I just added some max_speed= tags for #OpenStreetMap in Bloomington, Indiana.
Our city code has a default speed limit 25 mph. Exceptions are published in a table in the city code.
It seems possible that adding the correct lower-than-default speed limits from city code to OpenStreetMap could reduce the likelihood that routing algorithms would route car traffic there, which could in turn keep the street safer for other road users.
Ref: https://library.municode.com/in/bloomington/codes/code_of_ordinances?nodeId=TIT15VETR_CH15.24SPRE
Please don’t litter OpenStreetMap with false data to manipulate routing.
@superkret No one was suggesting that.
@superkret I filled in some missing values based on correct values found in city code.
@markstos @bloomington_in on the other side, bike routing likely gets better too
@DemonHusky @markstos @bloomington_in Bike routes will get more direct, but “better” may not be applicable, since the more direct routes also encourage drivers to speed
That said cities tend to add bike lanes only after people get annoyed with bike traffic, so maybe down the road it might add some lane miles
@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.
@markstos @DemonHusky @bloomington_in
What DemonHusky said:
A map app suggesting a route for a bike will try to minimize time via the slowest streets. For a car, it will try to minimize time via the fastest streets (which are usually more direct in terms of distance)
So if the algorithm suggesting a route thinks all streets are the same speed, bikes and cars will be suggested the same low-distance routes, which will usually be routes featuring excessive speeding by drivers
@markstos @pleaseclap @bloomington_in without knowing the local area, I was thinking not that there might be basically parallel routes with different speed limits, and car routing would choose the higher limit option, while bike routing chooses the lower limit option. But with the assumption that the limits reflect something else about the road condition and how comfortable biking is, the routing algorithm now has a better signal to choose the better route
