Anecdotally, in Vancouver we have narrow lanes in the city, with many streets having all kinds of bike lanes along their sides – both shared and separated. It w

Anecdotally, in Vancouver we have narrow lanes in the city, with many streets having all kinds of bike lanes along their sides – both shared and separated. It works quite well, especially the separated ones. Narrow lanes surely do decrease average driving speed, it's damn uncomfortable to drive fast in traffic, and staying in the lane requires more concentration. I do miss wide Russian lanes sometimes, but the narrow ones are undeniably safer.