along with the rapid economic and social development, China’s large cities, especially big cities, urban development resources have been saturated, and the traffic congestion and parking lot is the common fault of the city.A lot of new parking facilities face space is extremely limited embarrassment, so a new kind of parking pattern, parking lot, PR is very popular in European and American countries, can well solve the heart of the city traffic.So what is PR in the parking lot? title="nantong huanli"