Why the Government scrapped plans to convert UK speed limit signs to km/h in 1970

On 9 December 1970, the Minister for Transport Industries John Peyton announced that the Government have decided that speed limits will not be made metric in 1973 and have no alternative date in mind. Why did the Government scrap the metrication of speed limits? Historical government documents give various reasons for scrapping the planned conversion. This article will show some of these documents, which reveal the reasons the Government gave for its decision.

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Government cost estimates to convert all UK speed limit signs to km/h in 1970 were far below £30 million in today’s money

The British Government once developed and examined proposals to change all UK speed limit signs from miles per hour to kilometres per hour in the 1960’s and in 1970. On 9 December 1970, the Minister for Transport Industries John Peyton announced that the proposed metrication of speed limit signs would not go ahead and was postponed indefinitely. The proposed change to metric speed limits was due to be implemented in 1973. Fifty years have now passed since then. Half a century later, UK speed limit signs are still in imperial units. The Department for Transport (DfT) now claims that metricating UK road signs costs too much. However, it would have cost little to convert all UK road signs to metric units according to cost estimates by the Department of the Environment (DoE), which had responsibility for transport at the time, according to historical government documents held at the National Archives.

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Welsh road signs in 2022 cost small fraction of DfT estimates in cash terms despite 50% inflation since 2006 DfT metric conversion report

The total estimated cost for implementing the speed limit change from 30 mph to 20 mph, including the cost for changing signs and markings on roads, has been published in the Regulatory Impact Assessment (RIA) undertaken by the Welsh Government on 20 mph speed limits. The published document gives a breakdown of road sign costs. These costs are several times lower than the Department for Transport (DfT) cost estimates of conversion of road traffic signs to metric units in cash terms despite 50% inflation during the 16-year period between the two reports.

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REUL Impact Assessment described as “not fit for purpose”

On 15 November 2022, I condemned the Department for Business, Energy and Industrial Strategy (BEIS) for failing to produce an impact assessment on the Retained EU Law Bill. One week later, BEIS published its impact assessment (IA). Its IA document looks like a blank form with notes for someone else to fill in the blanks. No actual figures are provided for changes or deletions of any affected laws. So it is no surprise that the Regulatory Policy Committee (RPC), an advisory Non-Departmental Public Body of BEIS, has described the IA as “not fit for purpose”.

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DfT has done no cost-benefit analysis on metrication of road signs

Ronnie Cohen draws some conclusions from a recent Freedom of Information (FoI) request that he made to the UK Department for Transport (DfT).

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DfT cost claims busted

The UK Department for Transport (DfT) now puts forward cost as the principal reason for the failure to convert road traffic signs to metric. Ronnie Cohen reports on a major study he has recently carried out, using the Freedom of Information Act, to find out the actual costs of replacing and installing traffic signs. He finds that the DfT estimate of cost, published in 2006, bears little relation to reality.

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