OpenStreetMap Forum

QingzhaoHan

New Member

Registered: 2020-07-27

Posts: 1

How to depict bilevel roads?

Recently, a new undergroud trunk road opened near my house, which is not currently shown on OSM. It is designed in a way that the eastbound carriageway is directly on top of the westbound one, and both of them are located beneath narrow ground streets. Being new to OSM, I am puzzled about how to show this…
Any suggestions?

kucai

Moderator

Registered: 2011-11-08

Posts: 354

Re: How to depict bilevel roads?

Just offset it to the side, doesn't have to be exactly drawn on top of each other.

BCNorwich

Member

From: Norwich, Norfolk, UK

Registered: 2010-07-31

Posts: 173

Re: How to depict bilevel roads?

Hi, they can be drawn on top of each other as they are in reality, don't join them together at nodes, (except where they might join up at the ends).

Tag them with the appropriate layer, the highway at ground level would be layer=0 so the layer is implied, it need not be tagged. Tag layer=-1 to the higher of the underground highways and tag layer=-2 to the lower one.

Kovoschiz

Member

Registered: 2019-10-06

Posts: 128

Re: How to depict bilevel roads?

JOSM is easier than iD here, when there's no snapping by default, and better object selecting.

Last edited by Kovoschiz (2021-06-24 09:23:09)

whturner

Member

From: Landgraaf NL

Registered: 2016-02-28

Posts: 125

Re: How to depict bilevel roads?

See also the situation in Maastricht (The Netherlands) where also two tunnel are below grounflevel:
https://www.openstreetmap.org/query?lat … 407/5.7150