# Roads in the United Kingdom

The United Kingdom has a well developed and extensive network of roads totalling about 262,300 miles (422,100 km). Road distances are shown in miles or yards and UK speed limits are indicated in miles per hour (mph) or by the use of the national speed limit (NSL) symbol. Some vehicle categories have various lower maximum limits enforced by speed limiters. A unified numbering system is in place for Great Britain, whilst in Northern Ireland, there is no available explanation for the allocation of road numbers.
The earliest specifically engineered roads were built during the prehistoric British Iron Age. The road network was expanded during the Roman occupation. Some of these roads still remain to this day. New roads were added in the Middle Ages and from the 17th century onwards. Whilst control has been transferred between local and central bodies, current management and development of the road network is shared between local authorities, the devolved administrations of Scotland, Wales and Northern Ireland, and National Highways in England. Certain aspects of the legal framework remain under the control of the United Kingdom parliament.
Although some roads have much older origins, the network was heavily developed from the 1950s to the mid-1990s to meet the demands of modern traffic. Construction of roads has become increasingly problematic with various opposition groups such as direct action campaigns and environmentalists. There are various ongoing and planned road building projects.
In the UK, road safety policy is part of transport policy. "Transport 2010; The 10 Year Plan" states that the basic principle is that "people travel safely and feel secure whether they are on foot or bicycle, in a car, on a train, or bus, at sea or on a plane".

## Road network

The UK has a road network totalling about 262,300 miles (422,100 km) of paved roads—246,500 miles (396,700 km) in Great Britain (England, Scotland and Wales) and 15,800 miles (25,500 km) in Northern Ireland.

### Administration

Responsibility for the road network differs between trunk and non-trunk routes. Trunk roads, which are the most important roads, are administered by National Highways in England, Transport Scotland in Scotland, the North and Mid Wales Trunk Road Agent, and South Wales Trunk Road Agent in Wales. England's 4,300 miles (6,920 km) of trunk roads account for 33% of all road travel and 50% of lorry travel. Scotland has 2,174 miles (3,499 km) (about 7% of the total roads in Scotland), accounting for 35% of all road journeys and over 50% of lorry movements. Wales has 1,000 miles (1,600 km) of trunk roads. In London, Transport for London is responsible for all trunk roads and other major roads, which are part of the Transport for London Road Network. All other roads are the responsibility of the relevant county council or unitary authority. In Northern Ireland, DfI Roads is responsible for all 5,592 miles (8,999 km) roads. The pan-UK total is 15,260 miles (24,560 km).
Whilst generally they are trunk roads, some motorways are the responsibility of local authorities, for example the M275.
Since 2008, location marker posts have appeared on motorways and major A roads in England, situated generally at intervals of 500 metres (though the units are not given). These repeat the information given on the co-sited surveyors' marker post which, since the 1960s, have reported distances on such roads in kilometres from a datum—usually the start of the road, or the planned start-point of the road.

### Classification

Numbered roads in the UK are signed as M (Motorway), A, or B roads (legal "classification" varies between countries), as well as various categories of more minor roads: for internal purposes, local authorities may also use C, D and U (the letter standing for "Unclassified"); use of C and U numbers on signs is unusual but examples can be found in all four countries in the UK. Each road is given a number which is combined with the prefix, for example M40, A40 and B1110, although their informal or traditional names may still be used or heard occasionally: for instance, the Great North Road (now part of the A1) and the Great Cambridge Road (modern A10). These numbers follow a zonal system. There is no available explanation for the allocation of road numbers in Northern Ireland. The majority of the major inter-urban routes are motorways, and are designed to carry long-distance traffic. The next category is the primary route network, formed from parts of the A-road network. A primary route is defined as:
   ...a route, not being a route comprising any part of a motorway, in respect of which the Secretary of State —
   (a) in the case of a trunk road is of the opinion, and
   (b) in any other case after consultation with the traffic authority for the road comprised in the route is of the opinion,
   that it provides the most satisfactory route for through traffic between places of traffic importance
In Scotland, the Scottish Government has confirmed that Primary Routes should be defined by and be consistent with the trunk road network.
A new standard was set in April 2015 to formally designate certain high-quality routes as Expressways, but whether this will result in any existing road classifications changing is unclear.

