FMCSA’s latest Seat Belt Usage by CMV Driver Survey (2016) estimated the overall safety belt usage rate for drivers of medium and heavy-duty trucks and buses was 86%. The same survey estimated the usage rate for other CMV occupants (not including the driver) was 69.8%. https://www.fmcsa.dot.gov/sites/fmcsa.dot.gov/files/docs/safety/safety-belt/84811/sbucmvdexecsummary-2016.pdf