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Currently these are two settings: Maximum bridge length & Maximum tunnel length
A setting that allows you to build longer bridges than originally intended.
When you enable this patch, you can make some bridges 100 tiles long. This is only possible with bridges that normally have a maximum length of at least 16. You also have to take into account that the price for longer bridges dramatically increases. This patch extends the wooden bridge, the steel suspension bridges, and the tubular bridges.
This feature is disabled by default. You can enable this patch through the configure patches -> construction window or use the following syntax in openttd.cfg:
longbridges = true