[Tagging] Turn Restriction usage

[Ross Scanlon]

>> No.  The router should know not to do this. Likewise as below the router
>> should not make u turns at traffic lights.
>
> Based on what? How does the router know that the two ways are two
> carriageways of a single road? Couldn't they be a straight road, that
> becomes a oneway street at a certain point, and at that point a
> junction brings to a oneway secondary road?

The name of the way, the fact that you are turning > 180 degrees on the 
same way.

Cheers
Ross