[Ironboy500[TW]]

Код:

public OnPlayerStateChange(playerid, newstate, oldstate)
{
    if(newstate == PLAYER_STATE_DRIVER && GetPlayerVehicleID(playerid) == VEHICLEID_WHO_YOU_WANT)
    {
    SendClientMessage(playerid, 0xFFFFFFFF, "This Vehicle is restrict for admins, get out!");
    RemovePlayerFromVehicle(playerid);
    return 1;
    }

    return 1
}

Replace VEHICLEID_WHO_YOU_WANT with vehicle id you want message to show up for.