Test for turning restrictions with duplicated to/from

[osm-fr]

Test for turning restrictions with duplicated to/from

[frodrigo]

No test for this. It's make sense except for U-Turns.
Can be done in sax plugin

[naoliv]

But the problem that I see a lot here is exactly for u-turn.
Some users add a lot of no_u_turn restriction with the from and to as the same way.

no_u_turn should be considered an implicit value when we refer to the way itself.

[frodrigo]

I see no exception in the wiki about u-turn. So, I think it must be like other, even when from is to.

[naoliv]

But if this is allowed, people could start adding two no_u_turn on every highway segment (one on each ending).
Maybe it's not forbidden, but also doesn't make sense to have such turn restrictions.

[frodrigo]

Maybe it's not the same rules in Brazil and here in France. But unless there a non u-turn sign you have the right to do it. So here it's not useless to map no-u-turn.

[naoliv]

Can this test be enabled only for Brazil then?

[naoliv]

Or disable only in Frace?

Maybe I am not properly explaining this :-)
I asked right now in #osm:

"Is no_u_turn implict on the way itself? (ie, it isn't necessary to add a no_u_turn on every highway segment with both "from" and "to" as itself)"

And got an answer:
"correct, it's only necessary to add it when the way is split into two parallel ones"

[frodrigo]

commit 316752d3be6bae6c3e661ff3b289a8a2d80986c8 (HEAD, master)
Add plugin Structural_Restriction for no u-turn on Brazil

[frodrigo]

It's online. Please, can you check ?
http://osmose.openstreetmap.fr/map/#item=3180&class=31801

[naoliv]

Very good!
Is it testing only no_u_turn?
This test could be extended for every kind of restriction (no_left_turn, no_straight_on, only_right_turn and everything else doesn't make sense (at least here) when to and from are the same way)

[frodrigo]

Generalise Structural_Restriction plugin to all restriction types github#20
c216d9f

[frodrigo]

Done. Almost no error in other counties.