Working as intended. Pull points are spread out regardless of traffic signs.
It is easiest to either chose Pull points or traffic signs as a way to manage your logistics.
OK, thank you for reply.
Though I would like to point out that in current state of the game you're best using both pull points (either auto or manual) AND traffic signs, personally I had experience from broken logi to fixed logi (4k throughput -> 6k) just by managing pull points + traffic signs GIVEN I already had good chunk of traffic signs just never care to dig deep.
So the game itself, given how important is logistic, incentifies player to use both to acheive +50-100% efficiency over using just one way. The simpliest case is obvious: if we have fat, like 6k, route and have a branch with civilian asset requiring you 50 logi points, resolving this need via a traffic sign would mean directing 5% or 300 logi to a 50 logi demand, thus wasting 250. It might sound a minor thing, but when accumulated over dozens of rural assets throughout the empire it really takes a toll.
So despite this one issue is not of big importance, I think there is a good reason for pull points and traffic signs work together and have some form of interaction.