Safe guidance options for high speed travel in very narrow aisles requires the vehicle to first enter the guided aisle.

Tapered aisle entry rails assist the operator in lining up the vehicle. Once the vehicle has entered the aisle the guide rail sensor switch from manual steering (operator control) to automatic straight wheel.

In this manner the vehicle travels most efficiently down the narrow rail guided aisle, without attempting to steer against the guide rail but rather steer parallel along the rail.