On Wed, Jun 22, 2011 at 3:06 PM, Robert Naylor <rob...@pobice.co.uk> wrote:
> I'm the original author. I was going to bring it up in tagging but I got > behind in mapping collected data, and have been working more recently. > Ah, good to meet you Pobice, nice to know you're still around. I originally started with functional values, but as a compromise to a few > people suggesting that we should use just a measurement I added a approx > height range for each value. > > I think we need to re-add a kerb=normal in to replace the original > kerb=yes. It possibly could be useful to mark if a traffic island is raised > or not, or if a kerb separates say a cycle lane from a road. It ranges is > possible anything above 0.03m to 0.16 > > Also raised needs to be changed back to ~>0.16m as it was intend to > indicate raised kerbs for bus stops etc. > Keep in mind that we need to accommodate an international audience. I'm only speaking from a US (or even east coast) perspective, but the kerbs I'm familiar with include: * By far the most common are ones which run along the majority of streets, typically 15-20cm (6-8in) in height. At older crossings (before accessibility requirements entered law), it is common to see this type of kerb. I've been tagging these as kerb=raised. * At more recent crossings sloped curbs (also called curb cuts) are common, which slope gradually from the sidewalk to the street. I've been tagging these as kerb=lowered. * At islands/medians, it is common for there to be no raised portion at all, but rather the median/island is cut out. I've been tagging these as kerb=flush. I say all this because kerb=normal to me means those kerbs that are 15-20cm, and so in my eyes it's hard to see the distinction between this and kerb=raised. If kerb=raised means something special to those in the UK or Europe, perhaps we should avoid using that term. Here's a possible set of values that *might* satisfy at least US and European needs: yes = as it is now, some sort of kerb exists, but hasn't been identified particularly yet flush = as it is now, no height change at all (cut through a median/island), suitable for foot/bicycle/wheelchair/etc lowered = as it is now, gradual change suitable for wheelchairs (as well as foot/bicycle) rolled = as it is now, enough of a height change to be unsuitable for wheelchair access, but suitable for foot/bicycle normal = unsuitable for wheelchair, difficult for bicycle/mobility impaired, anything above 3cm bus = specifically at a height intended for use with buses (whatever height is appropriate in a given country) This way we avoid the ambiguous kerb=raised, but satisfy the needs of some to map kerbs intended for buses. -Josh
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