Semi-trailer driving on the road and sub-road driving and parking.1, on the road maintenance work: check the engine and chassis have no abnormal sound and odor;Check the working condition of the clutch;Check the working condition of the brake;Check the working condition of steering mechanism;Check the working condition of each instrument.

2. The main work of the semi-trailer on the way to stop is: check the appearance and air pressure of the tire, remove the inclusions between the twin tires and the tread lines;Check whether there is oil leakage, water leakage, air leakage and electricity leakage phenomenon;Check whether the brake has drag phenomenon and the working condition of the hand brake;Check whether steering mechanism, control mechanism and other connecting parts are firm;Check whether the cargo loading is safe and reliable;Check whether the towing device is safe and reliable;Check whether the brake drum is hot.