What is the minimum distance that vehicles must stay to the right when approaching a bridge, tunnel, or railroad crossing?

The correct answer indicates that vehicles must remain at least 100 feet to the right when approaching a bridge, tunnel, or railroad crossing. This distance is set to ensure that there is sufficient space for vehicles to maneuver safely and avoid potential collisions or obstructions as they approach these structures. Bridges, tunnels, and railroad crossings often present unique challenges, such as limited visibility and reduced reaction time due to restricted movement.

By maintaining a distance of 100 feet, drivers can better anticipate traffic flow, identify any hazards, and ensure they have enough room to stop if necessary. This distance helps increase overall roadway safety, promoting smoother operations for all vehicles traveling through potentially hazardous areas.