[Threshold]

pawn Код:

public OnVehicleStreamIn(vehicleid, forplayerid)
{
    if(vehicleid == DealerShipVehicle) //Replace 'DealerShipVehicle' with your bike etc.
    {
        SetVehicleParamsForPlayer(vehicleid, forplayerid, 0, 1);
    }
    return 1;
}

Sources:
https://sampwiki.blast.hk/wiki/SetVehicleParamsEx
https://sampwiki.blast.hk/wiki/SetVehicleParamsForPlayer
https://sampwiki.blast.hk/wiki/OnVehicleStreamIn

EDIT: However, player's will not get a message when they attempt to enter it. (Because they can't even attempt to enter it). Although you can use OnPlayerEnterVehicle to show the message regardless.