public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
if ((newkeys & KEY_CROUCH) && !(oldkeys & KEY_CROUCH) && IsPlayerInAnyVehicle(playerid)){
new Seat[MAX_PLAYERS] = GetPlayerVehicleSeat(playerid);
if(Seat[playerid] == 0){
new Float:F[5];
new vehicleid = GetPlayerVehicleID(playerid);
GetVehicleVelocity(vehicleid,F[0],F[1],F[2]);
SetVehicleVelocity(vehicleid,F[0],F[1],F[2]+2);}}
return 1;
}