[OSM-talk] Zonal restrictions.

[Shaun McDonald]

On 14 May 2009, at 11:55, Ben Laenen wrote:

> On Thursday 14 May 2009, MP wrote:
> [..]
> And these situations are more common than you may think. Built-up  
> areas
> are the most common where such a thing happens here as they're of
> course the largest kind of zonal restrictions, and each city will have
> it's roads crossing them without being part of it. But I've also seen
> it with zones with parking restrictions or zones with speed
> restrictions.
>
> And you just can't tag the road with for example an overruling  
> maxspeed
> tag, as the road may just have its default maxspeed in which case you
> don't tag that speed.
>

Yeah but the default maxspeed becomes the one of the zone. So the road  
would then need a specific restriction, or the zone would need to be  
split. The following evaluation hierarchy could be used:
1. Use the default restrictions for that type of road.
2. Is a road in a restriction zone? Use those restrictions instead of  
in 1.
3. Does the road have a specific restriction on it? USe that instead  
of 1. and/or 2.

Shaun

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