In message , at 11:52:11 on Mon, 5 Nov
2018, John Williamson remarked:
Wrong. The aim should be to reduce *pollution*, not to reduce polluting
vehicles. What's worse, a hundred polluting vehicles entering the zone
once a year each, or a single polluting vehicle entering every day?
Obviously the latter.
Changing it to "reducing the number of polluting *trips*"
encompasses both ideas, but still shows that its the regular
commuters/deliveries rather than people visiting Auntie Flo on her
birthday who need to be discouraged.

Something that might help somewhat, and would be virtually free to
implement,would be to make the congestion charge apply 24/7 rather than
just on weekdays.

No, that's the opposite, and would penalise the Auntie Flo trips while
failing to further penalise the commuters/deliveries.

Although I could support a 24x7 charge if every vehicle had (say) a
dozen free trips a year; you could call it "Aunt Flo's Law".
--
Roland Perry