I began trying this investigation with a bug report in mapdust reporting a problem with the route calculated between Banbury and Holyhead. It is using 2 lane trunk roads, in preference to the longer motorway / expressway route one would expect.
http://map.project-osrm.org/?hl=en&loc=52.072150,-1.317280&loc=53.307430,-4.630270&z=8¢er=52.546296,-4.191284&alt=0&df=0&re=0 That maybe ok, its certainly scenic and fun, I then found the real problem. Speed limits probably need updating, but that is a summer drive project. In forcing the route expected, it came up with the real issue. Instead of using the motorway around Birmingham, it has used the A34 and gone straight through the city, projecting both an illegal and impossible time estimate. I have selected a small subset: http://map.project-osrm.org/?hl=en&loc=52.455950,-1.868190&loc=52.443520,-1.856910&z=15¢er=52.450360,-1.873298&alt=0&df=1&re=0 The route is exactly 1 mile long. The entire route is tagged as maxspeed=30 mph. The time estimate is 1 minute, meaning OSRM has assumed an average speed of 60 mph. This is really not good, as far as I can tell the mappers have made a first rate job. Any ideas how we improve? _______________________________________________ Routing mailing list Routing@openstreetmap.org http://lists.openstreetmap.org/listinfo/routing
