I should be a cheerleader for low-traffic neighbourhoods (LTNs). I have spent much of the past 40 years campaigning for traffic reduction. And yet, I oppose them.
I recognise their merits, such as less noise and air pollution, safer streets for walking and cycling, and more pleasant places to live.
But, this can be at the expense of more traffic on adjacent boundary roads, including main roads. These are already the most heavily-trafficked. To guide yet more cars and lorries to them raises the question of environmental justice.
Of course, main roads, by their very nature, will have a lot of traffic. They are through roads. They are the places where people work, shop, socialise and go to school. They can be full of pedestrians and cyclists, buses and taxis.