[mkgmap-dev] Possible maxspeed patchFrom MarkS OSM at redcake.co.uk on Wed Aug 26 20:49:02 BST 2009
Florian Lohoff wrote: > > Wouldnt it make sense to make it possible to apply factors based on road > class to the maxspeed setting? > > e.g unclassified -> maxspeed*0.6 > tertiary -> maxspeed*0.8 > > OTOH this should all be the responsibility of the routing engine > and at the moment as i understand we abuse the maxspeed (OSM) to set > an "average speed" in the Garmin dataset - not something like a > speed limit which is obviously broken anyway and just some > idea to make use of the maxspeed ... > I'd come across this whilst setting up the patch. The main road near me has maxspeed=50mph on it. This then gets converted to kilometers and just scrapes over the 80kph barrier and gets a road class of 5 which effectively assumes you will never drop below the speed limit. My feeling was that there might be a case for another patch which reduces the maxspeed by a certain amount (eg. 5mph or by 20%) when deciding which road class to allocate. This probably needs (yet) another parameter. My patch isn't really concerned with how the maxspeed tag is converted to a road class. It is aimed at deciding whether to use set the road class from the style file, the maxspeed tag (however that is translated to road class) or both.
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