When the red alert for heavy air pollution is activated, odd and even driving measures will be implemented. 30% of the total number of vehicles will be stopped on the basis of the even and odd driving measures. Construction waste, muck, sand and gravel transport vehicles are prohibited from driving on the roads within the administrative area of the city throughout the day. The city has suspended the implementation of regional traffic management measures during peak hours on weekdays. The following motor vehicles are not subject to the traffic measures: Police cars, fire cars, ambulances, public trams and engineering rescue vehicles.