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Road infrastructure counts are not updated properly, free money exploit with infrastructure maintenance #7625

James103 opened this issue Jun 15, 2019 · 0 comments


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@James103 James103 commented Jun 15, 2019

Version of OpenTTD


Expected result

Like rail infrastructure, road infrastructure counts should be updated properly when converting to different road types.

Actual result

When you convert road types, the game does not properly change the numbers on the infrastructure piece counts for road, unlike rail. This can lead to:

  • You don't have any infrastructure built but are paying thousands in infrastructure maintenance per year
  • You have some infrastructure built but are not paying anything towards infrastructure maintenance or even getting an idle net profit from infrastructure maintenance.
  • Detailed infrastructure says that you have, for example, "Dirt Road: -100"

Note that all infrastructure counts are fixed on savegame load, so any server where one or more companies fell victim to this exploit just has to 1. save game, 2. load game, 3. reset affected bank balances (optional).

Steps to reproduce

  1. Load any NewGRF providing extra road types (examples: Unspooled, Docklands, RattRoads).
  2. Start new game, with infrastructure maintenance enabled.
    The following steps assume you have RattRoads loaded in your game.
  3. Build some dirt roads.
  4. Convert the dirt roads to highways.
  5. Demolish the highways.
  6. Repeat steps 3 through 5, but on a larger scale each time.
  7. You should be getting lots of money despite having no infrastructure, no vehicles, and a nonnegative loan.

If you repeat steps 3 through 5 in reverse order, then you'll actually end up losing much more than the background loss rate of £300/yr (£25/mo) despite having nothing built, no vehicles, and no loan.

@OpenTTD OpenTTD deleted a comment from EgyLynx Jul 6, 2019
@nielsmh nielsmh added this to the 1.10.0 milestone Sep 1, 2019
@LordAro LordAro closed this in 24bace3 Dec 31, 2019
douiwby added a commit to douiwby/OpenTTD that referenced this issue Apr 16, 2020
spnda added a commit to spnda/OpenTTD that referenced this issue Jun 17, 2020
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