Re: Cars, vans, lorries are the problem
"Capacity of the streets would be adequate. Journey times would be fine."
Capacity of the street is measured as cars per hour. The slower they move, the lower is the capacity.
Dropping speed to half means capacity is not halved, but dropped 60%. And then we have a good reason to raise congestion tax as there's "so much congestion".
Of course journey times increase respectively as average speed drops. From an hour to hour and three quarters. But of course 'other peoples' journey times don't matter and 60% increase is "fine".