The proliferation of private cars in a city aggravates the air pollution in the city, and often causes serious congestion on several road sections during the morning and evening rush hours
In order to solve this problem, the city government decided to impose round-the-clock traffic restrictions on private cars with single and even numbers, that is, only private cars with odd numbers are allowed to travel on odd-numbered days, and only even-numbered private cars are allowed to travel on even days
Private car owners in the city generally have two or more private cars