CMD:respawnallcars(playerid,params[])
{
    if(APlayerData[playerid][PlayerLevel] < 3) return SendClientMessage(playerid, 0xFF0000FF, "You are not authorized to use that command!");
    for(new car = 1; car <= 268; car++)
    {
        if(IsVehicleEmpty(car)) SetVehicleToRespawn(car);
    }
    GetPlayerName(playerid, sendername, sizeof(sendername));
    format(string, sizeof(string), "SERVER: All unused cars respawned by %s.", sendername);
    BroadCast(0xFFFFFFFF,string);
    return 1;
}

stock IsVehicleEmpty(vehicleid)
{
    for(new i=0; i<MAX_PLAYERS; i++)
    {
        if(IsPlayerInVehicle(i, vehicleid)) return 0;
    }
    return 1;
}