Many advanced systems, such as Toyota’s double rail guidance option with auto-center steering have one unique guide roller with a sensor switch that, when contacted, automatically centers the drive tire, enabling the order picker to continue straight through the rest of the aisle. Guide rollers installed on both sides of the order picker allow the forklift to contact the rails on each side and continue to travel down the aisle, potentially minimizing damage to the racking, product, and the order picker. Physical rails need to be installed into the ground in front of the racking to set the path on which the forklift runs.
Rail guidance systems include mounted guide rollers and physical rails within the aisles to help VNA (Very Narrow Aisle) forklifts navigate through aisles.