Do you think trikes fit the infrastructure? What about horse and buggy? What about a farm tractor? Where I live these things along with bikes (DF & recumbent) are a common sight on the road. I ride a Velomobile 99% of the time, I think it fits the infrastructure fine along with any of the other modes of transportation I list.

A Velomobile is actually faster and can keep up with traffic better than the other modes of transportation I list. I am curious as to why you think Velomobiles don't fit the available infrastructure if these other modes of transportation are already out there? Just because someone doesn't use what someone else does as a way of transportation, does that mean it shouldn't be on the road? I am speaking of rural & city roads, not interstates.

in my experience of riding a Velomobile most people are excited to see it as their are so few of them around. I think one of the things that keeps people away from them is that they just don't now about them. Then there are the people who can't phathom going anywhere under there own power. A Velomobile is very comfortable hot or cold and keeps you out of the elements.