[maelito]

Ranking Bordeaux and Nantes next to Amsterdam is nonsense.

Amsterdam is miles ahead in terms of infrastructure. This ranking dilutes the most important thing to get these results : good bike lancés everywhere with no discontinuity.

Disclaimer : I've built villes.plus, an open source automated evaluation of bike lanes. 100 points, compute itineraries in "secure" mode with Brouter between these points, count the % of secured km -> score.

Amsterdam tops at 8/10. Bordeaux is at 3/10, Nantes 2/10.

https://villes.plus/cyclables/Amsterdam?id=271110

https://villes.plus/cyclables/Nantes.8

[prmoustache]

I can't speak about Nantes which I haven't visited for decades but I think it is wrong to count bikes lanes as a single parameter.

Dutch urbanists have found that bike lanes are very important when streets used by cars are unaltered. Once you implement a lot of traffic calming features and cars never reach 30kph comfortably, bike lanes aren't that important and then streets can be shared across all users.

[maelito]

> it is wrong to count bikes lanes as a single parameter.

Of course it is. See % of safe km as a minimal condition, not as perfection.

Note that bike lane ! = safe km. You're right. There are bad bike lanes and good peaceful streets. See other comment for algorithm.

20 km/h streets are counted.

[noobcoder]

Fun fact Amsterdam recovers roughly 15000 cycles per year from their canal. IIRC they have a board with the number for each year

[DonHopkins]

>Amsterdam is miles ahead in terms of infrastructure.

Amsterdammers prefer to think of themselves as kilometers ahead. ;)

[throwaway198846]

What does it mean to be "secure"?

[maelito]

https://github.com/laem/villes.plus/blob/master/isSafePath.j...

Feel free to suggest a better algorithm ! It's version 2, issues already discuss missing important OSM tags.