NC CDL General Knowledge Practice Test

Under-inflated tires can lead to a fire in a vehicle primarily due to the excessive heat generated as the tire rolls and flexes more than it should. When tires are under-inflated, they do not maintain their shape properly, which increases friction between the tire and the road. This friction can cause the tires to heat up significantly. If the heat builds up to a certain point, it can lead to a blowout or even ignite a fire, particularly if the tire is worn or damaged. In contrast, low fuel levels do not directly cause a fire, as it is the presence of fuel in the wrong situation combined with an ignition source that generally leads to fire risk. High tire pressure can pose its own risks, such as blowouts, but it does not typically contribute to fires. Cold weather generally reduces the risk of tire fires, as it tends to stabilize the temperature of the materials involved, making the occurrence of such incidents less likely.