If you've ever seen a mangled barrier by the side of a road, you'll understand why encouraging humans into the road as a traffic calming strategy is rather problematic.
Enlightened cities such as those in the Netherlands tend to take a risk-elimination approach - residential streets will be designed to keep speeds low, and neighbourhoods designed so that through-traffic doesn't try to take shortcuts along them. This makes it safe for cyclists to use the roads without special infrastructure. Only busier main roads have infrastructure. This is hard to imagine in the US where many cities in the US seem unfamiliar with the concept of any road not being a busy main road!