HOS

Definition

HOS - Hours of Service - is the federal regulation under 49 CFR Part 395 limiting how long a CDL driver can spend driving and on duty. Property-carrying drivers are limited to 11 hours of driving within a 14-hour on-duty window, after 10 consecutive hours off-duty. The 60/70-hour rolling limit caps total on-duty time across any 7- or 8-day period. Passenger drivers face slightly different limits. Short-haul drivers operating within 150 air miles are subject to abbreviated HOS rules. HOS violations are a major driver of the HOS BASIC under CSA. ELDs automate HOS recordkeeping for most interstate CDL drivers.