Martin Underwood wrote:

The main road from Beaconsfield to Slough is mainly 30 but has 20
limits for about 50 yards either side of every traffic light junction
over a half-mile stretch - I think there are four of them. I cannot
help thinking that traffic which has priority is being penalised for
the sins of pedestrians and othe drivers who fail to observe the
traffic lights - but this seems to be morally acceptible in this
Brave New World.

Come on, Martin. Get a sense of perspective. Even if you are coasting
non-stop through the lights, each 100 yard block of 20mph running adds
under 4 seconds to your journey.
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http://gallery120232.fotopic.net/p9767288.html
(Gatwick Express, Mark 1: 4VEG unit 7910 at London Victoria in 1980)