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Data Definitions

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Introduction

There are 3 types of definition as listed below:

· Road categories: Provides the definitions for the different road types used by the Department for Transport.

· Data table descriptions: Provides the data item name, the label name and a data description for the data sets that can be downloaded from this web site. The data includes network and annual average daily traffic flows.

· Look-up table descriptions: Shows the data item name, heading label and data description for the look-up tables for the local Highway authority, the regions and the road categories.

Look-up tables

· Look-up table values: Lists the local Highway authorities, the regions and the road categories in the look-up tables.

Road Classes

Road Classes Diagram

· Major roads: Include motorways and A roads. These roads usually have high traffic flows and are often the main arteries to major destinations.

· Motorways: Major roads often used for long distance travel. They are usually three or more lanes in each direction and generally have the maximum speed limit of 70mph.

· A Roads: Can be trunk or principal roads. These are often described as ‘main’ roads and tend to have heavy traffic flows though not as high as motorways.

· Trunk roads: Most motorways and many of the long distance rural A roads are trunk roads. The responsibility for their maintenance lies with the Secretary of State and they are managed by the Highways Agency in England, the National Assembly of Wales in Wales and the Scottish Executive in Scotland (National Through Routes).

· Principal roads: These are major roads maintained by local authorities. They are mainly A roads (though the local authorities do have responsibility for some motorways) and tend to be in urban areas.

· Minor roads: These are B roads, C roads and unclassified roads and are all maintained by the local authorities. Data for minor roads are unavailable.

· Urban roads: Major and minor roads within an urban area, i.e. an area with a population of 10,000 or more. The urban areas used are based on 2001 Census data. The definition is based on the 2001 'urban settlement' and is available in Urban and rural area definitions: a user guide which can be found on the DCLG web site at:

http://www.communities.gov.uk/planningandbuilding/planningbuilding/planningstatistics/urbanrural/

· Rural roads: All other roads, i.e. those outside urban areas (urban areas having a population of 10,000 or more - see above).

Measures of traffic

· Count Point (CP): Traffic estimates are calculated for each link of Great Britain's major road network, with links' start and end points defined as where the link joins a major road junction. Each link has a uniquely referenced Count Point (CP), where the traffic is usually counted by enumerators. Enumerators are not employed where (a) the CP is dependent upon another CP, i.e. the traffic estimate is calculated for each side of a Local Authority boundary, or (b) the traffic estimate is derived from neighbouring CPs' traffic estimates. Unlike the major road network (where every link has a CP), there are CPs on a sample only of minor roads.

· Annual Average Daily Flow (AADF) - measured in number of vehicles: The average over a full year of the number of vehicles passing a point in the road network each day.

· Traffic - measured in vehicle kilometres: One vehicle times one kilometre travelled times the numbers of days in the year (vehicle kilometres are calculated by multiplying the AADF by the corresponding length of road factored up by the numbers of days in the year). For example, 1 vehicle travelling 1 kilometre a day for a year would be 365 vehicle kilometres. This is sometimes known as the volume of traffic. The output statistics are presented as 1,000s of vehicle kilometres. For instance, a CP with a traffic volume of 20,000 vehicle kilometres in one year will be presented as 20.0.

Data Table Descriptions

Major Roads Network

Data item name	Heading label	Description
LACode	LACode	Local Highway Authority (Administrative) code number - unique reference. See the look-up table LACode below.
CP	CountPoint	Count point reference number (UNIQUE).
dOpened	dOpened	Date road link opened.
dClosed	dClosed	Date road link closed.
Road	Road	Road classification number.
RdSeq	RdSeq	Road sequence number.
RCat	Category	Road category at count point. See the look-up table RCat below.
LenNet	Length	Total length of network road link - kilometres.
SRefE	CPEast	OS grid reference at site of count point: Easting - British National Grid.
SRefN	CPNorth	OS grid reference at site of count point: Northing - British National Grid.
Closed	Closed	Indicator - road closed or reclassified as minor road.

