Risk assessment is the approach to identify hazard and implement proper controls to reduce likelihood.
When doing so, we should look at the portion that must be function well to support the intended outcome.
In the illustration, the vehicle is to transport people or goods from one location to another. The engine and tires must be in good condition with sufficient fuel plus cooling fans to achieve this purpose. Any one of these components fails will affect the intended outcome.
Therefore, vehicle (especially commercial) needs to undergo regular inspection and maintenance to keep in good condition. Check the tires and fuel capacity before any trip to reduce the likelihood of break down. Having spare tires or road-side assist contact numbers are the mitigation under assumption that the cellular phone signal coverage is within the trip. Otherwise, a different support model (say, satellite phone) is required..