To monitor and effectively control the flow of industrial waste, the EPA has been requiring operators of vehicles that transport hazardous or large amounts of waste to install GPS devices linked to the EPA's real-time tracking system. To date, vehicles carrying 267 listed types of industrial waste are required to have GPS installed. The number of vehicles with such devices has now exceeded the mark of 8,888. In 2001, the EPA announced that vehicles used for transport of listed types of industrial waste should have GPS tracking devices installed in accordance with Article 31 Paragraph 1 Item 3 of the Waste Disposal Act so that industrial waste clearance could be monitored and controlled more effectively. To date, the Act has been amended seven times, and the EPA now requires all hazardous waste produced by listed enterprises to be transported in vehicles with GPS tracking devices. The EPA's tracking system has also been made available to enterprises and other environmental agencies to monitor the movements of listed clearance vehicles and keep track of industrial waste with the help of real-time and historical tracking data. The GPS system automatically flags unusual vehicle movements everyday and sends the data to local government environmental protection bureaus so that they can conduct checks and offer advice where necessary. The system allows local government environmental protection bureaus to set up their own “red alert zones” where illegal dumping could take place and automatically monitor any of the GPS vehicles that enter these zones. Knowing about the system's “red alert zones” should dissuade unscrupulous operators from attempting to dump waste there. Currently there are 8,888 vehicles equipped with GPS that transport 267 types of industrial waste. In terms of distribution of GPS waste clearance vehicles, Taiwan's central region has the most with 29%, the southern region has 27% and the northern region has 20%. Statistics show that nationwide in 2015, approximately 14 million tonnes of industrial waste were transported by these vehicles. Members of the public who wish to learn more about the GPS tracking system can visit the EPA's dedicated web page, enquire at their local government environmental protection bureau, or call the EPA's Industrial Waste Control Center hotline (0800-059-777).