Roof Crush Test

Rollover test and nass case analysis nhtsa june 1992.

Roof crush test.

Roof crush resistance 222 13 kb final rule. Roof crush is the failure and displacement of an automobile roof into the passenger compartment during a rollover accident. The number of occupant injuries is significantly higher. Every year approximately 10 000 americans are killed in rollover accidents accounting for about 30 of all light vehicle occupant fatalities.

The relationship between injury levels and intrusion or roof crush has. Televise the results of drop tests or jordan tests or cris tests and let the public see the differences between those which only pass the federal 216 test and the best. Although their procedure is similar to that of fmvss 216 216a the requirement to earn the highest rating is 4 0 times the vehicle s curb weight. Earlier in february 2009 the iihs announced a new rating system based around roof crush testing.

Supplemental notice of proposed rulemaking snprm. Federal motor vehicle safety standards. The recently released nhtsa study roof crush analysis using 1997 2001 nass case review which has been in the works for nearly four years reviewed nass rollover crashes in an effort to determine whether roof deformation patterns identified in an earlier agency study were still valid for current vehicle designs see upgraded rollover roof crush protection. The insurance institute for highway safety has released results from its new crash test program.

The force applied relative to the vehicle s weight is known as the strength to weight ratio. Eleven midsize 4 door suv roof designs were subjected to a test similar to the one conducted by automakers to comply with federal roof strength requirements. 49 cfr parts 571 and 585216 as part of a comprehensive plan for reducing the risk of rollover crashes and the risk of death and serious injury in those crashes this final rule upgrades the agency s safety standard on roof crush resistance in several ways. Researchers applied force to the roofs until crush reached 10 inches measuring the peak force required for 2 inches of crush 5 inches of crush and 10 inches.