[Talk-us] stop signs

Paul Johnson baloo at ursamundi.org
Wed Oct 27 19:51:06 BST 2010


On 10/26/2010 09:17 AM, Nathan Edgars II wrote:
> On Tue, Oct 26, 2010 at 8:36 AM, Adam Schreiber <sadam-PwfglQ4RZxKVc3sceRu5cw at public.gmane.org> wrote:
>> I think that 4-way and 3-way stops can be handled unambiguously by
>> highway=stop.  More complex stops should probably be modeled with turn
>> restrictions.
>>
>> type=restriction
>> restriction=stop
>> roles=from,to,via
> 
> But a stop sign isn't a restriction; it has the main effect of slowing
> average speed. If our router is so precise that the seconds added by a
> stop sign count, it can easily calculate the nearest intersection to
> each stop sign node to figure out the likely direction. But for
> practical purposes simply halving the number of stop sign nodes passed
> should be enough.
> 
> What's wrong with something like highway:forward=stop or
> highway:backward=stop for the node where one must stop?

If the stop sign's location next to the road is explicitly tagged, about
the only feasible way to define it's direction is with a relation.


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