#### Primary destinations

Primary destinations are usually cities and large towns, to which, as a result of their size, a high volume of traffic is expected to go. However, in rural areas, smaller towns or villages may be given primary status if located at junctions of significant roads: for example, Llangurig in Wales and Crianlarich in Scotland. As a further example, Scotch Corner in northern England is not even a village—merely a hotel and a few other buildings—yet has the status of a primary destination due to its location at the interchange of the A1 and A66 roads. For similar reasons, certain airports, sea ports, bridges and tunnels have been designated as primary destinations. Conversely, some towns with a population of over 50,000 are not primary destinations, including Woking, Chatham and Cumbernauld.
The status of both primary destinations and roads is maintained by the Department for Transport in combination with National Highways (for England), the Scottish Government and the Welsh Government. The concept of primary roads was introduced in the 1960s as part of a national reclassification of roads.

#### Regional destinations

Regional destinations are commonly used on long-distance routes throughout the country alongside primary destinations. They are displayed on signs in capitals to distinguish them from towns and cities. The boundaries of these regional destinations are not specifically defined and apply to generalised areas. The regions are: Mid Wales, North Wales, Scotland, South Wales, The East, The Lakes, The Dales, The Midlands, The North, The North East, The North West, The South, The South West and The West.

### Signage

Signage on the UK network conforms broadly to European norms, though a number of signs are unique to Britain and direction signs omit European route numbers. All length distances are shown in miles or yards, speed is in miles per hour whilst height and width restrictions are required to be shown in feet and inches (though the metric measurements may optionally also appear). In September 2007 the European Commission ruled that the United Kingdom would never be required by them to convert signs to metric.
The signage system currently in use was developed in the late 1950s and the early 1960s by the Anderson Committee, which established the motorway signing system, and by the Worboys Committee, which reformed signing for existing all-purpose (non-motorway) roads. It was introduced in 1965 and is governed by the Traffic Signs Regulations and General Directions. Signs may be of an informative, warning or instructional nature. Instructional signs are generally circular, warnings are triangular and informative signs are rectangular or square. Motorway informative signs use white text on a blue background, primary routes are indicated by green directional and distance signs with yellow text, whilst secondary roads use black text on a white background.

### Electronic signage

On 27 March 1972, the first motorway computer-controlled warning lights in the UK, with 59 miles on the M6 from Broughton, Lancashire to Barthomley, on the Cheshire boundary, and 26 miles on the M62 east of Whitefield, was switched on by Michael Heseltine and Charles Legh Shuldham Cornwall-Legh, 5th Baron Grey of Codnor at the headquarters of Cheshire Constabulary on Nuns Road.
It was centred at a police computer centre at Westhoughton, that connected to police stations in Preston and Chester. The Chester site was soon be connected to the M53 and M57. Four other regional computer centres would be opened at Perry Barr near the M6, Scratchwood near the M1, at Hook near the M3, and at Almondsbury near the M4. Most British motorways would be covered by 1975. The system was designed by GEC and had taken five years to design.

