London Assembly and Mayoral elections 2020, postponed until 2021

My sums probably went wrong somewhere

I suspect they're more accurate than the ones that came up with two million miles. I just googled that there's estimated to be 246,700 miles of maintained roads in the whole UK. Two millions miles seems like an unnecessarily wild exaggeration.

I can't imagine how many exits there would have to be to make that total length worthwhile? Surely like one per half mile or something? Or the massive infrastructure needed to ventilate them all when they were at their operating peak.