There were and I beleive still are Trucking Companies out there who do go around to scholls and actually let students ride in the truck,around the area so they can see what is like to have to handle and negotiate the traffic around them. Semis especially, take a lot of concentration and work, that's just constantly staying aware of what is not only going on around you but the traffic ahead of you. You are constantly planning how you will take your next turn, how to negotiate raffic, watching for people to suddenly cut you off, and avoiding accidents. It is a very mind exhausting, mental processing job , along with keeping control of the truck should an emergency arrive . If a truck experiences mechanical problems on the road they have to safely get it off the road. Lose you air which trucks have air brakes, can be a major problem. You have to know the skills to keep that truck brakes from locking up and causing possibly a major fatal acident. It is not a glamorous job, and anyone who states it is a Know a Dr. for you!!