## Driving

In the UK, vehicles are normally driven or ridden on the left and required to keep to the left except when overtaking, turning right or passing pedestrians, parked vehicles and other obstructions in the road. In Great Britain, the Highway Code applies. In Northern Ireland, the Highway Code for Northern Ireland applies.
UK speed limits apply only to motor vehicles and are shown in mph. With a few exceptions, they are in multiples of 10, ranging from 20 miles per hour (32 km/h) to 70 miles per hour (113 km/h). Unless a lower speed limit is posted on a road, the national speed limit applies, which varies between class of vehicles and the type of road. In a built-up area (usually indicated by street lights), unless signs indicate otherwise, a limit of 30 miles per hour (48 km/h) applies. Other limits are shown in the table.
National speed limits on roads in the UK :
| Type of vehicle | Type of vehicle | Speed limit | Speed limit | Speed limit | Speed limit | Speed limit | Speed limit |
| Type of vehicle | Type of vehicle | Single carriageway | Single carriageway | Dual carriageway | Dual carriageway | Motorway | Motorway |
| Type of vehicle | Type of vehicle | mph | km/h | mph | km/h | mph | km/h |
| Car/motorcycle, car-derived vans up to 2 tonnes | Car/motorcycle, car-derived vans up to 2 tonnes | 60 | 97 | 70 | 113 | 70 | 113 |
| Car with caravan or trailer | Car with caravan or trailer | 50 | 80 | 60 | 97 | 60 | 97 |
| Bus, Minibus or coach up to 12 metres long | Bus, Minibus or coach up to 12 metres long | 50 | 80 | 60 | 97 | 70 | 113 |
| Bus, Minibus or coach 12 metres or longer | Bus, Minibus or coach 12 metres or longer | 50 | 80 | 60 | 97 | 60 | 97 |
| Goods vehicle below 7.5 tonnes | Goods vehicle below 7.5 tonnes | 50 | 80 | 60 | 97 | 70 | 113 |
| Goods vehicle over 7.5 tonnes | England and Wales | 50 | 80 | 60 | 97 | 60 | 97 |
| Goods vehicle over 7.5 tonnes | Scotland except A9 between Perth and Inverness | 40 | 64 | 50 | 80 | 60 | 97 |
| Goods vehicle over 7.5 tonnes | A9 between Perth and Inverness | 50 | 80 | 50 | 80 | N/A | N/A |
For a road to be classed as a dual carriageway, the two directions of traffic flow must be physically separated by a central reservation.
Enforcement of UK road speed limits increasingly uses speed guns, automated in-vehicle systems and automated roadside traffic cameras.

## Taxes and charges
### Motoring taxation

After the end of the Turnpike trusts, roads have been funded from taxation. Two new vehicle duties were introduced—the locomotive duty and the trade cart duty in the 1888 budget. Since 1910, the proceeds of road vehicle excise duties were dedicated to fund the building and maintenance of the road system. From 1920 to 1937, most roads in the United Kingdom were funded from the Road Fund using taxes raised from fuel duty and Vehicle Excise Duty. Since 1937, roads have been funded from general taxation with all motoring duties, including VAT, being paid directly to the Treasury.

### Tolls and congestion charges

Tolls or congestion charges are used for some major bridges and tunnels, for example the Dartford Crossing has a congestion charge. The M6 Toll, originally the Birmingham Northern Relief Road, is designed to relieve the M6 through Birmingham, which is one of the most heavily used roads in the country. There were two public toll roads (Roydon Road in Stanstead Abbots and College Road in Dulwich) and about five private toll roads.
Since 2006, congestion charging has been in operation in London and in Durham.
Before 14 December 2018, the M4's Second Severn Crossing (officially 'The Prince of Wales Bridge') included tolls. However, after being closed for toll removal for three days, the bridge opened up again on 17 December starting with a formal ceremony. Toll payment was scrapped and it marked history as it is believed to be the first time in 400 years that the crossing will be free.
Since the abolition of tolls on the Forth and Tay Road Bridges in 2008, there are no longer any toll roads in Scotland.

## Road traffic safety

In June 2008, the Road Safety Foundation reported that 30 per cent of the primary route network in Great Britain failed to rate as safe, and a quarter of all motorways were outside the safest risk band.
In 2006, the 8-mile (13 km) Cat and Fiddle Road between Macclesfield and Buxton was named as Britain's most dangerous road. The single-carriageway road has been the scene of 43 fatal or serious collisions since 2001, nearly three-quarters of them involving motorcyclists. When collisions involving motorcyclists are removed from the analysis, the A61 between Barnsley and Wakefield was found to be the most dangerous road in Britain.
Between 2003 and 2006, the most improved safety record was for the A453 from the A38 to Tamworth in Staffordshire. This rural single carriageway saw an 88 per cent drop in the number of fatal or serious collisions in the last six years, taking it from a medium risk road to one of the safest. According to the Foundation, this has been achieved by introducing traffic lights, speed limit reductions and village pedestrian facilities.
Research undertaken in July 2008 has shown that investment in a safe road infrastructure programme could yield a one-third reduction in road deaths, saving as much as £6 billion per year. A consortium of 13 major road safety stakeholders have formed the Campaign for Safe Road Design, which is calling on the UK Government to make safe road design a national transport priority.

