Method of controlling a platoon combination of a leading vehicle immediately preceding a following vehicle, comprising - equipping said leading and following vehicles with a vehicle longitudinal motion control system and a vehicle-to-vehicle communication system, - wherein the vehicle longitudinal motion control system of each vehicle comprises a processor configured to execute a computer program product and thereby direct the performance of operations comprising: ∘ deriving for each vehicle a current gross combination weight value; ∘ relating the current gross combination weight of said each vehicle to a maximum brake performance value and to a minimum brake performance value derived from a lookup table; - said vehicle-to-vehicle communication system communicating the maximum brake performance value of the leading vehicle from the leading vehicle to the following vehicle; - wherein the vehicle longitudinal motion control system is further configured to ∘ calculate a safe following distance and/or time headway of the following vehicle with respect to the leading vehicle in the platoon, using the maximum brake performance value communicated by the vehicle-to-vehicle system of the leading vehicle; and the minimum brake performance value of the following vehicle; ∘ wherein the minimum brake performance value of the following vehicle is maximized at the maximum brake performance value of the leading vehicle. - equipping said leading and following vehicles with a vehicle longitudinal motion control system and a vehicle-to-vehicle communication system, - wherein the vehicle longitudinal motion control system of each vehicle comprises a processor configured to execute a computer program product and thereby direct the performance of operations comprising: ∘ deriving for each vehicle a current gross combination weight value; ∘ relating the current gross combination weight of said each vehicle to a maximum brake performance value and to a minimum brake performance value derived from a lookup table; ∘ deriving for each vehicle a current gross combination weight value; ∘ relating the current gross combination weight of said each vehicle to a maximum brake performance value and to a minimum brake performance value derived from a lookup table; - said vehicle-to-vehicle communication system communicating the maximum brake performance value of the leading vehicle from the leading vehicle to the following vehicle; - wherein the vehicle longitudinal motion control system is further configured to ∘ calculate a safe following distance and/or time headway of the following vehicle with respect to the leading vehicle in the platoon, using the maximum brake performance value communicated by the vehicle-to-vehicle system of the leading vehicle; and the minimum brake performance value of the following vehicle; ∘ wherein the minimum brake performance value of the following vehicle is maximized at the maximum brake performance value of the leading vehicle. ∘ calculate a safe following distance and/or time headway of the following vehicle with respect to the leading vehicle in the platoon, using the maximum brake performance value communicated by the vehicle-to-vehicle system of the leading vehicle; and the minimum brake performance value of the following vehicle; ∘ wherein the minimum brake performance value of the following vehicle is maximized at the maximum brake performance value of the leading vehicle.