Update bicycle weighting profile?

[mpadge]

The [brouter algorithm] includes some really detailed profiles, and generates very good routing. One quick check for routing in Muenster along the promenade was perfect; .

In comparison, graphhopper is okay:

but initially goes along a road rather then promenade, whereas both OSRM and Valhalla are rubbish, and just route along car roads instead of the Promenade. Current dodgr algorithm for bikes still gives way too much weighting to car-laden roads. The cost factors are far more variable and sensitive to different types of ways than current dodgr equivalents. Plus another issue with this package is that the actual weighting profiles are all contained in a binary and not a text file, so are not directly accessible outside this package. That should also be changed.

[mpadge]

brouter actually only generates that impressive-looking route because it has a default to absoultely follow long-distance cycling routes where they exist. That alone makes it very european-centric, and such performance is not likely to be generally repeatible in other locations. Removing that bit of the code reverts to actually worse-looking routes than current dodgr, so profile will be left as, is for the moment at least.

[mpadge]

For reference, these were the modifications I made to weighting profiles to compare:

Current bicycle profile

mode	highway type	weighting	speed
bicycle	motorway	0.00	NA
bicycle	trunk	0.30	NA
bicycle	primary	0.70	15
bicycle	secondary	0.80	15
bicycle	tertiary	0.90	15
bicycle	unclassified	0.90	15
bicycle	residential	0.90	15
bicycle	service	0.90	15
bicycle	track	0.90	12
bicycle	cycleway	1.00	15
bicycle	path	0.90	12
bicycle	steps	0.50	4
bicycle	ferry	0.20	15
bicycle	living_street	0.95	15
bicycle	bridleway	0.70	8
bicycle	footway	0.90	4
bicycle	pedestrian	0.80	4
bicycle	motorway_link	0.00	NA
bicycle	trunk_link	0.30	NA
bicycle	primary_link	0.70	15
bicycle	secondary_link	0.80	15
bicycle	tertiary_link	0.90	15

Equivalent brouter profile

These are roughly the equivalent values from Profiles from https://github.com/abrensch/brouter/blob/master/misc/profiles2/trekking.brf#L175:

mode	highway type	weighting	speed
bicycle	motorway	10000	NA
bicycle	trunk	10.00	NA
bicycle	primary	3.00	15
bicycle	secondary	1.60	15
bicycle	tertiary	1.40	15
bicycle	unclassified	1.30	15
bicycle	residential	1.10	15
bicycle	service	1.30	15
bicycle	track	1.30	12
bicycle	cycleway	1.00	15
bicycle	path	1.30	12
bicycle	steps	40.00	4
bicycle	ferry	10000	15
bicycle	living_street	1.10	15
bicycle	bridleway	5.00	8
bicycle	footway	1.30	4
bicycle	pedestrian	3.00	4
bicycle	motorway_link	10000	NA
bicycle	trunk_link	10.00	NA
bicycle	primary_link	3.00	15
bicycle	secondary_link	1.60	15
bicycle	tertiary_link	1.40	15