Hours of Service (HOS) Rules — Driver Hours, Breaks, and Rest Requirements

Hours of Service (HOS) regulations limit how long commercial drivers can drive and work before they must take rest. The rules are designed to prevent fatigue-related crashes. HOS rules apply to drivers of commercial motor vehicles weighing 10,001+ lb GVWR (interstate) or 26,001+ lb GVWR (intrastate, in most states). The rules differ between property-carrying drivers (most truckers) and passenger-carrying drivers (bus drivers). HOS compliance is monitored via Electronic Logging Devices (ELDs) since 2017 — paper logs are largely a thing of the past.

Drivers of commercial motor vehicles weighing 10,001+ lb GVWR engaged in interstate commerce. Drivers of CMVs designed to carry 9+ passengers (including driver). Drivers of vehicles carrying placarded hazardous materials. Drivers operating across state lines or in interstate commerce — even if the trip doesn't cross state lines, transporting goods that are part of interstate commerce makes the rules apply.

Short-haul exemption (150 air-mile): Drivers operating within 150 air-mile radius of their normal reporting location, returning to the same location within 14 hours, and not driving more than 8 hours, are exempt from logs and 30-minute break (must keep time records, not log books).
Adverse driving conditions: If weather or unforeseen conditions extend driving time, drivers can add up to 2 hours to the 11-hour limit and 14-hour window.
Oilfield exemption: Drivers servicing oil and gas wells in certain configurations get expanded HOS allowances and can use a 24-hour restart instead of 34-hour.
Agricultural exemption: Farm-to-market drivers within 150 air-miles of source/destination during harvest planting periods can have expanded HOS.

HOS violations are assessed as a fine and CSA points. Driver/HOS violation fines: $1,000-$3,000 per violation (state-imposed). Carrier fines: up to $11,000 per violation. Operating after exceeding HOS limits: vehicle out-of-service, driver out-of-service for 10+ hours. Pattern of HOS violations: FMCSA CSA scores increase, leading to compliance reviews, potential out-of-service orders for the carrier. Falsifying logs (paper or electronic): criminal fraud charges possible, automatic CDL disqualification.

(1) Plan loads around HOS clocks — pickup and delivery times must respect 14-hour windows. (2) Use truck stops with showers and amenities for 10-hour off-duty breaks. (3) The 30-minute break can be the most strategic — eat, fuel, rest at hour 8 not hour 11 to maximize remaining drive time. (4) Sleeper berth split provision is underutilized — properly executing a 7+2 or 8+2 split can extend the same trip by half a day. (5) The 34-hour restart should be planned at home (or familiar location) to maximize quality rest. (6) Always check the ELD displaying the correct duty status — bouncing between off-duty and on-duty-not-driving while at a shipper costs significant time.

2017: ELD mandate took effect — paper logs no longer permitted for most carriers. 2020: HOS reform included flexibility for 30-minute break placement, expanded short-haul exemption, and modified sleeper berth provision. 2024: Personal Conveyance rules clarified — drivers can move the truck for personal reasons (off-duty) within certain limits without affecting HOS clocks.

ELD record (electronic logging device), DOT 100 Driver's Daily Log (legacy paper)