Driving a semi-trailer requires mastering special techniques to ensure safety and efficiency. Before departure, check tire pressure (standard values vary depending on the vehicle model), the braking system (brake fluid level is normal, no leaks), and the lighting system (headlights/turn signals are functioning correctly). The condition of these critical components directly affects driving safety. When starting, preheat the engine (3-5 minutes in cold weather), and start smoothly in first or second gear (clutch half-engaged with engine speed at 1200-1500 rpm). Gear changes should match vehicle speed and road conditions; upshifting is recommended when the engine speed reaches 2000 rpm, and downshifting can use the "double-clutching" technique (revving the engine to 2500 rpm) to reduce gear shock. When turning, reduce speed to below 30 km/h in advance, pay attention to the inner wheel difference (the trailer's trajectory shifts by 0.5-1 meter for every 10℃ increase in steering angle), and avoid sudden steering.
When reversing, the steering wheel operation is the opposite of conventional driving (steering correction angle should not exceed 15℃), and it is recommended to have a spotter. Prioritize predictive braking (deceleration controlled within 3 m/s²), and use intermittent braking in emergencies (2-3 times/second). On long downhill slopes, it is recommended to use a low gear (engine speed maintained at 1800 rpm) for auxiliary braking. Different road conditions require specific responses: maintain a distance of more than 100 meters on highways (vehicle speed <= 90 km/h), downshift in advance on mountain curves (3rd gear is recommended for an 8% slope), and reduce speed by 30%-50% in rainy and snowy weather and install snow chains (chain link spacing <= 15 cm).
