the speed limit traffic sign, also known as the speed limit sign, indicates that the speed of the vehicle is not allowed to exceed or lower than the value of the traffic sign above the traffic sign in the road section where the speed limit is removed from the traffic sign or another traffic sign with different speed limit value. The speed limit traffic sign needs to be set at the starting point of the section that needs to limit the speed. The faster the vehicle travels on the road, the larger the size of the speed limit traffic sign will be.
the speed limit traffic signs include high speed limit traffic signs, low speed limit traffic signs and lift the speed limit traffic signs, which are mainly used on highways and urban roads. High speed limit traffic signs are set up through the section later to control the highest vehicle speed, to avoid the occurrence of traffic accidents caused by speeding; Low speed limit traffic signs refers to some high-speed sections or urban fast sections, in order to prevent the vehicle speed is too low, but cause traffic accidents set up low speed traffic signs, set up after the vehicle speed can not be lower than the value on the sign; the lifting of speed limit traffic signs is due to changes in some road conditions, so the temporary setting of speed limit traffic signs, general road conditions will be set up to lift the speed limit traffic signs.