Narrow travel lanes are safer & move more cars

[Mark Abraham]

Here's an example of a problem that's easy to make significant headway
on, in part through a little bit of paint & more bike lanes.

"The conventional engineering wisdom that favors 12-foot traffic lanes
to 10-foot lanes is deadly wrong—especially for city streets.

1. Narrow lanes are safer

2. Cars in wider lanes tend to go faster

3. Traffic capacity in Toronto was actually highest for lanes right
around 10-feet wide."

http://www.citylab.com/cityfixer/2015/07/10-foot-traffic-lanes-are-saferand-still-move-plenty-of-cars/399761/