Is there a speed at which I feel uncomfortable riding?

I'm not overly thrilled at anything over about 50-55 km/h. But fortunately I only hit those speeds going down decent hills.


Is there a speed at which motor vehicles travel around which I feel uncomfortable riding?

No.

My favourite roads are quiet country roads with a posted speed limit of about 60-80 km/h.

My second favourte roads are multilane highways with wide shoulders and a posted speed limit in excess of 100 km/h.