setTimer(function()

    local vehicles=getElementsByType('vehicle')

    for _, vehicle in pairs(vehicles) do

        if getElementHealth(vehicle)<300 then

            setVehicleDamageProof(vehicle, true)

        elseif getElementHealth(vehicle)>301 then

            if getVehicleController (vehicle) then

            setVehicleDamageProof(vehicle, false)

            end

        end

     end

end, 500, 0)