Following on from the discussion tonight about possible continuity
errors on A27 on OpenStreetMap - I've just checked it using Navit. I've
set the position on Eastbourne/Polegate and destination at the other end
in Portsmouth - where the M275 starts. Navit seems to be happy to route
on A27 all the way - without any deviation. The map I have in Navit has
just been downloaded last week - so maybe somebody has rectified A27 in
the meanwhile.
Another explanation might be connected with the routing engine used by
the navigation software. For a while Navit use to do the same for me -
suggest that I come off a main road or A road and follow some strange
shortcut through 20mph roads in the middle of some housing estate - in
order to save 0.3 miles of the total route. I've adjusted the weights on
the various type of roads in the Navit config - so that it favours a bit
more faster roads when choosing a route - and it seems to suggest saner
routes. However, on occasion I still have trouble convincing it to stick
with motorways - and it will suggest entire sections of 30-40 miles
through A roads which I happen to know that are full of traffic lights
every few hundred yards - just because it is convinced it will save few
miles by going that way.
Depending on what navigation software is used - similar symptoms might
explain strange detours off the main road.
Sebastian
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