A foreign study has even reported that once traffic slows to about 8 miles (13 kilometers) an hour, "the cars disappear" as people switch to public transportation to enter the city.
國外甚至有研究報告指出，當市中心擁擠到車行速度只有八英哩（約十三公里）時，「車輛就不見了！」因為人們乾脆換乘大眾運輸系統進城。