Tractor-trailers can be dangerous vehicles when they are not driven with care. This is partially because they can weigh 20 to 30 times as much as passenger vehicles weigh, they have large blind spots on all four sides and they require long distances when stopping.
Because of these and other challenges, tractor-trailers are operated by specially trained professionals. However, a truck driver’s job can involve many hours driving along monotonous highways with little to no human interaction, and although there are limits on how many hours truckers can work, many truckers feel pressure to drive for longer than they should. To help cope with these challenges, some truck drivers turn to drugs.