If you click on a section of the generated route a dialog box will appear allowing you to rate that section's perceived safety on a scale of 1-7, this will affect future generated routes. Also the system tends to prefer residential streets and cycleways over major roads, and prefers roads with bike lanes or signed bicycle routes.
OpenStreetMap
Discussion
Cummentu dae wieland de su 22 martzu 2010 a is 08:58
How do they know, which way is safer?
Cummentu dae andrewpmk de su 23 martzu 2010 a is 03:51
If you click on a section of the generated route a dialog box will appear allowing you to rate that section's perceived safety on a scale of 1-7, this will affect future generated routes. Also the system tends to prefer residential streets and cycleways over major roads, and prefers roads with bike lanes or signed bicycle routes.
Cummentu dae wieland de su 23 martzu 2010 a is 21:06
@andrew: Thanks