UCI CYCLING REGULATIONS  Occupants of vehicles shall, in all circumstances, comply with the instructions given by  the commissaires who shall, in turn, do their utmost to facilitate the manoeuvres of the  vehicles.  Only one vehicle at a time shall be allowed to penetrate the bunch regardless of the size  of the bunch.  During Olympic Games, only the vehicles mentioned below shall be authorised to drive  in the race:  11.  a maximum of three camera motor-cycles and one sound motor cycle  10.  the nations’ cars, plus four neutral support cars and one neutral support motor- cycle  9.  the police car  8.  two ambulances  7.  the doctor's car  6.  the UCI technical delegate’s car  5.  the organizing committee manager’s car  4.  the fourth commissaire’s car  3.  the third commissaire’s car  2.  the second commissaire’s car  1.  the car of the president of the commissaires panel  18.  the broom wagon;  17.  the police motor-cycles;  16.  the time board motorcycle;  15.  the doctor’s motorcycle;  14.  the two information motorcycles;  13.  the regulator(s)’ motorcycle(s);  12.  the two photographers’ motorcycles;  11.  the two commissaire’s motorcycles;  10.  a maximum of three camera motor-cycles and one sound motor cycle;  9.  the nations’ cars plus four cars and one motorcycle providing neutral support;  8.  the police car, if necessary;  7.  two ambulances;  6.  the doctor’s car;  5.  six UCI cars;  4.  the fourth commissaire’s car;  3.  the third commissaire’s car;  2.  the second commissaire’s car;  1.  the car of the president of the commissaires panel;  2.3.023 During world championships, only the vehicles mentioned below shall be authorised to  drive in the race:  2.3.022 No vehicle may overtake the riders in the last 10 kilometres.  2.3.021 If a group of riders breaks away from the bunch, their follower vehicles may not slip in  between the break-away riders and the following group without the authorisation of the  commissaire, if and for as long as he considers the gap sufficient.  E170421  ROAD RACES  41  2.3.020 Any driver wishing to overtake a commissaires’ vehicle on his own initiative shall draw  level with those vehicles, state his intention and proceed only once granted official  permission by the commissaire. He shall then complete his business as expeditiously as  possible and return without delay to his place in line. 