[Tagging] Cycle boxes for two-stage left turns

Jarek Piórkowski jarek at piorkowski.ca
Tue Jan 7 23:50:02 UTC 2020

On Tue, 7 Jan 2020 at 16:29, marc marc <marc_marc_irc at hotmail.com> wrote:
> Le 06.01.20 à 04:19, Jarek Piórkowski a écrit :
> > Comments most welcome!
> keep it simple !
> advanced stop box only use a cycleway=asl without relation
> https://wiki.openstreetmap.org/wiki/Tag:cycleway%3Dasl
> a single node is not enought ?

Hi Marc,

I wrote the following about cycleway=asl in the original message, do
you have any further thoughts on these objections against using ASL

"To my understanding, this is not the same as a cycleway=asl (advanced
stop line, "bike box") in OSM as an ASL is _behind_ the stop line and
behind the pedestrian crossing, and thus not really easily usable for
left turns [from the way not tagged with ASL] - cyclists would have to
cross the stream of pedestrians to get into the box.
Looking for an alternatives to a relation, I came up with
https://bin.piorkowski.ca/2019/possible_asl_node_tagging.png and
described it as following: "I suppose something like this could work
to avoid a relation, routers would then have to look for
cycleway:asl=two_stage_left_turn a little to the right of where they'd
 like to make a left turn.
Disadvantages: the portrayed distance to turn off to right is further
than the actual distance; routers might well find it easier to find
left turns as they would normally and then prioritize those with a
bicycle_two_stage_left_turn relation
frankly I don't really like that solution much, and the other editor
contributing in the Slack thread thought it would be "misleading,
since the box is on a way not actually involved in the turn"."


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