at a relatively low engine speed fig3 shows a schematic flow chart of a method for adapting the starting gear of an automated manual transmission in a heavy vehicle according to the invention the method is performed by the arrangement comprising a control unit and means for detecting a movement behaviour of a vehicle in front of the heavy vehicle in step 100 the vehicle is halted and is standing still the drive selector is in drive mode and the clutch of the automated manual transmission is disengaged such that there is no driving connection between the engine and the gear box of the vehicle the transmission control unit receives information from other vehicle control units 2 regarding different vehicle parameters that will influence the start cycle of the vehicle and may also receive information regarding ambient conditions a pre selected starting gear is determined from this information by the transmission control unit 5 in this example gear 5 will be the pre selected starting gear in step 110 the transmission control unit receives information regarding the movement behaviour of the vehicle in front the information is in this example obtained from a radar mounted in the front of the vehicle and forwarded to the transmission control unit from the adaptive cruise control unit the signals obtained from the radar are used by the adaptive cruise control unit to determine the movement behaviour of the vehicle in front the movement behaviour of the vehicle in front may also be determined directly in the radar unit or in another control unit it is also possible to let the adaptive.