It happens. Marshals can only cover so many junctions and drivers can appear out of private drives / elsewhere / just ignore marshals.
We had speeding motorbikes getting into the race convoy at the weekend despite the best efforts of the vehicles at the rear. Fortunately there were no collisions but it was a bit too close for comfort.
The women’s peloton had problems a couple of years ago with cars on the course and cancelled the race in Portugal. The organisers said they should just get on with it.
Yes, I remember Chris Boardman reminding some interviewer that there isn't any practical helmet possible that can absorb the impact energy of a motor vehicle.https://www.bbc.co.uk/sport/cycling/articles/czxqqlpnx98o
The poor lad gets hit by a vehicle during a pro race and the issue is inadequate helmets??
https://www.bbc.co.uk/sport/cycling/articles/czxqqlpnx98o
The poor lad gets hit by a vehicle during a pro race and the issue is inadequate helmets??