The engineering extrapolation of the data from the University of Minnesota tests on the hydraulic bumper - automatic seat-belt package made with 3600 and 6000 lb. automotive vehicles is presented to show the forces of impact on passengers in small cars, buses, trucks and semis for a series of accident conditions. The structural protection required for a safer crash of one vehicle into the side of another and into barricades with this package is prescribed. It has been found that small cars, given additional rigidity, and head room for the passenger, have nearly the equivalent safety characteristics of larger cars, and heavy transports may incorporate greater safety for drivers.