## History
### Iron Age

The earliest evidence of engineered roads dates back to the 1st century BC. A metalled and cambered road, 1.5 metres high and six metres wide, was unearthed at Bayston Hill quarry, near Shrewsbury. A timber road was preserved in peat in Geldeston, Norfolk, with tree rings suggesting a date of 75 BC, probably built by the Iceni tribe.

### Roman Britain

Roads built in the first phase of Roman occupation (43–68 AD) connected London with the ports used in the invasion (Chichester and Richborough), and with the earlier legionary bases at Colchester (Camulodunum), Lincoln (Lindum), Wroxeter (Viroconium), Gloucester and Exeter. As Roman influence expanded, so did the network, until around 180 AD when the known network was complete.
Few Roman roads extended into Scotland due to their inability to subjugate the local population. Part of the Scottish Lowlands came under Roman control in 142 AD, and the Antonine Wall was constructed on the northern boundary. However, the Roman legions withdrew in 164 AD to their former northern boundary, Hadrian's Wall.
The primary function of Roman roads was to allow the rapid movement of troops and military supplies, but it also provided vital infrastructure for trade and the transport of goods. The roads were paved, a first for the island, and could carry heavy goods in all weathers. Following the Roman withdrawal from Britain, road maintenance became a very ad hoc activity.

### Medieval roads

A network of roadways was developed in Britain in the Middle Ages to supplement the use of rivers as a system of transportation. Many of these roadways were developed as a result of trading of goods and services, such as wool, sheep, cattle and salt. They linked together market towns, towns with bridges, harbours and ports. Other roadways developed to meet the needs of pilgrims visiting shrines, such as Walsingham, and for transporting corpses from isolated communities to local graveyards.

#### The "Four Highways" of medieval England

The Icknield Way was one of four highways that appear in the literature of the 1130s. Henry of Huntingdon wrote that the Ermine Street, Fosse Way, Watling Street and Icknield Way had been constructed by royal authority.

### Early modern era

The first legislated control in England was introduced under the Highways Act 1555. Road rates were introduced in England and Wales in the 17th century. The first turnpike road, whereby travellers paid tolls to be used for road upkeep, was authorised by the Highways Act 1663 for a section of the Great North Road in Hertfordshire. The first turnpike trust was established by the Parliament of England through a Turnpike Act in 1706. Scotland continued to maintain its own Parliament until the Acts of Union 1707, when the two parliaments merged to form the Kingdom of Great Britain.
In the second half of the 18th century, turnpike trusts became numerous, with trusts also set up in Wales and lowland Scotland. This expansion was facilitated by the ability to use mortgages to fund the work. By 1821 there were 18,000 miles (29,000 km) of turnpike roads in England, with 1,000 trusts by 1845.
Also, in England, the process of land owners enclosing land had been happening since medieval times. During the 17th century a practice developed of obtaining authorisation by Act of Parliament. The statutory process included the appointment of enclosure commissioners. Commissioners were given authorisation to replace old roads and country lanes with new roads that were wider and straighter than those they replaced. Straight roads of early origin, if not Roman were probably enclosure roads. They were established in the period between 1750 and 1850.
The high cost of tolls, on the turnpikes, caused social unrest in Wales. A protest against the tolls that became known as the Rebecca Riots took place, in Wales, between 1839 and 1843. The riots ceased after some ringleaders, John Jones (Shoni Sguborfawr) and David Davies (Dai'r Cantwr), were convicted and transported to Australia. Following several attempts at reform, detrunking began in the 1860s with the last trust ending in 1885. The protests prompted several reforms, including a royal commission into the question of toll roads. The growing popularity of cycling also prompted calls for road improvements, with the Cyclists' Touring Club and National Cyclists' Union pooling resources to form the Roads Improvement Association in October 1886; this focused on producing technical literature distributed to highways boards and surveyors to promote improved construction and maintenance methods. The Local Government Act 1888 created borough and county councils with responsibility for maintaining the major roads.
After complaints about the first tram companies damaging the road surface, Parliament introduced the Tramways Act 1870 (33 & 34 Vict. c. 78), making tram companies responsible for the maintenance of the shared surface of the tramway and several feet either side, as a condition of being granted a licence. This was a popular move as maintenance was removed from the public purse. The local authority could also purchase the whole line at a later date at a discount, or force the tram company to reinstate the road.

