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Highway Authority Network Classification System

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Comparing crash rates between highway authorities can be misleading due to the variation in road characteristics across the country. For example, it is unlikely that comparing the crash rate in central London to the crash rate in the Shetland Islands will provide a meaningful assessment of performance. In order to address this issue, Road Safety Analysis have devised a classification system which groups similar authorities together so that meaningful comparisons can be made. From January 2014 the RSA Highway Authority Network Classification System Dimension is included in MAST.

The classification system is based on ‘Network Density’ which is calculated by dividing the total length of roads (km) in a highway authority by the area (km²) of the highway authority. This ‘Network Density’ value gives an indication of how urban an authority is and authorities with similar network density values tend to have similar crash rates. When plotting the crash rate index values against the network density values a correlation was evident with road risk generally increasing as the network density increased. Percentage of urban roads in an authority, as defined by the Department for Transport, are also used in the classification system. Grouping highway authorities using the ‘network density’ and ‘percentage urban roads’ figures led to the creation of 5 super-groups and 11 sub-groups. The parameters for these are shown in the following table:

Sub-Group Sub-Group Description Super-Group Network Density Range Urban Road Range
A1 Very densely networked, super urban London Boroughs A 16+ 97+
B2 Very densely networked super urban authorities not in London B 16+ 90-99
B3 Fairly densely networked, very urban authorities B 10-15.99 90+
C4 Fairly densely networked fairly urban authorities C 10-15.99 70-89
C5 Less densely networked urban authorities C 5-9.99 70-99
C6 Less densely networked mixed rurality authorities C 5-9.99 40-69
D7 Sparsely networked mixed rurality authorities D 2-4.99 40-89
D8 Sparsely networked rural authorities D 2-4.99 20-39
D9 Sparsely networked very rural authorities D 2-4.99 0-19
E10 Very Sparsely networked mixed rurality authorities E 0-1.99 0-39
E11 Very Sparsely networked very rural Scottish Islands E 0-1.99 0-19
Z99 Not classified Z N/A N/A

Below is a table showing the HANCS Sub-Group for all 205 Highway Authorities in Great Britain. A list of authorities in each Sub-Group can be found on the HANCS Groups page.

