Fernando Trebien <fernando.trebien@gmail.com> writes:
Would mapping boundary=urban [1] help solve the problem of assigning a slower estimated speed to ways within dense urban areas in routing apps such as mkgmap? [2][3] It looks like an elegant solution to this problem that would not have the same issues with verifiability that maxspeed:practical has. It is currently common only in France (see an example in Rennes [4]) and there is official data available in my area that could be imported into OSM. [5]
I don't see why drawing a line that encloses the area where you think maxspeed:practical is low is any more verifiable. You are tagging about an area where people drive slower than the speed limits, I think. So it's really the same thing. Also, maxspeed:practical is easy to verify. Drive on the road 10 times and see what the average speed you actually went is. I have lots of commuting data and someday, I will process it and see what the distributions look like. If there really are speed limits, then by all means tag them.