### 1900–1950

The Roads Act 1920 brought in the Road Fund, with the government receiving revenue from excise duty on road vehicles and from the sale of licences for horse-drawn carriages and driving licences. As road traffic began to grow, the condition of the road network became an issue, with most of it in a poor state of repair. The new Ministry of Transport created a classification system for the important routes connecting large population centres or for through traffic, with the definitive list being published in 1922/3 and revised in 1926/7.
High unemployment after the end of World War I led the Minister of Transport to provide grant funding to the county councils to improve roads, particularly where labour was recruited from areas of high unemployment and adjoining areas, and men with dependants. Two unemployment relief programmes were run, the first from 1920 to 1925 and the second from 1929 to 1930. Government grants were limited to trunk roads and bridges, with the money coming from the Road Fund. Some 500 miles (800 km) of bypasses were built by 1935, about half of what was originally planned at the start of the programmes. In 1930, responsibility for all roads was vested in the county councils. The first inter-urban new road built in the UK was the East Lancs Road, which was built between 1929 and 1934 at a cost of £8 million.
For the first time since the Roman occupation, the Ministry of Transport took direct control of the core road network through the Trunk Roads Act 1936. During the 1930s, both the Institution of Highway Engineers and The County Surveyors' Society had published plans for a network of high-speed roads, whilst the Minister of Transport, Leslie Burgin, also visited the autobahn under construction in Germany. Lancashire County Council proposed a new scheme for a motorway and it was agreed to go ahead. This was, however, postponed due to the start of World War II.
During World War II, government plans were drawn up to create a new network of high-speed routes across the country. The passing of the Special Roads Act 1949 gave the government legal powers to build roads that were not automatically rights of way for certain types of user.

### 1950–1979

In 1958, the first motorway was opened as the Preston Bypass, now part of the M6 motorway. The first major motorway to open was the M1 between Crick and Berrygrove.
In 1963, a report on urban transport planning policy, Traffic in Towns, was produced for the UK Department of Transport by a team headed by the architect, civil engineer and planner Colin Buchanan. While it advocated the construction and reorganisation of towns to accommodate the motor car and lorry, it stressed that this would have to be balanced with restrictions, in accordance with local needs. It highlighted the urgency of the problem of dealing with the expected massive growth in road traffic, the damage it could cause to our towns and cities if unplanned, the eventual need for demand management but with implications of restricting the mass of the population from doing something they didn't see as wrong, and of the inevitable need for a change in policy as the social costs increased.
In 1966, a revision of design standards was proposed which would, it was stated, save "acres of land" and £22,000 per mile in construction costs. The revision involved reducing from 10 ft (3.0 m) to 5 ft (1.5 m) the width of roadside grass verges on newly constructed "rural" motorways, and removing 1-foot (0.30 m) of the width of the "marginal strips" that separated each carriageway from the central reservation.
The 1968–1969 Ministry of Transport report Roads in England planned to complement the new interurban routes with £1 billion of new urban trunk roads outside London in order to "alleviate traffic congestion", complemented by parking controls, traffic management and public transport.
The first 1,000 miles (1,600 km) of motorway had been built by 1972, followed by more motorways opened into the 1980s.
Roads outside urban areas continued to be built throughout the 1970s, but the urban routes soon ran into opposition. Plans by the Greater London Council for a series of ringways were cancelled following extensive protests headed by Homes before Roads and a rise in costs. Plans to widen the Archway Road in London were also hit by determined opposition over a 20-year period from the 1970s.
Work on planning motorways in Northern Ireland had begun before the Second World War, but the legal authority for motorways was not provided for until the Special Roads Act (Northern Ireland) 1963, similar to that in the 1949 Act. The first motorway to open was the M1 motorway in 1962, though did so under temporary powers until the Special Roads Act had been passed. Work on the motorways continued until the 1970s, when the oil crisis and The Troubles both intervened, causing the abandonment of many schemes.

