[talk-au] Secondary roads are of primary importance.

Nick Hocking nick.hocking at gmail.com
Wed Aug 31 07:43:39 UTC 2016


Secondary roads often have high speed limits and are connected to low speed
residential roads. This can cause issues with cars slowing in front of fast
moving cars and cars crossing in front of traffic.

For this reason there are many intersections on secondary roads that have
no-u-turn or no-right-turn restrictions. Often the restrictions are time
limited depending on whether you are travelling to the city, in the
morning. or back from it in the evening.

A lot of these restrictions are not yet mapped in OSM and will cause
irritating and incorrect (and often dangerous) route advise for visitors to
an area. I believe that checking all seconday roads in the larger cities
(and wherever visitors may travel) would be really usefull in making OSM
better.

First, use an online router to rout from one end of the secondary road to
the other. Any "squiggles" where the router takes you off the road and then
straight back on it, will almost certainly be due to missing maxspeed tags,
where the router is using a higer default speed for the segment that has no
maxspeed tag.  These are easily fixed by survey.  Then do the same for the
reverse route.

Next a really usefull tool is a dash cam with embedded lat/long and audio
(E.G Garmin nuvicam or dezlcam).

Drive the route and voice annotate all turn restrictions as you see them
(sometimes the dashcam resolution is a bit poor at speed and the signs may
not be easy to read).   Then use JOSM, with LPI base maps and LPI imagery,
along with your own dashcam imagery/audio to improve OSM for that road.
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