[Tagging] Carriageway divider

Markus Lindholm markus.lindholm at gmail.com
Mon Aug 20 12:39:14 BST 2012


On 20 August 2012 13:25, Colin Smale <colin.smale at xs4all.nl> wrote:
> Isn't that what turn restrictions are for?

No.

Turn restrictions restrict from which highway object to which highway
object one can traverse, they can't tell whether you're allowed to
make a left or right turn at the start of your route.

/Markus


>
> Colin
>
>
> On 20/08/2012 13:10, Markus Lindholm wrote:
>>
>> On 20 August 2012 12:57, Markus Lindholm <markus.lindholm at gmail.com>
>> wrote:
>>>
>>> On 20 August 2012 09:39, Elena ``of Valhalla'' <elena.valhalla at gmail.com>
>>> wrote:
>>>>
>>>> On 2012-08-19 at 14:09:18 +0200, Markus Lindholm wrote:
>>>>>
>>>>> In my opinion it's best to treat legal separation (i.e. solid_line)
>>>>> the same way as physical separation, i.e. create two separate
>>>>> highways, one in each direction.
>>>>
>>>> This doesn't correspond to reality: I believe that an emergency
>>>> vehicle can cross a solid line, while of course they would
>>>> have problems with a physically separated road.
>>>
>>> I consider legal restrictions to be part of reality. Also consider
>>> that a physical separation might be nothing more than a 20cm high curb
>>> that could be as easy to cross for an emergency vehicle as a painted
>>> line.
>>
>> One other aspect: it would not be possible to create correct routes
>> from an address that's in a middle of a block where the the street has
>> lanes in both direction but that are legally separated. Now if the
>> shortest route would be to turn left (in a country with right hand
>> traffic) but the legal route would require to start the trip by going
>> right, there's no way to express that without having to separate
>> highways, one in each direction.
>>
>> /Markus
>>
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