A plain-language overview of the federal, state, and local rules that govern commercial truck operations — and what drivers need to stay legal on every leg of every route.
Commercial truck drivers operate under a layered web of regulations from three levels of government. Federal rules set the floor — minimums that every state must meet. States can (and do) add requirements on top. Local jurisdictions add another layer for specific roads, bridges, and zones. A driver crossing multiple states in a single shift must be compliant with all three layers simultaneously.
Hours of Service rules limit how long a driver can operate before mandatory rest. They exist to combat fatigued driving, which is a leading cause of large-truck crashes.
| Rule | Limit | Notes |
|---|---|---|
| 11-Hour Driving Limit | Max 11 hours driving after 10 consecutive hours off | Driving only — does not include on-duty time |
| 14-Hour On-Duty Window | Cannot drive after 14 hours on duty (even if <11 hrs driving) | Clock starts from first on-duty action (pre-trip, fueling, etc.) |
| 30-Minute Break | Required after 8 cumulative hours of driving | Must be off-duty or sleeper berth — on-duty rest does not count |
| 60/70-Hour Limit | 60 hrs in 7 days OR 70 hrs in 8 days | Carrier chooses which cycle; 34-hour restart resets the clock |
| Sleeper Berth Split | Can split 10-hr rest as 8+2 or 7+3 | Both periods must be in sleeper berth; specific rules apply |
| Short-Haul Exception | 14-hr window extends; no 30-min break required | Must operate within 150 air miles; return to home base daily |
As of December 2019, most commercial drivers operating CMVs in interstate commerce must use an FMCSA-registered Electronic Logging Device. ELDs automatically record driving time, engine hours, vehicle movement, miles driven, and location data. Paper logs are no longer acceptable for most drivers.
| Weight Type | Federal Limit | Notes |
|---|---|---|
| Single Axle | 20,000 lbs | Per single steering or drive axle |
| Tandem Axle Group | 34,000 lbs | Two axles within 40 inches of each other |
| Gross Vehicle Weight | 80,000 lbs | Total — tractor + trailer + cargo |
| Bridge Formula | Varies by axle spacing | Federal formula limits weight based on distance between axle groups to protect bridges |
States may issue overweight permits for loads exceeding these limits. Permit requirements, fees, and allowed routes vary significantly by state.
Transporting hazardous materials (hazmat) requires a CDL with H endorsement, additional training, proper placarding, shipping papers, and in some cases special permits. Nine hazmat classes range from explosives (Class 1) to miscellaneous (Class 9). Penalties for hazmat violations are severe — up to $84,425 per violation per day.
Every state has its own Department of Transportation and its own rules layered on top of federal minimums. A driver running from New Jersey to California in a single trip must be compliant in NJ, PA, OH, IN, IL, MO, KS, CO, UT, NV, and CA — each with potentially different requirements.
Mountain states require tire chains or alternative traction devices during winter storms. Requirements vary by state, by road class, and by conditions. California has three traction levels (R1, R2, R3). Colorado, Washington, Oregon, Wyoming, and others each have their own systems. Chain requirements can change in hours — or minutes on a mountain pass.
During thaw season (typically February–April, varying by state and elevation), states reduce weight limits on certain road classes to protect road surfaces from damage caused by heavy loads on frost-weakened pavement. Violations carry heavy fines and can result in being placed out-of-service until the load is reduced.
The International Fuel Tax Agreement (IFTA) requires interstate carriers to report fuel purchases and miles traveled in each jurisdiction. Quarterly reports allocate fuel tax to the states where fuel was burned, regardless of where it was purchased. Accurate fuel and mileage logs are required — which is exactly why CleanShot's fuel log exports in IFTA-ready CSV format.
Oversize or overweight loads require state-issued permits specifying allowed routes, travel hours (often no nights, no weekends, no holidays), and sometimes pilot car requirements. Permits are state-specific — a load legal in Texas may require a different permit in Louisiana. Superloads (extremely heavy or wide) may require engineering studies and escort by law enforcement.
Some states set lower speed limits for trucks than for passenger vehicles. California limits trucks to 55 mph on all freeways regardless of the posted car speed. Other states with differential speed limits include Oregon, Washington, Idaho, and Indiana. Violating CMV-specific speed limits carries higher fines.
The federal minimum vertical clearance on the National Highway System is 16 feet. But thousands of bridges — particularly in older urban areas, on secondary roads, and on rail overpasses — have clearances as low as 9 or 10 feet. A standard loaded trailer runs 13.5–14.5 feet tall. Bridge strikes happen hundreds of times per year, causing millions in damage and occasional fatalities.
CleanShot uses the National Bridge Inventory (NBI) to alert drivers to low clearances ahead, with a mandatory 1.0-foot safety margin. This is not a courtesy warning — it is safety-critical infrastructure data.
Local governments frequently restrict truck traffic on residential streets, near schools, or through certain neighborhoods. These restrictions may be time-of-day based (no trucks 10pm–6am), weight-based (no vehicles over 5 tons), or permanent. Fines range from $250 to several thousand dollars per violation.
Many urban areas restrict how long a truck can idle — typically 5 minutes in California ARB jurisdictions, 3 minutes in New York City, and varying times elsewhere. Fines for excessive idling can reach $500–$1,000 per incident. APUs (Auxiliary Power Units) are the standard solution for drivers who need heat or AC during rest without running the main engine.
Container ports and intermodal rail yards often have their own access rules, appointment systems, weight restrictions, and equipment requirements. A driver showing up at the Port of Los Angeles without a valid appointment or with non-compliant equipment will be turned away — burning hours and fuel with nothing to show for it.
CleanShot's "Am I Legal Here?" compliance check pulls all active regulatory conditions for a driver's current GPS position and truck profile — chain law status, weigh station open/closed, weight restrictions, bridge clearances ahead, hazmat restrictions, and permit coverage — and returns a single clear answer with a timestamped, exportable PDF snapshot.
That PDF is documentation a driver can show at a roadside inspection, attach to a compliance report, or file as proof of due diligence. It also gives fleet managers a real-time view of any driver with an active compliance flag that needs immediate attention.
The regulatory landscape described on this page is genuinely complex. Federal minimums, state overlays, local restrictions, seasonal variations, real-time chain law changes — keeping track of all of it simultaneously while driving a loaded rig is an unreasonable cognitive burden to place on a single person. And yet that's exactly what the industry has expected drivers to manage, mostly on their own, for decades.
We're a newcomer to this space and we know it. But we also know that the trucking industry is the backbone of the American economy and the foundation of the lifestyle most people take entirely for granted. When you flip on a light switch, fill a prescription, or pick up groceries — a truck driver made that possible. They deserve better tools than a consumer GPS and a printed state regulation pamphlet.
That's why CleanShot integrates FMCSA data, Road511 feeds, state DOT sources, and the National Bridge Inventory — not as features to list on a pricing page, but because that's the actual data you need to stay legal from one state line to the next. It's why compliance snapshots are exportable and timestamped — because your due diligence deserves documentation. And it's why we keep every data source updated, because a stale regulation alert is worse than no alert at all.
We're in this for the long haul — because the drivers who are in it for the long haul deserve a company that takes it as seriously as they do.