MakoMania
TS Member
^Supposedly it's because (whilst it would be safe), having only a lap bar in the 3rd car of the train (most of these Sky Rocket II rides have 2 cars) may present a wiplash risk on the vertical twisted drop simply because the 3rd car takes the element much more rapidly than was originally designed for the 2 cars. The comfort collars restrict upper body movement, making violent upper body motion less likely.