[andor]

I don't think this is very useful for cycling in cities anyways. It's perfect for road cyclists, though.

* In cities, I always expect cars to be behind me, and cars expect cyclists

* There is more protection from wind in cities, so the chance that I can hear those cars is higher. Outside the city it's more dangerous. When going downhill at more than 50 km/h, or on a flat stretch with side winds, the chance that I can hear cars behind me is close to zero.

* The speed limit in cities is lower

[mthoms]

>There is more protection from wind in cities

The opposite can also be true.

http://en.wikipedia.org/wiki/Street_canyon#Effect_on_wind