Since the novel coronavirus is mainly spread through droplet transmission and contact transmission, the following behaviors when riding in a car will increase the risk of infection: 1. not doing personal protection: not wearing a mask properly, not wearing gloves and touching public objects at will, eating and drinking in the car, touching mouth, eyes and nose with hands; 2. not mastering the safe distance: getting too close to other passengers, talking with the driver or passengers in the car; 3. not doing ventilation and disinfection: not opening windows for ventilation when windows can be opened, using cell phones and personal belongings in the car, but not disinfecting the hands and objects used after getting off.