The Truck & Bus section of the crash report is a vital and mandatory component that must be completed if the crash meets the criteria. Often, it is difficult to accurately complete this section because the fields are specific to Commercial Motor Vehicles (CMVs), and may be less familiar to many law enforcement officers. Please use care when completing a crash report involving a large truck or bus; this data is used to populate a mandatory specialized crash report form, which is submitted to the Federal Motor Carrier Safety Administration (FMCSA).