Federal Rules for Stalled Trucks, Brakes and Tires
Warning a stopped truck
When a commercial vehicle stops on a highway lane or shoulder, the driver must turn on the hazard flashers at once and, within 10 minutes, set out warning devices at about 10 feet and 100 feet behind the truck and 100 feet on the other side (49 CFR 392.22). A stalled rig on the I-15 grade without triangles is a common cause of rear-end crashes.
Hills and curves
If the truck stops within 500 feet of a curve or hill crest that blocks the view, the warning signal must be placed 100 to 500 feet back toward the obstruction to give approaching drivers time to react (49 CFR 392.22(b)(2)(iv)). The rise at the Point of the Mountain makes this rule especially relevant.
Equipment the driver must check
No commercial vehicle may be driven unless the driver is satisfied that its service brakes, trailer brake connections, steering, lights, tires, mirrors and coupling devices are in good working order (49 CFR 392.7). A brake failure on a descent often traces back to this check.
Tire condition
Trucks may not run on tires with exposed ply, tread separation or an audible leak, and front tires need at least 4/32 inch of tread depth (49 CFR 393.75). A blowout that sends a truck across lanes calls for inspecting the tire itself. Our Utah truck accident guide covers how that evidence is preserved.
When a truck does not stop
If a truck forces you off the road or sheds debris and keeps driving, your uninsured motorist coverage may respond. If it never touched you, Utah Code § 31A-22-305(6) requires clear and convincing proof beyond your own testimony that it existed, so report it immediately and write down anything you saw on the truck.