[Routing] Routers ignoring speed limits

[Philip Barnes]

Thanks Dennis
I only tried OSRM in this case, although the original problem of using the A5, rather than A55 was from skobler. I think that one needs some survey work.

One thing that was concerning me was the use of maxspeed=signals on the M42. I would have assumed the speed limit should be 70 mph, with a note or some other tag regarding active traffic management?

Thanks Phil
 
--
 
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On 04/01/2013 11:39 Dennis Luxen wrote:

Hi,


the bug was found and fixed in develop branch.

https://github.com/DennisOSRM/Project-OSRM/commit/7c54d4e62fc84b29915dc618fd3dba2962752e92


It will be visible on the routing site in the coming 24 hours. Did the 
bug only affect OSRM or was it visible somewhere else, too?


Best regards,
Dennis



On 04.01.2013 00:48, Philip Barnes wrote:
> 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.
>
> https://github.com/DennisOSRM/Project-OSRM/commit/7c54d4e62fc84b29915dc618fd3dba2962752e92
>
> 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:
> https://github.com/DennisOSRM/Project-OSRM/commit/7c54d4e62fc84b29915dc618fd3dba2962752e92
> 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?
>
>
>
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> https://github.com/DennisOSRM/Project-OSRM/commit/7c54d4e62fc84b29915dc618fd3dba2962752e92
>

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