Annual Average Daily Flows (AADF) and Traffic

Data item name	Heading label	Description
CP	CountPoint	Count point reference number (UNIQUE).
Year	Year	The year of the last traffic count.
FdPC	Bicycles	AADF / TRAFFIC: Pedal cycles.
Fd2WMV	M'cycles	AADF / TRAFFIC: Two wheeled motor vehicles. Includes motorcycle combinations, scooters and mopeds.
FdCar	Cars	AADF / TRAFFIC: Cars and Taxis. Includes estate cars, light vans with windows to the rear of the driver's seat, passenger vehicles with 9 or fewer seats, three-wheeled cars, motorised invalid carriages, Land Rovers, Range Rovers and Jeeps. Cars towing caravans or trailers are counted as one vehicle.
FdBus	Buses	AADF / TRAFFIC: Buses and Coaches. Public service vehicles and works buses, which have a gross vehicle weight greater than 3,500kgs.
FdLGV	Vans	AADF / TRAFFIC: Light Goods Vehicles. Goods vehicles up to 3,500 kgs. gross vehicle weight. Includes all car-based vans and those of the next larger carrying capacity such as transit vans. Also included are ambulances, pickups, milk floats and pedestrian controlled motor vehicles. Most of this group are delivery vans of one type or another.
FdHGVR2	HGVr2	AADF / TRAFFIC: Rigid 2-axle Heavy Goods Vehicles.¹
FdHGVR3	HGVr3	AADF / TRAFFIC: Rigid 3-axle Heavy Goods Vehicles.¹
FdHGVR4	HGVr4	AADF / TRAFFIC: Rigid 4plus-axle Heavy Goods Vehicles.¹
FdHGVA3	HGVa3	AADF / TRAFFIC: Articulated 3 or 4-axle Heavy Goods Vehicles.¹
FdHGVA5	HGVa5	AADF / TRAFFIC: Articulated 5-axle Heavy Goods Vehicles.¹
FdHGVA6	HGVa6	AADF / TRAFFIC: Articulated 6plus-axle Heavy Goods Vehicles.¹
FdHGV	HGV	AADF / TRAFFIC: Heavy Goods Vehicles total.¹
FdAll_MV	AllMV	AADF / TRAFFIC: All Motor Vehicles total.

Footnote:
1. Goods vehicles over 3,500 kgs gross vehicle weight. Includes tractors (without trailers), road rollers, box vans and similar large vans. A two axle motor tractive unit without trailer is also included.

Look-up table descriptions

LACode - Local Highway Authority

Data item name	Heading label	Description
RegG	RegNo	Regional Office number. See the look-up table Region below.
LACode	LACode	Local Highway Authority Code number.
LName	LocalHighwayAuthority	Local Highway Authority name.

Region - Government Office Region

Data item name	Heading label	Description
RegG	RegNo	Regional Office number.
RName	Region	Regional Office name.

RCat - Road category

Data item name	Heading label	Description
RCat	Category	Road Category (at Count Point if on Link).
RCatName	CategoryDescription	Road Category description

