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 B
ikeCommonFlagEncoder.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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