Although mechanical failure of big rigs causes trucking accidents, most are caused by driver error. Driver error happens for a number of reasons. It starts with truck carrier companies failing to do comprehensive background checks on new truck driver hires, and failing to give adequate road tests as a condition for employment. This allows drivers with poor driving records to share the road with the general public. Of course, one practice that is impossible to avoid is hiring inexperienced drivers. They fill the gaps created when highly experienced drivers retire. Unfortunately,.