### 1979–1997

The Conservative government of Margaret Thatcher from 1979 adopted a pro-roads policy. During this period, numerous road upgrades were built and the M25 motorway was completed. In 1989, it announced a large-scale roads programme (stated to be the largest since the Romans) in the Roads for Prosperity White Paper. It proposed 500 road schemes at a cost of £23 billion and predicted an increase of road traffic of 142% by 2025. It would have involved the doubling of the trunk road capacity with around 150 bypasses being built, caricatured in later years as predict and provide, whereby the government predicted the required capacity in forthcoming years and built roads to match. From 1985 to 1995, the road network expanded by 24,000 miles (38,624 km).
This road building programme continued into the start of the premiership of John Major. In the early-1990s, the government decided to complete the M3 motorway by building a six-lane road in a cutting through Twyford Down. This attracted the first direct action protests against a major road in the country. Building work was delayed considerably, and anti-roads protesters gained large amounts of publicity. The Newbury bypass saw some of the largest protests against a road in the UK. Proposed originally in the 1980s, the bypass was subject to strong support and opposition. Also in this time frame, the M11 link road protest saw protracted disturbance during the upgrading of a section of the A12 through East London. Costs increased rapidly, the Newbury bypass being 50% over budget and many other schemes showed increases of 100%.
The Standing Advisory Committee on Trunk Road Assessment had also concluded in 1994 that building new roads simply generated more traffic, and was therefore largely self-defeating. By 1994, following the recession of the early 1990s, a significant number of remaining schemes were cancelled, although the government still intended to continue with others using private financing. The Secretary for state for transport, Dr Brian Mawhinney launched a "Great Debate" about the future direction for transport in the UK and the required level of road building stating that the road network was "broadly complete".
A major Royal Commission report, "Transport and the Environment", was published in October 1994 to highlight the serious environmental consequences of UK's transport system in response to which the New Scientist commented "Rarely, if ever, can a ministry have emerged so badly from an official report as John MacGregor's old department" in an article titled "Head-on collision over transport: The British government has received its sternest warning yet that its unflagging support for the car is seriously at odds with its own green principles".
The last new motorway in the United Kingdom (The M3 motorway in Northern Ireland) opened in 1994. In 1996 the total length of motorways reached 2,000 miles (3,200 km).

### 1997–present day

After the election of the Labour government in 1997, most remaining road schemes were cancelled and problem areas of the road network subject to multi-modal studies to investigate non-road alternatives, following the introduction of the A New Deal for Trunk Roads in England White Paper.
In 1998, it was proposed to transfer parts of the English trunk road network to local councils, retaining central control for the network connecting major population centres, ports, airports, key cross-border links and the Trans-European Road Network. Around 40% of the network was transferred to local authorities.
In 2002, the government proposed a new major road building program with 360 miles (580 km) of the strategic road network to be widened, 80 major new trunk road schemes to improve safety and 100 new bypasses on trunk and local roads. The protesters reformed.
In 2004, the Government announced in the Queen's speech a major new funding source from transport schemes, the Transport Innovation Fund (TIF).
In 2007, a new Planning Bill was introduced to parliament which would speed up the process of approving new roads and other transport infrastructure but which has raised concerns that it may erode democracy and be a "developer's charter".
Traffic has increased by 80% between 1980 and 2005 whilst road capacity has increased by 10%.
In 2011, Transport Scotland proposed a plan to dual the A9 between Perth and Inverness with construction to start in September 2015 and to finish in 2035. Another plan is underway to do the same to the A96 between Aberdeen and Inverness.
On 4 June 2018, a change in the law meant that learner drivers, who had previously been banned from driving on motorways, were allowed to use them when accompanied by a driving instructor in a car with dual controls. As motorway driving is not offered as part of the practical driving test in the United Kingdom, these measures were put in place in an effort to teach motorway safety.
In the 2020s, there was a policy shift away from "predict and provide" to "decide and provide" in which transport planning aims to achieve a desired level of road use rather than unconstrained growth as before, also aiming to secure Net Zero. This concept was developed by the TRICS Consortium; Oxfordshire County Council was the first local authority to adopt it formally as Council policy.

## Naming

Road names have traditional conventions in the UK.