At general intersections, vehicles driving on main roads have priority right of way, and vehicles on branch roads need to avoid vehicles on main roads. When a motor vehicle enters the main road from a branch road, it should avoid the motor vehicle driving on the main road without traffic police command and traffic lights, and let the motor vehicle driving on the main road go first. This is "Avenue first". This is a traffic rule to avoid traffic accidents. ?

The main signs can be divided into four types: ① Indicating signs: generally round and rectangular, with blue background and white pattern. Used to instruct vehicles and pedestrians to drive in the specified direction and place. ② Warning signs: generally equilateral triangle (or diamond), yellow (white) background with black (red) edge, and black (or dark blue) pattern. It is used to warn drivers to pay attention to the dangers of the road ahead and the measures that must be taken. ③ Prohibition sign: generally round, with white background and red edge, black pattern and red diagonal line. It is a sign that vehicles are prohibited or appropriately restricted according to the situation of streets, highways and traffic flow. ④ Guiding signs: generally rectangular, with white characters on blue (green) background. It is used to indicate the boundaries between towns and villages, the direction and distance of destinations, the entrances and exits of expressways, service areas and places of interest. And all kinds of guidance along the way.