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Truck drivers are paid according to many different methods. A driver who owns and operates a dump truck locally and works casually or contractually may be paid per hour, and/or per load or ton hauled. Few if any opt to be compensated per mile.
Truck drivers also use flashing headlights to warn drivers in the oncoming lane(s) of a police patrol down the road. Though not official, two consecutive flashes indicate a police patrol, whereas a rapid series of flashing indicates DMV or other law-enforcement agency that only controls truck drivers. During the day time, the latter is sometimes accompanied by the signaling driver making a circle with both hands (as if holding a  tachograph  ring).
Truck drivers provide an essential service to  industrialized  societies by  transporting  finished  goods  and  raw materials  over land, typically to and from  manufacturing plants ,  retail  and  distribution  centers. Truck drivers are also responsible for inspecting their vehicles for mechanical items or issues relating to safe operation. Others, such as driver/sales workers, are also responsible for  sales  and  customer service .
Truck drivers are responsible for checking the axle and gross weights of their vehicles, usually by being weighed at a truck stop scale. Truck weights are monitored for limits compliance by state authorities at a  weigh station  and by DOT officers with portable scales.