While transporting a placarded hazardous-material load, when must the driver examine every tire?
Correct answer: D – At the beginning of the trip and whenever the vehicle is parked
Federal rules require the driver to examine each tire at the beginning of every trip and each time the vehicle is parked. This includes tires in a dual-wheel assembly. A leaking, flat, or improperly inflated tire must be addressed as required before continued operation, subject to the limited allowance for reaching the nearest safe repair location.
Source: Tennessee Commercial Driver’s License Manual — § 9.6.9, “Check Tires”, 49 CFR § 397.17(a)–(b) – Tires

