Sir – The argument about 20mph will continue ad infinitum until its critics understand why lower speeds, however imperfectly adhered to as yet, are welcomed by most road users not behind a driving wheel — and increasingly by drivers too.

Above all, people want to be able to enjoy their public spaces without the noise and intimidating effect of fast-moving traffic, and in narrow crowded streets, 30mph seems very fast.

When drivers, pedestrians and cyclists have time for eye contact, the atmosphere becomes more civilised and risk of conflict is reduced.

As Mr McArthur-Christie (Letters, March 25) admits, shared space throughout the city would be preferable, but that would cost far more than the £300,000 currently begrudged for the 20mph speed limit.

The aim of lower speed campaigners has never been to punish motorists, even the Advanced variety, but simply to improve quality of life for all road users.

As with many new rules, such as those on seatbelts, phone use and drink-driving, compliance is not instantaneous, but would come more quickly if there were less ill-informed and sometimes spiteful criticism muddying the issue.

RH Jones, Oxford Pedestrians Association