicle and ensures the safety of both the driver and the train.
Therefore, the correct answer to the question is option 2) 15 feet.