First reaction, this is unbelievably great.

Second reaction, this would turn into the chaos and squirrel-rama of Bike NY, 365 days a year.

What happens when there's an accident and a pile-up? How would people get out, how would rescue workers get in?

Of all the cycling photos to choose from, they picked one that's 25 years old -look at the recreational riders in the second photo - helmets (ca 1977 Bell Biker on the right) and toeclips. Nothing like a little visual discontinuity to sell your plan of the future, LOL.