This is exactly what Boston needs. From the web
Catering to some of the 170,000 cyclists that ride across London every day, this segregated bicycle lane will stretch from west to east, pass through the heart of the city and span 18 miles when completed, the longest of its kind on the continent. Backed by mayor Boris Johnson, a second route will also eventually span perpendicular to this first one, reaching south to north and crossing the first path in the middle of the city.
The thing is, these sort of projects cost money, but they cost DRAMATICALLY less money than say a subway, or highway. These are the sorts of infrastructure projects that make sense on multiple levels, financially, climate wise, health wise, sound wise, beauty wise. These are the sorts of infrastructure projects that benefit a city long term. We should be doing this exact same thing here.
