Hours of Service Rules (Plain English)
The Hours of Service regulations exist for one reason: keeping exhausted drivers off the road. They're not complicated, but the way FMCSA writes them makes your eyes glaze over. Here's what actually matters:
The Property-Carrying Rules (Most Drivers)
- 11-Hour Driving Limit — You can drive a maximum of 11 hours after 10 consecutive hours off duty.
- 14-Hour Window — You cannot drive beyond the 14th consecutive hour after coming on duty, following 10 hours off. Driving is done after 14 hours even if you didn't use all 11 drive hours.
- 30-Minute Break — You must take a 30-minute break after 8 cumulative hours of driving without at least a 30-minute interruption.
- 60/70-Hour Limit — You cannot drive after 60 hours on duty in 7 consecutive days, or 70 hours in 8 days. Most carriers use the 70/8 cycle.
- 34-Hour Restart — You can restart your 60/70-hour clock by taking 34 or more consecutive hours off duty.
The mistake everyone makes: Confusing the 11-hour drive limit with the 14-hour window. You can be OUT of drive time but still ON duty. The 14-hour clock doesn't stop for off-duty breaks (except sleeper berth splits). Plan your day accordingly.
ELD Compliance Made Simple
Electronic Logging Devices replaced paper logs for most carriers in December 2017 (with full enforcement in 2019). If you're driving a CMV that requires a log, you almost certainly need an ELD. The exceptions are narrow:
- Drivers who use RODS (Records of Duty Status) not more than 8 days in any 30-day period
- Driveaway-towaway operations where the vehicle is the commodity
- Vehicles manufactured before model year 2000
Your ELD must be registered with FMCSA, must be able to transfer data to a safety official (via Bluetooth, USB, or web), and must automatically record driving time when the vehicle moves. You're responsible for knowing how to operate it, even if your carrier sets it up.
Roadside tip: If your ELD malfunctions, you have 8 days to get it fixed. In the meantime, you must keep paper logs. Always carry a backup supply of graph grid paper in your cab. Officers don't care about your IT department's timeline.
Pre-Trip Inspection Walkthrough
The pre-trip inspection is the most critical 15 minutes of your day. It's also the most commonly cited violation during roadside inspections. Here's the 7-step method that FMCSA teaches — and that inspectors use when they're watching you:
- Approach the vehicle — Look for leaks, damage, lean. Check for obstructions around the vehicle.
- Check under the hood — Fluid levels, hoses, belts, wiring. Steering components. Water pump. Alternator.
- Start the engine and check inside the cab — Gauges, warning lights, controls, mirrors, windshield, emergency equipment, seat belt.
- Turn off engine and check lights — Headlights, turn signals, 4-ways, clearance lights.
- Walk-around inspection — Tires, wheels, lugs, suspension, brakes, frame, exhaust, coupling devices.
- Check brake lights — Have someone press the brake or use a stick/bungee on the pedal.
- Final check — Air brake test (governor cut-in/cut-out, low air warning, rate of air pressure drop, parking brake test, service brake test).
From the safety office: I've seen more drivers put out of service for tire and brake violations than anything else. Check your tread depth (minimum 4/32" on steer, 2/32" on drive and trailer), check for uneven wear, and know what a dragging brake smells like. These aren't paperwork issues — they're the things that kill people.
CSA Score Explained
The Compliance, Safety, Accountability program is how FMCSA measures your carrier's safety performance. It uses data from roadside inspections, crash reports, and investigation results to generate scores in 7 categories called BASICs:
- Unsafe Driving — Speeding, reckless driving, seatbelt, distracted driving violations
- Crash Indicator — History of crash involvement (DOT-recordable)
- HOS Compliance — Driving beyond hours, log falsification, ELD violations
- Vehicle Maintenance — Brake, tire, light, and other equipment violations
- Controlled Substances — Drug and alcohol violations
- Hazardous Materials — HazMat handling, placarding, and shipping paper violations
- Driver Fitness — Invalid CDL, no medical card, lack of required training
Scores are percentile-based (0-100). Higher is worse. Each BASIC has an intervention threshold — cross it and FMCSA may issue a warning letter, do an investigation, or shut you down. The thresholds vary by BASIC and carrier size.
What most drivers don't know: Violations stay in the system for 24 months, weighted by severity and recency. A violation from last month hurts more than one from 18 months ago. One clean inspection washes out a lot of damage over time. If you get inspected and it's clean, make sure the inspector files the report — clean inspections count in your favor.
Weigh Station Survival Guide
Weigh stations aren't random. Understanding how they work takes the anxiety out of them:
- PrePass / Drivewyze — If your carrier has a transponder and your safety record is good, you'll often get a green light to bypass. This is one of the best perks of running with a clean carrier.
- Scale procedure — Pull onto the scale at idle speed, don't brake on the scale, wait for the signal. If you get a red light, pull into the inspection area. Stay calm.
- Level 1 inspection — The full deal. They're checking your truck, your trailer, your paperwork, AND you. Have your CDL, medical card, registration, insurance, permits, and ELD display ready.
- Overweight — Federal bridge law sets max gross at 80,000 lbs. Individual axle limits vary. Know your axle weights before you hit the scale. Some truck stops have CAT scales — use them. The $12 is cheaper than the $500+ fine.
The unwritten rule: Don't try to go around an open scale. DOT officers can and do radio ahead. Bypassing an open station is an automatic inspection with a much less friendly officer. Just roll through.