With the rapid development of China's economy, the number of vehicles has a sharp increase. It led to the traffic problem becoming more and more serious, with the problems of traffic congestion, easy to cause accidents, solving the accident no in time and so on. For the current traffic congestion problem, the paper designs a traffic warning and monitoring platform based on IoT technology. It takes advantage of computer technology, communication technology, sensor technology and so on, connecting together vehicles with the side of road infrastructures over wireless network, and finally we can know the status of the entire cars' on the monitoring platform which is at road junction. It can shorten the time of finding and dealing with accidents, improve the overall efficiency, reduce operating costs and facilitate people's life.
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