Look-up table values

LACode - Local Highway Authority

RegNo	LACode	LocalHighwayAuthority
10	110	Bath and North East Somerset Council
10	120	Bristol City Council
10	130	North Somerset Council
10	140	South Gloucestershire Council
7	205	Luton Borough Council
7	225	Bedfordshire County Council
9	305	Bracknell Forest Borough Council
9	310	West Berkshire Council
9	315	Reading Borough Council
9	320	Slough Borough Council
9	325	Royal Borough of Windsor and Maidenhead
9	330	Wokingham District Council
9	415	Milton Keynes Council
9	430	Buckinghamshire County Council
7	505	Peterborough City Council
7	515	Cambridgeshire County Council
2	605	Halton Borough Council
2	610	Warrington Borough Council
2	615	Cheshire County Council
1	710	Hartlepool Borough Council
1	720	Redcar and Cleveland Borough Council
1	730	Middlesbrough Borough Council
1	740	Stockton-on-Tees Borough Council
10	810	Cornwall County Council
10	835	Council of the Isles of Scilly
2	900	Cumbria County Council
5	1020	Derby City Council
5	1050	Derbyshire County Council
10	1105	Plymouth City Council
10	1110	Torbay Council
10	1115	Devon County Council
10	1205	Bournemouth Borough Council
10	1225	Borough of Poole Council
10	1245	Dorset County Council
1	1305	Darlington Borough Council
1	1310	Durham County Council
9	1405	Brighton & Hove Council
9	1410	East Sussex County Council
7	1505	Southend-on-Sea Borough Council
7	1510	Thurrock Borough Council
7	1515	Essex County Council
10	1600	Gloucestershire County Council
9	1745	Portsmouth City Council
9	1755	Southampton City Council
9	1770	Hampshire County Council
6	1810	Worcestershire County Council
6	1815	Herefordshire County Council
7	1900	Hertfordshire County Council
4	2010	Kingston Upon Hull City Council
4	2020	North East Lincolnshire Council
4	2036	East Riding of Yorkshire Council
4	2040	North Lincolnshire Council
9	2100	Isle of Wight Council
9	2205	Medway Council
9	2210	Kent County Council
2	2305	Blackburn with Darwen Borough Council
2	2310	Blackpool Borough Council
2	2315	Lancashire County Council
5	2425	Leicester City Council
5	2445	Rutland Council
5	2450	Leicestershire County Council
5	2500	Lincolnshire County Council
7	2600	Norfolk County Council
4	2705	North Yorkshire County Council
4	2710	York City Council
5	2800	Northamptonshire County Council
1	2900	Northumberland County Council
5	3005	Nottingham City Council
5	3010	Nottinghamshire County Council
9	3100	Oxfordshire County Council
6	3205	Telford and Wrekin Council
6	3210	Shropshire County Council
10	3300	Somerset County Council
6	3440	Stoke-on-Trent City Council
6	3450	Staffordshire County Council
7	3500	Suffolk County Council
9	3600	Surrey County Council
6	3700	Warwickshire County Council
9	3800	West Sussex County Council
10	3920	Swindon Borough Council
10	3930	Wiltshire County Council
2	4205	Bolton Metropolitan Borough Council
2	4210	Bury Metropolitan Borough Council
2	4215	Manchester City Council
2	4220	Oldham Metropolitan Borough Council
2	4225	Rochdale Metropolitan Borough Council
2	4230	Salford City Council
2	4235	Stockport Metropolitan Borough Council
2	4240	Tameside Metropolitan Borough Council
2	4245	Trafford Metropolitan Borough Council
2	4250	Wigan Metropolitan Borough Council
2	4305	Knowsley Metropolitan Borough Council
2	4310	Liverpool City Council
2	4315	St.Helens Metropolitan Borough Council
2	4320	Sefton Metropolitan Borough Council
2	4325	Wirral Metropolitan Borough Council
4	4405	Barnsley Metropolitan Borough Council
4	4410	Doncaster Metropolitan Borough Council
4	4415	Rotherham Metropolitan Borough Council
4	4420	Sheffield City Council
1	4505	Gateshead Metropolitan Borough Council
1	4510	Newcastle City Council
1	4515	North Tyneside Borough Council
1	4520	South Tyneside Metropolitan Borough Council
1	4525	Sunderland Borough Council
6	4605	Birmingham City Council
6	4610	Coventry City Council
6	4615	Dudley Metropolitan Borough Council
6	4620	Sandwell Metropolitan Borough Council
6	4625	Solihull Metropolitan Borough Council
6	4630	Walsall Metropolitan Borough Council
6	4635	Wolverhampton Metropolitan Borough Council
4	4705	Bradford City Council
4	4710	Calderdale Metropolitan Borough Council
4	4715	Kirklees Metropolitan Borough Council
4	4720	Leeds City Council
4	4725	Wakefield Metropolitan Borough Council
8	5030	City of London
8	5060	London Borough of Barking and Dagenham
8	5090	London Borough of Barnet
8	5120	London Borough of Bexley
8	5150	Brent Borough Council
8	5180	Bromley Borough Council
8	5210	Camden Borough Council
8	5240	London Borough of Croydon
8	5270	London Borough of Ealing
8	5300	Enfield Borough Council
8	5330	Greenwich Borough Council
8	5360	London Borough of Hackney
8	5390	Hammersmith and Fulham Borough Council
8	5420	Haringey Borough Council
8	5450	London Borough of Harrow
8	5480	Havering Borough Council
8	5510	London Borough of Hillingdon
8	5540	Hounslow Borough Council
8	5570	Islington Borough Council
8	5600	Royal Borough of Kensington and Chelsea
8	5630	Royal Borough of Kingston-upon-Thames
8	5660	London Borough of Lambeth
8	5690	London Borough of Lewisham
8	5720	London Borough of Merton
8	5750	London Borough of Newham
8	5780	Redbridge Borough Council
8	5810	Richmond upon Thames Borough Council
8	5840	Southwark Borough Council
8	5870	Sutton Borough Council
8	5900	Tower Hamlets Borough Council
8	5930	Waltham Forest Borough Council
8	5960	Wandsworth Borough Council
8	5990	City of Westminster Council
11	6005	Conwy County Borough Council
11	6010	Denbighshire County Council
11	6015	Flintshire County Council
11	6020	Powys County Council
11	6025	Wrexham County Borough Council
11	6105	Ceredigion County Council
11	6110	Carmarthenshire County Council
11	6115	Pembrokeshire County Council
11	6205	Blaenau Gwent County Borough Council
11	6215	Monmouthshire County Council
11	6220	Newport County Borough Council
11	6225	Torfaen County Borough Council
11	6305	Isle of Anglesey County Council
11	6310	Gwynedd Council
11	6405	Bridgend County Borough Council
11	6410	Caerphilly County Borough Council
11	6415	Cardiff County Council
11	6420	Merthyr Tydfil County Borough Council
11	6425	Rhondda, Cynon, Taff County Borough Council
11	6430	The Vale of Glamorgan Council
11	6705	Neath Port Talbot County Borough Council
11	6710	City and County of Swansea
12	9100	Aberdeen Council
12	9110	Aberdeenshire Council
12	9120	Angus Council
12	9130	Argyll and Bute Council
12	9140	Scottish Borders Council
12	9150	Clackmannan Council
12	9160	West Dunbartonshire Council
12	9170	Dumfries and Galloway Council
12	9180	Dundee City Council
12	9190	East Ayrshire Council
12	9200	East Dunbartonshire Council
12	9210	East Lothian Council
12	9220	East Renfrewshire Council
12	9230	Edinburgh City Council
12	9240	Falkirk Council
12	9250	Fife Council
12	9260	Glasgow City Council
12	9270	Highland Council
12	9280	Inverclyde Council
12	9290	Mid Lothian Council
12	9300	Moray Council
12	9310	North Ayrshire Council
12	9320	North Lanarkshire Council
12	9330	Orkney Islands Council
12	9340	Perth and Kinross Council
12	9350	Renfrewshire Council
12	9360	Shetland Islands Council
12	9370	South Ayrshire Council
12	9380	South Lanarkshire Council
12	9390	Stirling Council
12	9400	West Lothian Council
12	9410	Eilean Siar Council (W. Isles)