[Routing] Question about OSRM Travel delay computing

[Richard Saba]

Hi Daniel,

Do You know if there is any other criteria’s taken into account but located into data and not into profiles ?
For example, isn’t considering maxspeed =90 kmph for all motorways, an error since in reality motorways may have different maxspeed.
So I wonder if in the OSM data, roads have also attributes indicating their maxspeed and this speed is also taken into account when computing travel duration.

Is there any need to look in the routing engine to see how it works or it’s for sure only settings from profiles are to be adapted in order to make duration computing more realistic ?

Hope I was clear ☺

Best Regards,
Richard

De : Daniel Hofmann [mailto:hofmann at mapbox.com]
Envoyé : mardi 29 août 2017 12:49
À : routing at openstreetmap.org
Objet : Re: [Routing] Question about OSRM Travel delay computing

OSRM derives speeds and durations from OpenStreetMap tags such as `highway=`, `maxspeed=`, traffic signals, road width, number of lanes, etc.

You can check the profiles for details:

https://github.com/Project-OSRM/osrm-backend/tree/master/profiles

Here's the demo server's debug map showing derived speeds:

http://map.project-osrm.org/debug/#13/37.7960/-122.4536

You will need historic or real-time traffic data for accurate ETAs especially in congested areas such as cities; OSRM has a traffic feature for that:

https://github.com/Project-OSRM/osrm-backend/wiki

Some hosted services provide real-time and historic traffic integration such as Mapbox (disclaimer: I'm with Mapbox):

https://www.mapbox.com/api-documentation/#directions

HTH,
Daniel J H



On Tue, Aug 29, 2017 at 6:13 AM, Richard Saba <rsaba at galigeo.com<mailto:rsaba at galigeo.com>> wrote:
Hi,

I have a problem regarding travel delay computed by OSRM. In some situations like in big cities, this delay is not realistic.
For example in Paris, it’s 1 mn per 1km. Google maps estimates it at 5mn.

Therefore, I would like to get answers to the following questions :


1-      What are the criterias (and steps if possible) used by OSRM 5.3.0 while computing travel delay.

2-      What are the possibilities provided to enhance the results and make them precise.

Best Regards,

RSA7


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