[OSM-talk] A warning about gates and other barriers

[Nic Roets]

Hello,

I see a lot of frustration with routing not working when there are
gates involved. In particular when the gate is in the middle of a
public road (residential). This is because a gate with no access tags
implies that nothing can go through. By contrast, most highway types
let some type of traffic through. For routing purposes. it often
creates islands, where some segments can't be reached from the rest of
the routing graph.

For example, much of this service road is cut off.
http://www.openstreetmap.org/?lat=49.2214151&lon=18.7401969&zoom=18

Is there perhaps a worldwide tool that can identify these segments ? I
tried keepright and the cloudmade debug map, but neither of them show
it.

Here is a more extensive description of the tagging of restricted areas:
http://wiki.openstreetmap.org/wiki/Osm.org_Routing_Demo#How_to_tag_restricted_areas

Regards,
Nic