@superkret I filled in some missing values based on correct values found in city code.

@superkret No one was suggesting that.

@DemonHusky @pleaseclap @bloomington_in Ah, so the correct speed limit needed to be lowered in OSM?

@pleaseclap @DemonHusky @bloomington_in Yes. Many routing services, including Google Maps, use OpenStreetMap data to some degree. The more accurate the data is, in general the better the algorithms can work.

If you know of times where you think you haven’t been given the best bike directions, the issue might be solved by updating something in OpenStreetMap. Which like Wikipedia, anyone can edit and it’s not to hard to get started.

@benfulton @bloomington_in The algorithms don’t know about the debris in the bike lane nor have I heard of carbon monoxide being factored in, BUT the Pointz app allows reporting road hazards and road stress/comfort. But they have few users.

Both Strava and Ride With GPS factor in the routes actually take, so there are options for algorithms that look beyond what’s in OSM data.

@pleaseclap @DemonHusky @bloomington_in In context, the rest of the post says that exceptions are published in city code and provides an example link to the table in our code.

I’m suggesting to use real speed limits from city code. Sorry if that wasn’t clear.

@pleaseclap @DemonHusky @bloomington_in Misrepresentating? I found streets where the max_speed value was missing and added the correct values based on city code.

@pleaseclap @DemonHusky @bloomington_in I’ve looked at the code. My servers have bike routing coverage for most of the US and EU with the OpenTripPlanner and Valhalla engines. Occasionally we find edge cases that don’t route optimally and look into patches.

Lots of roads don’t have max speeds in OpenStreetMap which they both use, so other signals are essential.

@pleaseclap @DemonHusky @bloomington_in That’s right. Many signals are involved. Some factor in cyclist aversion to hills for example.

@pleaseclap @DemonHusky @bloomington_in In the absence of a speed limit signal, the algorithms look for other signals, like the type of road. Cars are routed to arterials over residential streets even they are a bit longer, while bike routing would prefer residential streets.

The Pointz bike routing app is nice because it puts you in control with more options.

@pleaseclap @DemonHusky @bloomington_in I can’t see how any routes will become more direct for anyone, because no new more direct paths are being added.

Tagging a slow speed limit is a signal that cars may want to take a less direct route on streets with faster speed limits, while tagging a high speed limit is a signal for bike routing that cyclists may be less safe and may themselves prefer a less direct but safer route.