[OSM-talk] Google Maps v.s. OSM routing in Berlin

[Dan Karran]

2009/9/17 Ævar Arnfjörð Bjarmason <avarab at gmail.com>:
> Why doesn't OSM ever tell me to take a 270 degree turn into oncoming
> traffic on a 6-lane highway and get onto the motorway_link on the
> other side?

It's actually quite disturbing to think that GPS units are going to be
using the same data and presumably giving similar directions in-car.

> http://maps.google.com/maps?f=d&source=s_d&saddr=B2%2FB5%2FHeerstra%C3%9Fe&daddr=A115&geocode=FQQ6IQMdPXrKAA%3BFX38IAMdsmvKAA&hl=en&mra=ls&sll=52.493736,13.266249&sspn=0.002567,0.009645&ie=UTF8&t=h&ll=52.502622,13.277648&spn=0.001283,0.004823&z=18
>
> http://cloudmade.com/maps?lat=52.505434&lng=13.272686&zoom=15&directions=52.50880994711401,13.266667127609253,52.49494458610386,13.267847299575806&travel=car&styleId=1

I was looking last night at a route on the Isle of Man and found some
inconsistencies around following the same road,

e.g. 'take first right' when really there's a road off to the left and
the road you're on just continues as normal

http://maps.google.co.uk/maps?f=d&source=s_d&saddr=Cregneash,+Castletown,+UK&daddr=Ramsey,+Lezayre,+United+Kingdom&hl=en&geocode=%3BFRXkPAMdehC9_w&mra=pe&mrcr=0&sll=52.936326,-2.040032&sspn=7.47315,19.160156&ie=UTF8&ll=54.203247,-4.628962&spn=0.00177,0.004678&t=h&z=18

and 'turn right' to stay on the same road, even though it just
continues past the junction with a curve to the right.

I guess I should check out OSM's routing on similar routes to make
sure it doesn't have similarly confusing pitfalls :)


Dan

-- 
Dan Karran
dan at karran.net
www.dankarran.com