for _,v in pairs(getElementsByType("vehicle")) do
    if getElementData(v, "damageproof")==1 then
        setVehicleDamageProof(source, true)
    else
        setVehicleDamageProof(source, false)
    end
end

addEventHandler("onVehicleExit", root,
function(plr, s)
    if s==0 then
        setVehicleDamageProof(source, true)
        setElementData(source, "damageproof", 1)
    end
end)

addEventHandler("onVehicleEnter", root,
function(plr, s)
    if s==0 then
        setVehicleDamageProof(source, false)
        setElementData(source, "damageproof", 0)
    end
end)

for _,v in pairs(getElementsByType("vehicle")) do
    if getVehicleOccupant ( v ) then
    if isVehicleDamageProof(v) == false then setVehicleDamageProof(v, true) end
    else
        if isVehicleDamageProof(v) == true then setVehicleDamageProof(v, false) end
end

addEventHandler("onVehicleExit", root,
function(plr, s)
    if s==0 then
        setVehicleDamageProof(source, true)
    end
end)

addEventHandler("onVehicleEnter", root,
function(plr, s)
    if s==0 then
        setVehicleDamageProof(source, false)
    end
end)