I dont know what the labour law legislation is like in other countries but in south africa an employer has to take every precation available to them to ensure that their employees are safe. In the event of a tip over in a forklift truck the only real safety device is the seat belt and their safety cell. Should a driver be killed in the work place due to a forklift vehicle tipping over would you rather be standing infront of the investigating team telling them that this device was installed and you always encouraged drivers to wear their seatbelt or stand there and use a south african expression "angazi" which means " I dont know"