Proposal:U-turn

Proposal

I propose to use u_turn=* to indicate whether u-turning is allowed directly on a two-way highway.

Rationale

I can find no documentation on about u-turning directly on a way, not at a node. The ability to u-turn is useful for routing to circumvent turn restrictions (for example, if you want to turn right at a junction which doesn't allow you to turn right, you can turn left onto a two-way road, then immediately make a u-turn and go straight if the road legally allows you to do so).

Tagging

Use u_turn=* and the values according to access=* to indicate if U-turning is allowed. Use a sub-key for individual vehicle types.

• u_turn=no - U-turning is legally not allowed on the highway
• u_turn=yes - U-turning is legally allowed on the highway
• u_turn:motorcycle=yes - U-turning is legally allowed for motorcycles - used to override a general u_turn=no
• u_turn=customers - U-turning is only allowed for customers

Applies to

• highway=*

Rendering

None, for routing purpose only. The ability to u-turn can avoid going a long detour, especially for smaller vehicles.

Comments

Please comment on the discussion page.