What 393.118D3 means in plain language
When you're hauling boulders or large rock loads, federal regulations require them to be secured according to specific rules designed to keep them from shifting, rolling, or falling during transport. A 393.118D3 citation means an inspector found that your boulders were not properly restrained—whether that's loose tie-downs, inadequate blocking, insufficient load distribution, or other securement failures that violate the cargo securement standards.
This isn't a minor housekeeping issue. Unsecured boulders create a serious hazard to you, your equipment, and other drivers. A shifting boulder load can destabilize your trailer, damage your vehicle, or worse. Inspectors treat this violation seriously because the risk is immediate and tangible.
What our enforcement data actually shows
Our inspection records show that 393.118D3 is an uncommon citation overall—17 all-time citations across 13 million inspections puts it at rank #2011 of 3,036 FMCSR codes by citation volume. However, when this violation is cited, the consequences are severe. Across our entire database, 100.0% of 393.118D3 citations result in an out-of-service order. Every single one. That compares starkly to the all-FMCSR average out-of-service rate of 31.4%.
In the last 12 months, we recorded 8 citations for this code. Over the last 90 days, there has been 1 citation. While the raw volume is low, the enforcement pattern is unambiguous: inspectors will not allow improperly secured boulders to continue down the road.
Who gets cited most
Our data shows that North Carolina has seen the most enforcement activity for 393.118D3 in the last 180 days, with 2 citations and both resulting in out-of-service orders (100.0% OOS rate).
Looking across all-time citations by carrier, our data shows fleets such as Howes & Howes Trucking Inc (USDOT 269920) with 2 citations for this violation. The remaining carriers in our enforcement records each have 1 citation. This is not a pattern concentrated in any single fleet; it's scattered across the industry, suggesting that boulder securement failures can happen to any operation that hauls this commodity.
How severe is this compared to similar codes
Code 393.118D3 sits in the Vehicle Maintenance category. To put its severity in context, consider these related codes:
393.9(a) — Inoperable required lamps has seen 660,737 citations with a 15.4% out-of-service rate. That's a far higher citation volume but much lower enforcement consequence rate.
396.3(a)(1) — Inspection/repair/maintenance - general has 236,919 citations with a 45.3% out-of-service rate—roughly comparable enforcement intensity, but this code applies to a much broader range of maintenance issues.
393.47E — Slack adjuster defective has 180,363 citations with 0.0% out-of-service rate. Even though brake adjusters are safety-critical, they're enforced more as correctable defects.
The 100.0% out-of-service rate for 393.118D3 is extreme. Inspectors treat unsecured boulder loads as imminent hazards requiring immediate removal from service, not issues to be corrected and re-inspected.
How to avoid it
Pre-trip inspection checklist:
-
Verify tie-down count and condition. Count your straps, chains, or binders before loading. Check for fraying, corrosion, bent hooks, or wear. Replace anything questionable.
-
Inspect blocking and bracing. Make sure blocking material (wood, plastic, or other approved media) is in place and will prevent boulder movement in any direction—forward, backward, side-to-side, and vertical.
-
Check load distribution. Ensure boulders are not stacked unevenly or concentrated on one side of the trailer. Uneven weight distribution makes shift more likely.
-
Test restraint tension. Apply manual pressure to boulders to confirm they don't shift. Straps and chains should be tight enough that there's no play.
-
Document the secure load. Take photos of the secured load before departure. If you're stopped, this visual evidence supports your case.
-
Know your vehicle's load rating. Verify that your trailer's configuration is rated for the weight and type of load you're carrying. Overloading increases shift risk.
-
Review carrier requirements. If you drive for a fleet, confirm they have written securement procedures specific to boulder loads. Some operations have tighter standards than the minimum federal requirement.
The 100.0% out-of-service enforcement rate means there is no margin for error here. Treat boulder securement as non-negotiable.