Can’t speak to the switching to triathlon part of the question, but I’ve been road racing a lot of years, staring back in the days when six cog freewheels were state of the art. There always have been risks associated with bike racing, especially in the lower rider categories, where strength on the bike doesn’t necessarily mean strength in terms of skills and pack awareness.
These days, there are less opportunities to road race in IRL. The growth of indoor platforms like Zwift has produced a cohort of riders who are very strong, but who might not have the necessary skills to manage a pack on the road. Also, the culture of racing has changed pretty significantly over the years, with even the upper categories becoming way more aggressive in the pack, and far earlier in a race. It seems that almost every moment in a race has become high stakes.
For instance, it used to be that non-sprinters would drift to the back near the end of a flat stage to let the sprinters compete it out. There was a greater culture of respect for the stronger riders in the peloton, and people raced a whole lot more, which meant that the stakes for most individual races weren’t as high.
While I have no stats, it’s my sense that road racing is more dangerous than in the past (but then, I might just be an old guy yelling at clouds, too) and that a greater number of stronger riders in the peloton have weaker pack skills than in the past, due to the rise of indoor training.
This said, my most catastrophic accidents, the ones that resulted in joint replacements and long rehab stays, took place in triathlons, when I was doing the bike leg. Racing Cat 1 and 2, I wasn’t as worried about crashing as I was in the lower categories or when I do a relay in a big triathlon. And this comes from the perspective of someone who was a sprinter, when we all kinda expected to go down at the end of a race.
Of course, though, the real reason for the increased danger in road racing is the move to disc brakes. They are WAY more dangerous that then old Spinacci aerobars and Spinergy carbon wheels. (/pink)
On the other hand, I got my start racing on the track and when I moved to crits, I was horrified at how much people used brakes to control their positions in a pack. That took some adjustment 