Fix road pathfinder behaviour with speed limits on roadtypes/bridges #8710
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Motivation / Problem
#8594
Also noted that road vehicles were always picking wooden bridges over faster ones, regardless of whether the (slightly) longer route was better or not.
Description
Get the speed limit from the roadtype if there is one, same as for railtypes.
Account for bridge length in path cost calculation, same as is done for rail
Limitations
Might change/break some existing setups? Possibly?
Path cache can take a few months to fully clear for some road vehicles.
I don't think it's perfect yet. Road vehicles still seem to pick the an unexpected path sometimes - the wooden bridge is still being chosen more often than I'd expect
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.