[DJDhan]

Under your carfix command:

Код:

new Float:Velocity[3];
GetVehicleVelocity(GetPlayerVehicleID(playerid), Velocity[0], Velocity[1], Velocity[2]);
if(Velocity[0] != 0 || Velocity[1] != 0 || Velocity[2] != 0) return SendClientMessage(playerid,0xffffffaa,"Your car needs to be stationary in order to use this command");

Gives you an idea.