What are the official duties for follow me car..for example in beirut airport..it is requested to arrest the people or vehicles who violate the rules..like when driving out of the service roads ..or oersonnel when walking 0ut of service road...also for any obstructions on runways ir taxiways..etc...so as an airtraffic controllers. We are having lot of arguments on this issue..is there icao document that specify the follow me car duty????