Which distance marks the area where a driver must not drive left of center when approaching a railroad grade crossing?

When approaching a railroad grade crossing, drivers are required to keep to the right of the centerline of the roadway within a designated distance to ensure safety. The correct distance for this restriction is within 100 feet of the crossing. This regulation is in place to prevent potential collisions with trains, which can occur when a vehicle crosses in front of an oncoming train, particularly because the visibility of the tracks can be limited due to various factors like trees, vehicles, or other obstacles.

Maintaining this distance helps ensure that drivers have adequate time and space to react to oncoming trains, which typically travel at high speeds and may not be able to stop in time if a vehicle is obstructing the tracks. This requirement illustrates the importance of safety measures at railroad crossings, where the risks associated with any incursion into the left lane can be severe. Therefore, the reliance on the 100-foot rule is a critical guideline for safe navigation near railroad crossings.