Even if that is valid in its limited domain - and I doubt that it is, given that no consideration seems to have been given to the dangers of increasing variance

Even if that is valid in its limited domain - and I doubt that it is, given that no consideration seems to have been given to the dangers of increasing variance in driver behavior - there's no reason to believe it applies where roads gain a lot more traffic than they are suited for (and especially when most of the increase are technically lost, in that they, personally, do not know where they are or what they will encounter next.)