Will your research end up in a data check?
Been looking at the HighwayGraph vertex label simplification routines.
The other stuff I spammed the forum with today
(there will be more coming; that was, like... 1/3 of it?) could maybe become a datacheck, but it wouldn't be easy.
Tweak the parts that detect where a route name/number ends in a waypoint label, look at the diffs in waypointsimplification.log, and there's a bunch of stuff like that.
This item's different; found it when looking at points listing different directional suffixes for the same route. This would not make a good datacheck; there'd be way too many false positives.