-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 After doing some routing tests, I found I had been mapping roundabouts in a way that is confusing to routing software. The problem is that when you have a barrier separating the entry and exit lanes of a roundabout, but nothing between an exit lane and the next entry lane (the first exit), like on the west side of the example roundabout, it's very easy to make those two lanes go to and from the same node in the roundabout. This Seems to be confusing for routing purposes, as that node is not counted as an exit.
This is an example: https://www.openstreetmap.org/#map=19/15.15286/120.59208 If you come from the bridge north of the roundabout, going south on MacArthur, Poinsettia Avenue (which name I will double check today) is the first exit, but if the MacArthur Highway entry lane happens to share a node in the roundabout with the Poinsettia Avenue exit, routing software will tend to call that a "right turn", not "first exit in the roundabout". More confusingly, continuing on MacArthur southbound is reported as "Second exit in the roundabout", which may have the unintended effect of directing drivers to Jake Gonzales Blvd. I've already fixed this roundabout, but I'm sure there are many more with the same problem. In a way it makes sense. If the exit and entry nodes are the same, you don't actually enter the roundabout, you just touch it as you pass by. In order to avoid this issue, always use separate entry and exit nodes in roundabouts. Ronny. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJU6pJfAAoJEFH1s49UPGGKRN4QALAf/bM/KW65Ov6Eq+dtIOB9 1pVoaOYFqUe0mhLwPv+I06ySwgtivVkq+RRo5eHXkGWYf9sE8vOE3x+UdHmvnfid d2XaBqIyUdknrAfSphDB0K99nx/dF28wq49F2IUM0gqSGj46FsuHW58gHnZTNhon C1Sk9ushwmUvNCElO5Rxia3NEmQ+uGPVo42EzQ3EHxo3gukjXNZC0JwpMlw7g9aF RsF2VWAa3JiaqA+9nixnsbq0X6ws9Y27RfU9rclvbQLUPDz6yU9mgUuc9SJvYoCU SvPFW5X6tX75efLjkMk6Fcegv1Av9jljVEV03SWgS8zdVhh3F4lz5mPQgCtE9rgP ND49LnYPXxt+D5PQOLxXMcc5Qvun3VIuE3EQA6sfF3qtcCJS0E9ip4j6XyVu/4gx bfiLo2gip3/jeOWm5aF6cCMp7lu6qpsTcdvQqVHp+ns2RyYBkr/n5t2N9wiLARNv vlNFhs5bDz9xFjNiuIqO7+7lNrV3E6mwGadGeFAEM/kYIfSBmMCL2kaS558pCn8M /NzT0gBbLh0ftYjolUn0nCGztuRkK5GKYZ5wbrbEEKRXJoyepl3Cl8BpVIYtbHp/ eSXrnE+skGSk/DPzVyoMgCoutC734c9rxRCXNzzBFdSwGCn1Q5IDoca5kRKZUbzq Z/vQty1vRzrlUKB8LAx/ =59qA -----END PGP SIGNATURE----- _______________________________________________ talk-ph mailing list [email protected] https://lists.openstreetmap.org/listinfo/talk-ph
