[Tagging] Cycle boxes for two-stage left turns

Morten Lange morten7an at yahoo.com
Wed Jan 8 00:40:58 UTC 2020


 Hi,

On-street markings for a two-stage left-turn were recently introduced on a few roads/streets in Oslo, Norway. 

I think 
cycleway:asl=two_stage_left_turn
looks okay.

But since there is 
cycleway=asl

why not use
cycleway=two_stage_left_turn


Sadly taking a two-stage left turn is obligatory in some countries. 
Are there any known examples where they are not obligatory but exceptions are marked with trafficsigns? (Or the opposite)



-- 
Regards / Kveðja / Hilsen Morten Lange


     On Wednesday, 8 January 2020, 00:52:14 CET, Jarek Piórkowski <jarek at piorkowski.ca> wrote:  
 
 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
node?

"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"."

Thanks,
--Jarek

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