Beijing is not suitable for the development of private cars  the reasons are that its population density is too high and the transportation facilities are backward  Besides, the parking spaces are too few, and the city's road capacity is also limited  The current traffic flow has overwhelmed the city's traffic
The population density and total volume of Tokyo in Japan are no less than that of Beijing. It once had the problem of lagging transportation facilities, but now it is one of the cities with the largest number of private cars in the world, and there are no difficult social problems.
 If private cars are vigorously promoted, it will inevitably cause social problems that are hard to solve