TRAFFIC SIGNAL-BASED ROAD PROJECTION METHOD AND SYSTEM
FIG5 is a schematic diagram of a specific embodiment of application of the present invention to a map 
The road projecting system for a traffic light provided by Embodiment 3 and Embodiment 4 of the present invention can be independently used, and can also be used in combination with the vehicle navigation system, which can be adaptively adjusted according to requirements of customers. FIG5 is a schematic diagram of a specific embodiment of application of the present invention to a map. As shown in FIG5, the current state of the traffic light is a passable signal light 501, and its remaining time is 5 s. The time period of the traffic light is 35 s, where the time of the passable signal light 501 is 20 s, the time of an impassable signal light 502 is 15 s, and the preset speed is 60 km/h. Projection of the traffic light on the road includes a passable region 503 and an impassable region 504, and a vehicle 505 is also displayed on the road. As shown in FIG5, the vehicle 505 is travelling in the impassable region, and at this time, the driver is prompted to accelerate or decelerate according to the speed of the vehicle 505, the preset speed and the road limited speed in order to ensure that the vehicle passes through the signal light intersection ahead at a passable signal light state.
schematic diagram
502
impassable signal light
501
passable signal light
504
impassable region
505
vehicle
503
passable region
['1. A road projecting method for a traffic light, wherein the road projecting method comprises: acquiring a current state and a time period of a traffic light on a road, wherein the time period is a time for one alternative change of a passable signal and an impassable signal; determining a passable region and an impassable region of a vehicle travelling on the road according to the current state and the time period of the traffic light and a preset travelling speed of a vehicle, wherein the passable region indicates that a corresponding traffic signal is the passable signal when the vehicle travelling in the passable region reaches a traffic light intersection on the road; and the impassable region indicates that the corresponding traffic signal is the impassable signal when the vehicle travelling in the impassable region reaches a traffic light intersection on the road; displaying the passable region on the road of a map in a first manner; and displaying the impassable region on the road of the map in a second manner, wherein the first manner is different from the second manner.']