Several factors determine whether the system is good or not
. First is that the system must be compatible with the current information system and be interactive with information on the road as well. Thus,drivers can be reminded to be prevented form accidents with the accessorial digital systems. Second is that the interaction between the auto lights systems and the monitoring systems. It should be equipped with information of the traditional signal lights and should able to exchange information of this kind among autos. Therefore, lights at the rear of the car will get the prompt information and calculate the distance between the two cars. Third is that the compatibility of the road instruction system. GPS is not necessary in this system because the whole navigation in the city is given to the digital communication traffic systems and the electronic road instructive systems. As a result, drivers will be ensured to avoid rush hour and will have an easy driving on an optimized road. Related chip is: MAX7528.