The Motor Car Act 1903 (3 Edw. 7. c. 36) was an act of the United Kingdom Parliament that received royal assent on 14 August 1903, which introduced motor vehicle registration, driver licensing and increased the speed limit.
The act followed the Locomotives on Highways Act 1896 (59 & 60 Vict. c. 36) which had increased the speed limit for motorcars to 14 mph from the previous 4 mph in rural area and 2 mph in towns.
There were some who wished to see the speed limit removed altogether. The influential Automobile Club (soon to become the Royal Automobile Club or RAC) was split on the subject; the chair of the working group on the bill was John Douglas-Scott-Montagu MP who took a moderate line supporting speed limits, but was opposed on this by the chairman of the organisation Roger Wallace who were 'strongly against any speed limit' and described Montagu as a 'traitor'. The secretary of the club publicly proposed a 'compromise' of 25 mph without authorisation. Parliamentary debates were described as 'bitter'.
The Local Government Board issued a circular on10 March 1904, Motor Car Use and Construction, which set out four standard designs for traffic signs:
Local authorities started placing such traffic signs. The first three designs are the ancestors of modern traffic signs. Warning signs of a dangerous corner survive on the approach to the car park at Carisbrooke Castle, Isle of Wight.
The actwas intended to expire after three years but was extended via the Expiring Laws Continuance Acts until the Road Traffic Act 1930(20 & 21 Geo. 5. c. 43) repealed and replaced it and the Locomotives on Highways Act 1896 (59 & 60 Vict. c. 36).
A Royal Commission on Motor Cars was established in 1905 which reported in 1906 and recommended that motorcars should be taxed, that the speed limit should be abolished (by a majority vote only) and raised concern about the manner in which speed traps were being used to raise revenue in rural areas rather than being used to protect lives in towns. Amendments were discussed in 1905, 1911, 1913 1914 under the titles Motor Car Act (1903) Amendment bill and Motor Car Act (1903) Amendment (No 2) bill.
In the Irish Free State, the 1903 act was likewise continued by annual Expiring Laws Acts, until the Road Traffic Act 1933 repealed both the 1896 and 1903 acts.