Crash tests were conducted to compare the effect that stiffening of the front-end structure of a bus might have on the driver and the passengers. Five frontal offset transit bus crash tests were conducted with transit buses at 40 km/h and a 40 %, driver-side offset. The test parameters for the two pairs of crash tests were matched except for some structural strengthening that was added to the front end of one striking bus from each pair. Anthropometric Test Devices (ATDs) were installed in the driver seat and at various locations on-board the striking vehicle. ATD positions were matched for each pair of tests. The strengthening of the bus reduced the intrusion into the occupant space of the driver and resulted in negligible changes in peak acceleration (<2 g) of the passenger compartment of the bus. In all tests, the acceleration of the striking bus never exceeded 10 g. All ATDs placed in the passenger compartment of the striking bus (with the exception of a restrained ATD in a wheelchair) either impacted the seat in front with the head or were ejected from the seat. Research efforts should be directed towards improving energy absorption and the development of complementary tools to better assess injury mechanisms.