Our ParkLock is a system for locking the gearbox and thus the driveline to prevent the vehicle from rolling away when parked. According to DOT for a vehicle to be road legal it must have a positive locking system to prevent rollaway other than the vehicles e-brake. The DOT goes on to say the locking mechanism must be applied as one in the same function as placing the vehicle in the park position, it should not be a separate function. Setting an e-brake when parking even with a transmission lock is accepted and recommended by most car manufacturers. The ev world is rapidly changing but at the time of our ParkLock system development and at the time of this writing, the ParkLock system is a sound investment in safety. We have all heard horror stories about cars and especially ev conversions rolling away. I know of one that ended up in a neighbors swimming pool at the bottom of the hill. ParkLock would have prevented this.