For construction units, warning lights should be turned on during road construction, otherwise accidents are likely to occur, and unfamiliar people will trip and cause traffic jams.
The car is the same on the road. There will be some problems during the long driving process. You have to stop on the road. In order to ensure safety, the driver must place a warning light to remind pedestrians to slow down or there is an obstacle in front.
Emergency ambulances, fire engines, etc., are equipped with warning lights on the vehicle, which can play a larger role in alerting and alerting passersby.
