Upon stopping the vehicles, traffic police officers will check the four documents prescribed by the Road Traffic Law, namely: vehicle registration, driving license, certificate of technical safety and environmental standard (for cars), vehicle owners' civil liability insurance. While conducting technical checks of the vehicle, traffic police officers may detect and handle violations related to the driver that are the major causes of traffic accidents such as: drunk driving, drug driving and over-speeding. If no violations are detected, the police will return the papers to the driver.
On the expressway, checkpoints will be established at the two ends or near toll booths. On national highways, traffic checks will be conducted at the Traffic Police Station, toll booths, or certain points on the roads in line with the Road Traffic Law and without negative impacts on traffic flows. On mountainous roads, the Traffic Police will conduct checks at the foot or on the top of the slope.