I know this will fall on deaf ears in Britain, but it's worth saying anyway. Once again we have someone belting along on a bike at over 20 mph, in this cyclists case 24 mph, and he got killed. I've long since lost count of the number of forum members reporting or showing videos about their injuries from riding at those speeds These sporting speeds ridden at by so many cyclists are a comparatively recent phenomenon in Britain, post 1980 and mostly much later.
I grew up in an era when much of the British public cycled as utility cyclists, riding at no more than 12 mph most of the time, often a bit slower and only very rarely at 15 mph. Coming off at those speeds is very unlikely to kill and in any case, braking from those speeds instantly results in greatly reduced speed without risk of going over the bars. It also gives other road users far longer to see you and avoid collisions and yourself more chance of slowing or stopping.
In the trade in the 1950s, I never heard of a single cyclist death or serious injury in my general area, despite 25% of all journeys nationally in the 1950s being by bicycle. And there was no such thing as a cycle helmet then, everyone riding wearing a hat or bare headed. Our customers did crash sometimes, often skids on wet roads, in part due to the hard rubber tyres of that era. But it was mainly their bikes that got the odd scars and they were never badly hurt.
So the choice is obvious, continue to ride at 20 or more mph and sooner or later come unstuck, often through no fault of your own but with possibly very serious consequences. Or take a few minutes longer on journeys and amble along more pleasantly with a lot less effort, not getting hurt.
In a near 70 year span of cycling in Britain, the majority in London and the South-East with the greatest traffic density in the country, I've never worn a helmet and never hurt myself once. But my routine cycling speeds have been 15 mph or less on e-bikes and more like 12 mph on unpowered bikes. The very few times I've indulged in higher speeds has only been in the safest possible known circumstances.
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