Brimstone wrote:

Nor was anything said about other vehicles crashing. Care to try once more?

anyone more of this nonsense and you'll be marked as a troll if you're
not already

Your point was this:

How does travelling at a slow speed cause someone to crash?

and I've answered that. Does the "someone" have to be the same person
that was travelling at the slow speed? I've answered that too in point
2 (saying they will be on the road longer and are therefore likely to
lose concentration).

So you drive slowly, your journey takes 3 hours instead of 2, after 3
hours your concentration has lapsed, you don't pay full attention,
crash.