I work for LINDE in the u.k In my experiance drivers drive foot hard down no matter what,all new LINDE'S electric+i.c can be slowed down with laptop at the press of a button,this only affects the speed of the drive not the engine rpm so hydraulic operation is not affected,drivers soon work out how to adjust engine speed back if done mechanically.If max truck speed is set correctly to suit site conditions their is no need for a speedo because as said earlier drivers only go flat out all the time.As to wearing seat belts unless companies strictly enforce drivers to wear them and use disaplinary action in my experience drivers don't bother wearing them. A.J