It might not be a popular view, but I'm ambivalent at best towards road cyclists training on public highways. It doesn't seem a great idea to me for public roads to be used essentially as race tracks. Of course there will be accidents (and of course the driver will often be in the wrong, but that knowledge hardly helps the injured party), and it seems to me that all road users should be driving/riding defensively, not pushing themselves as hard and fast as they can go.
The country roads were I live are seen as a mecca for road cyclists -- they held the Olympics there, for a start. That's great, I hope they enjoy themselves. But they seem to lose all road sense when they're in that racing zone. They stop on blind bends, they ride downhill in large pelotons where there will be no room for a vehicle to pass if they come round a corner, and their own brakes are really not up to the job of stopping them dead from 40mph. There are a lot of accidents. I'm not sure what the answer is, but in recent years it has definitely turned from being an occassional irritation to something downright dangerous.