[Tagging] Center turning lanes: centre_turn_lane=yes method vs. lanes:both_ways method

Tristan Anderson andersontristan at hotmail.com
Sat Feb 18 16:18:25 UTC 2017


I've always used


lanes=5

centre_turn_lane=yes


as a shortcut that implies


lanes=5
lanes:forward=2
lanes:both_ways=1
lanes:backward=2
turn:lanes:both_ways=left

It's just a way to reduce five tags to two in a common, special-case situation.  Lanes can be any odd number greater than one.

________________________________
From: Paul Johnson <baloo at ursamundi.org>
Sent: February 16, 2017 9:20 AM
To: Tag discussion, strategy and related tools
Subject: Re: [Tagging] Center turning lanes: centre_turn_lane=yes method vs. lanes:both_ways method

On Sun, Feb 12, 2017 at 4:43 PM, Albert Pundt <roadsguy99 at gmail.com<mailto:roadsguy99 at gmail.com>> wrote:
To go along with my earlier question about "semi-divided" streets, what is considered the best way to map center turning lanes? I know of the centre_turn_lane=yes key, as well as lanes=3 used together with lanes:both_ways=1 and turn:lanes:both_ways=left, but which of these two is considered better or is simply used more? Additionally, are there any other ways of doing it?

centre_turn_lane=yes seems more straightforward, but the lanes:both_ways method offers a more detailed description of lane layout. I've seen both used in the wild.

Try (assuming drive on right areas):

lanes=3
lanes:forward=1
lanes:both_ways=1
lanes:backward=1
turn:lanes:both_ways=left

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