For many years, it has worked collaboratively with FMCSA and NHTSA to maintain the Trucks Involved in Fatal Accidents (TIFA) and Buses Involved in Fatal Accidents (BIFA) databases. Starting with cases identified in the Fatality Analysis Reporting System (FARS) (the U.S. national database of road traffic fatalities based on police crash reports), UMTRI researchers collect detailed data on vehicle configuration, cargo type, hours of driving, and other variables. In addition, TIFA and BIFA data collection protocols are easily adapted to address emerging issues.[21][22] Other strengths of the UMTRI program include vehicle engineering, crash avoidance systems such as collision warning systems and stability control, biomechanics, and risk factors such as distraction, fatigue, and medical conditions.