[GraphHopper] Source of higway and surface speed for bicycles

[ratrun]

Hi Dominic,

When you anyalyse the speed guesses in the graphhopper encoders you 
should not look at any absolute values. These cannot be estimated 
without knowing the physical strength and bike equipment of the 
individual rider. It would be more interesting to look at the relation 
of these values, e.g taking the 18 km/h value for highway=residential as 
100%. It would be nice if you could provide some data and/or literature 
in your thesis for this specific isolated issue, maybe also describing 
what influence it has if cyclists and pedestrians need to share a way 
and the width of the way ...

I think you need to forget the GPS tracks from osm for your purpose. 
These are not even classified which kind of vehicle was used for 
creating them. You might look at gpsies [1] using the "Extended search". 
Under "More attributes" you need so select "GPS" recorded. Maybe you 
find some useful data for your purpse there.

When you analyse the impacts of the infrastructure on cycle speed and 
the features of routers, then one important missing graphhoper feature 
is issue #75 (interpretation of traffic lights). Here it would be nice 
to find information about average wait times for cyclists. Maybe you can 
reference to literature for the wait times for cyclists and cars, the 
average speeds and the influnce of the distances between the lights.

regards,

ratrun

[1] www.gpsies.com/trackList.do

Am 30.04.2015 um 11:23 schrieb Dominic Keller:
> Thank you for your information, Peter.
>
> If I get some nice results, I will inform you!
>
> I dont know anything about useful gps-tracks available online, so I am 
> collecting data myself. The gps-tracks on planet GPX do not have 
> timestamps and no information about travelling mode, do they?
>
> Kind regards,
> Dominic
>
> 2015-04-30 11:14 GMT+02:00 Peter <graphhopper at gmx.de 
> <mailto:graphhopper at gmx.de>>:
>
>     Hi Dominik,
>
>     yes, just guesses from developers on the road and no literature
>     used. Would love to see some more solid ground for this e.g. using
>     OSM planet GPX
>
>     Keep in mind that these speeds are not max speeds but average
>     speeds. The maxspeed tag is handled differently in applyMaxSpeed.
>
>     Kind Regards,
>     Peter
>
>
>     On 30.04.2015 11:06, Dominic Keller wrote:
>>     Hi all,
>>
>>     I am writing my master thesis about the influence of the
>>     infrastructure on bicycle speed. Beside doing on-road experiments
>>     I would like to give an overview, how routing algorithm calculate
>>     the speed of bicyclist.
>>
>>     I have seen, that graphhopper uses a list of maxspeed parameter
>>     in BikeCommonFlagEncoder.java
>>     <https://github.com/graphhopper/graphhopper/blob/master/core/src/main/java/com/graphhopper/routing/util/BikeCommonFlagEncoder.java>,
>>     like
>>
>>         setSurfaceSpeed("gravel", 12);
>>         setHighwaySpeed("service", 14);
>>
>>     How did you defined these values? Are they just guesses? How did
>>     you guessed them? Or could you find them somewhere in literature?
>>
>>     Thank you for your information!
>>     Regards, Dominic
>>
>>
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