No, the problem is that it's one roadtype using the graphics of two different roadtypes to create the illusion of different roadtypes in different town zones (sett pavement in the city center and dirt roads on the outskirts). It's a bit of a hack to create some variety at game start, before towns have a chance to naturally build out different roads. There is no issue with the dates, just that the speed of these "rural" town road graphics is slightly higher than the equivalent one that the player can build.
I could always make that the other way round of course, so the town roads have the lower of the two speeds. Or I could make dirt and sett roads have the same speed limit, although then there's not much point in ever upgrading to the more expensive option, so not sure about that idea. Really the problem boils down to there currently not being any way to visually distinguish these "old town roads" from the "normal" ones, so it creates confusion about speeds being different despite looking identical. I guess I need to alter the graphics slightly so the player knows which roads are the "old" ones and which ones have been upgraded by the players.