[Tagging] Tagging average speed [Was: Re: Residential roads]
ralf at kleineisel.de
Sun Oct 3 15:49:33 BST 2010
On 10/03/2010 04:17 PM, Anthony wrote:
> You'd also need information about how the average speed was measured,
> when it was measured, how accurate it can be expected to be. When
> different people come up with different measurements using different
> methods, you have to have a method to choose one, or a way to include
> all of them.
That would be the perfect way, but very complicated. Many things in OSM
are subjective. Having a tag which enables us to indicate "this road
normally can be driven at around 60 kph instead of the legal limit"
would be much, much better than nothing. Right now when I make a
routable map for a Garmin GPS I can set the road_class and road_speed
only by looking at the Highway=* tag. This can lead to strange speed
estimates. I think a simple "typical speed" tag would be very nice.
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