According to the traffic big data monitoring, the central city bridge and tunnel traffic vehicles in foreign cars accounted for more than 7%, the average daily traffic volume reached 100,000 vehicles / day. In order to ensure that the effect of the staggered passage is maximized, inhibit the purchase of cars through the field to avoid the staggering of the household and other situations, so the synchronization of the implementation of the staggered passage of the foreign car.