一线公安人员,如交警和巡警,每天都驾驶着摩托车或是警车在路上执勤,处理交通违法行为,截查来往车辆。他们非常需要迅速得到一些有关车辆及驾驶员的信息。目前,一线公安人员一般使用对讲机或手机与总部联系,因此只能得到语音信息或有限的信息,而无法得到确切和 Front-line public security personnel, such as traffic police and patrolmen, drive motorcycles or police cars on the road everyday to handle traffic offenses and intercept vehicles coming and going. They need to quickly get some information about vehicles and drivers. Currently, front-line public security officers generally use walkie-talkies or cell phones to contact their headquarters so that they can only get voice messages or limited information and can not obtain accurate and