On Thu, Aug 26, 2010 at 8:24 PM, John Smith <deltafoxtrot...@gmail.com> wrote: > On 27 August 2010 10:04, Nathan Edgars II <nerou...@gmail.com> wrote: >> >> The way I understand it, a culvert is just a tiny pseudo-bridge, physically >> equivalent to a tunnel under an embankment. Culverts don't show up in the US >> National Bridge Inventory, which is a database of bridges on public roads. >> They normally carry water under roads, but may also carry a private farm >> access road under a highway that splits a farmer's land. > > There was discussion about this sort of thing on the Australian list > some time back, although from memory it was more about what > constitutes a bridge, I can't fully remember the outcome, but imho > anything able to allow something as big as farm machinery or a person > to go under a road would be a tunnel not a culvert.
So tunnel=culvert :) Here's an example of what I'd call a farm access culvert: http://maps.google.com/maps?t=k&layer=c&cbll=28.203143,-81.694469&panoid=m0xmwF1Hx8Ct09dXPzcRRQ&cbp=12,193.6,,0,2.84&ll=28.203453,-81.694529&spn=0.003981,0.0103&z=18 The line between bridges and tunnels is not always clear, so you're not going to have well-defined bounds for what a culvert is. _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
