What 397.67(b) means in plain language
FMCSR 397.67(b) requires drivers and carriers transporting radioactive materials to follow specific routes designated by federal regulations. These aren't arbitrary restrictions—they're safety corridors designed to minimize public exposure in case of an incident.
When you're moving radioactive cargo, you can't simply take the fastest route or your usual highways. The DOT has pre-approved routing maps and procedures for radioactive shipments, and 397.67(b) mandates compliance with those designated paths. This includes checking routing guidance before you depart, understanding which roads are prohibited, and documenting your actual route taken during transport.
Failures typically involve either not consulting the required routing information before departure or deviating from the prescribed route during transport without proper authorization.
What our enforcement data actually shows
Across our 13 million+ roadside inspection records, 397.67(b) is extremely rarely cited. We have recorded 2 all-time citations for this violation, with 0 citations in the last 12 months and 0 in the last 90 days. This code ranks #2651 of 3,036 FMCSR codes by citation volume.
Neither of the 2 citations on record resulted in an out-of-service placement, giving this code a 0.0% OOS rate. For context, the all-FMCSR average OOS rate is 31.4%, meaning radioactive routing violations almost never trigger immediate removal from service at roadside. This suggests that when inspectors do encounter this citation, they're typically addressing documentation or routing-plan issues that don't render the vehicle immediately unsafe to operate.
Who gets cited most
With only 2 all-time citations, individual state and carrier data is extremely limited. Our records show that citations under this code have been distributed across multiple carriers, including operations such as FUEL SOUTH EXPRESS LLC (USDOT 362702) and ACE TRANSPORTATION INC (USDOT 3396641), each with 1 citation. The scarcity of enforcement here reflects how specialized radioactive material transport is—only carriers with specific DOT registrations and credentials handle this cargo type.
How severe is this compared to similar codes
Within the hazardous materials category, routing and documentation violations sit at the lower end of enforcement frequency and severity. For comparison:
- General loading and unloading hazmat violations (177.834A-HMC and 177.834(a)) have generated 3,954 and 3,839 citations respectively, with OOS rates of 99.2% and 97.9%—far more stringent enforcement outcomes.
- Placarding violations (177.817(a)) show 2,274 citations with a 75.1% OOS rate, indicating much stricter roadside consequences.
- Emergency Response information maintenance (172.602(c)(1)) has 1,464 citations but a 0.0% OOS rate, similar to 397.67(b)'s enforcement pattern.
The contrast illustrates that routing documentation issues are treated as lower-severity compliance problems compared to cargo handling or placard defects.
How to avoid it
Since radioactive material transport is highly specialized, prevention depends on carriers with hazmat credentials implementing robust pre-dispatch procedures:
- Obtain and review routing guidance before departure. Consult the DOT Hazmat Routing System or your carrier's routing protocols for the specific origin and destination. Do not assume any route is acceptable—confirm it against current approved corridors.
- Document your planned route in writing. Keep a copy of the routing authorization or approved map in your cab. Inspectors expect to see evidence that you consulted routing requirements before starting your trip.
- Avoid prohibited highways and areas. Certain interstates, tunnels, and populated zones are off-limits for radioactive shipments. Familiarize yourself with local restrictions in your region before accepting a radioactive load.
- Report deviations immediately. If construction, weather, or traffic forces you off the prescribed route, contact your dispatcher and document the reason and the alternate route taken. Do not make routing decisions independently.
- Complete pre-trip inspection for hazmat equipment. Even though 397.67(b) is routing-focused, ensure your vehicle's hazmat placards, labels, and documentation are secure and legible before you depart, reducing the likelihood of secondary violations during inspection.