On Sunday 02 August 2009 11:57:12 John Smith wrote: > --- On Sun, 2/8/09, Blaž Lorger <blaz.lor...@triera.net> wrote: > > Unfortunately lanes only specifies number of lanes. In > > general every road that > > is not one way has at least 2 lanes, even if it is narrow, > > say 3.5 meters. > > Even one way roads can have multiple lanes. Like dual carriage ways :) > > > Some good practices > > on how to accurately estimate road width could also came > > handy. > > I feel you could get road widths accurately enough based simply on the > number of lanes and the type of highway. > > For example, a residential road with 2 lanes, one in each direction is > usually about 6-7m wide. > > Motorways are usually the numbers of lanes times 3m + 3m each side of the > road way to allow for break downs, or maybe you could even have lanes=* > breakdown_lanes=* to make this more accurate, but in any case a 3 lane > motorway will be about 15m wide (3 * 3 + 3 + 3).
Main point here is to identify narrow roads. This is where road width matters the most. It is obvious that narrow roads will have 2 lanes. Unfortunately, those lanes will be narrow (2m or less). So number of lanes will in no way indicate road width, especially for narrow roads. _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk