Not anti-cyclist but
For many years I was lucky enough to live two miles from my office with the ability to cycle from home to work completely via cycle tracks, no need to go on roads at all. Absolutely brilliant. I don't live there any more however so I was forced to decide "no more bike to work."
I realise we have just as much right as car drivers to be on the roads but from a practical point of view it is just too dange. You wouldn't walk along the yellow lines with a truck whizzing next to you, is a bike that much different?
For the avoidance of doubt - my point is not that "cyclists should be off the roads" it is that I personally enjoy living too much to share a road with the lorries.