In new neighborhood, those home owners favoring little to no parking for vehicles could all populate both sides of the road way, along with businesses catering to non-vehiclular traffic.

Forget the barricades. Install cameras and motion sensors.

Make speeds within the block very slow and photograph cars that speed.

Make it illegal to drive from one “bike freeway” block to the next, require a left or right turn at the end of the block. Photograph offenders.

Use motion sensors to warn bike riders of cars approaching from a side street at a speed which makes it likely they will drive into the bike freeway without stopping. Photograph offenders.

A few cheap radar chips, a few flashing LEDs, a bit of computing power. Shouldn’t cost a lot of money.

Traffic fines would probably more than pay for the system. Some knuckleheads would violate the ‘only one block’ rule or run a stop sign. And bike riders would be alerted to knucklehead in zone.

Pick a residential street. I would think the residents would love it. More parking spaces. Less traffic noise. No one speeding on their street.

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One of our towns has a speed controlled stop sign that looks like a normal stop sign until you approach it a bit fast. Then a number of red LEDs around the edge of the sign start blinking.

Use automatically retracting barricades so that people living on each block can park but traffic can’t flow through. By using angled ‘nose in’ parking the number of parking spots could be increased and still leave plenty of bike space.

Even put in a low curb to keep cars from backing into the bike space.

Make all cross streets into stop streets for vehicles.