ONS Code Highway Authority Sub-Group
S12000033 Aberdeen City C5
S12000034 Aberdeenshire E10
S12000041 Angus E10
S12000035 Argyll and Bute E10
E09000002 Barking and Dagenham London Borough B3
E09000003 Barnet London Borough B3
E08000016 Barnsley Metropolitan Borough C6
E06000022 Bath and North East Somerset D8
E06000055 Bedford Borough D8
E09000004 Bexley London Borough B3
E08000025 Birmingham City B3
E06000008 Blackburn with Darwen Borough C5
E06000009 Blackpool B2
W06000019 Blaenau Gwent County Borough C5
E08000001 Bolton Metropolitan Borough C4
E06000028 Bournemouth Borough B2
E06000036 Bracknell Forest C5
E08000032 Bradford Metropolitan Borough C5
E09000005 Brent London Borough A1
W06000013 Bridgend County Borough C6
E06000043 Brighton and Hove City B3
E06000023 Bristol City B2
E09000006 Bromley London Borough C5
E10000002 Buckinghamshire County D8
E08000002 Bury Metropolitan Borough C4
W06000018 Caerphilly County Borough C6
E08000033 Calderdale C6
E10000003 Cambridgeshire County D9
E09000007 Camden London Borough A1
W06000015 Cardiff C4
W06000010 Carmarthenshire County D9
E06000056 Central Bedfordshire D8
W06000008 Ceredigion County D9
E06000049 Cheshire East D8
E06000050 Cheshire West and Chester D8
E09000001 City of London A1
S12000005 Clackmannanshire D8
W06000003 Conwy County Borough D9
E06000052 Cornwall D9
E08000026 Coventry City B3
E09000008 Croydon London Borough B3
E10000006 Cumbria County E10
E06000005 Darlington Borough D7
W06000004 Denbighshire County D9
E06000015 Derby City B3
E10000007 Derbyshire County D8
E10000008 Devon County D9
E08000017 Doncaster D7
E10000009 Dorset County D8
E08000027 Dudley Metropolitan Borough B2
S12000006 Dumfries and Galloway E10
S12000042 Dundee City B2
E06000047 Durham County D8
E09000009 Ealing London Borough A1
S12000008 East Ayrshire E10
S12000009 East Dunbartonshire D7
S12000010 East Lothian D9
S12000011 East Renfrewshire D7
E06000011 East Riding of Yorkshire D9
E10000011 East Sussex County D8
S12000036 Edinburgh City C5
E09000010 Enfield London Borough B3
E10000012 Essex County D8
S12000014 Falkirk C6
S12000015 Fife D8
W06000005 Flintshire County D8
E08000020 Gateshead C4
S12000043 Glasgow City B2
E10000013 Gloucestershire County D8
E09000011 Greenwich London Borough A1
W06000002 Gwynedd E10
E09000012 Hackney London Borough A1
E06000006 Halton Borough C4
E09000013 Hammersmith and Fulham London Borough A1
E10000014 Hampshire County D7
E09000014 Haringey London Borough A1
E09000015 Harrow London Borough B3
E06000001 Hartlepool Borough C5
E09000016 Havering London Borough C5
E06000019 Herefordshire D9
E10000015 Hertfordshire County D7
S12000017 Highland E10
E09000017 Hillingdon London Borough B3
E09000018 Hounslow London Borough B3
S12000018 Inverclyde D7
W06000001 Isle of Anglesey County D9
E06000046 Isle of Wight D8
E09000019 Islington London Borough A1
E09000020 Kensington and Chelsea London Borough A1
E10000016 Kent County D8
E06000010 Kingston upon Hull City B2
E09000021 Kingston upon Thames London Borough B3
E08000034 Kirklees C6
E08000011 Knowsley Metropolitan Borough C4
E09000022 Lambeth London Borough A1
E10000017 Lancashire County D7
E08000035 Leeds City C5
E06000016 Leicester City B2
E10000018 Leicestershire County D8
E09000023 Lewisham London Borough A1
E10000019 Lincolnshire County D9
E08000012 Liverpool City B2
E06000032 Luton Borough B2
E08000003 Manchester City B2
E06000035 Medway C5
W06000024 Merthyr Tydfil County Borough C6
E09000024 Merton London Borough A1
E06000002 Middlesbrough B3
S12000019 Midlothian D8
E06000042 Milton Keynes C5
W06000021 Monmouthshire County D9
S12000020 Moray E10
W06000012 Neath Port Talbot County Borough D7
E08000021 Newcastle City B3
E09000025 Newham London Borough A1
W06000022 Newport City C6
E10000020 Norfolk County D9
S12000021 North Ayrshire D8
E06000012 North East Lincolnshire C5
S12000044 North Lanarkshire C6
E06000013 North Lincolnshire D9
E06000024 North Somerset D7
E08000022 North Tyneside C4
E10000023 North Yorkshire County E10
E10000021 Northamptonshire County D8
E06000048 Northumberland County E10
E06000018 Nottingham City B2
E10000024 Nottinghamshire County D8
E08000004 Oldham Metropolitan Borough C5
S12000023 Orkney Islands E11
E10000025 Oxfordshire County D8
W06000009 Pembrokeshire County D9
S12000024 Perth and Kinross E10
E06000031 Peterborough City D7
E06000026 Plymouth City B2
E06000029 Poole Borough B3
E06000044 Portsmouth City B2
W06000023 Powys County E10
E06000038 Reading Borough B3
E09000026 Redbridge London Borough B3
E06000003 Redcar & Cleveland Borough D7
S12000038 Renfrewshire C6
W06000016 Rhondda Cynon Taff County Borough D7
E09000027 Richmond upon Thames London Borough B3
E08000005 Rochdale Metropolitan Borough C5
E08000018 Rotherham Metropolitan Borough C6
E06000017 Rutland County D9
E08000006 Salford City B3
E08000028 Sandwell Metropolitan Borough B2
S12000026 Scottish Borders E10
E08000014 Sefton Metropolitan Borough C4
E08000019 Sheffield City C5
S12000027 Shetland Islands E11
E06000051 Shropshire D9
E06000039 Slough Borough B3
E08000029 Solihull Metropolitan Borough C6
E10000027 Somerset County D9
S12000028 South Ayrshire E10
E06000025 South Gloucestershire D7
S12000029 South Lanarkshire D8
E08000023 South Tyneside C4
E06000045 Southampton City B2
E06000033 Southend-on-Sea Borough B2
E09000028 Southwark London Borough A1
E08000013 St Helens Metropolitan Borough C5
E10000028 Staffordshire County D8
S12000030 Stirling E10
E08000007 Stockport Metropolitan Borough B3
E06000004 Stockton-on-Tees Borough C5
E06000021 Stoke on Trent City B3
E10000029 Suffolk County D8
E08000024 Sunderland City C4
E10000030 Surrey County C6
E09000029 Sutton London Borough B3
W06000011 Swansea City and County C6
E06000030 Swindon C6
E08000008 Tameside Metropolitan Borough B3
E06000020 Telford and Wrekin C6
E06000034 Thurrock C6
E06000027 Torbay C4
W06000020 Torfaen County Borough C6
E09000030 Tower Hamlets London Borough A1
E08000009 Trafford Metropolitan Borough B3
W06000014 Vale of Glamorgan D8
E08000036 Wakefield C6
E08000030 Walsall B3
E09000031 Waltham Forest London Borough A1
E09000032 Wandsworth London Borough A1
E06000007 Warrington Borough C5
E10000031 Warwickshire County D8
E06000037 West Berkshire D8
S12000039 West Dunbartonshire D7
S12000040 West Lothian D7
E10000032 West Sussex County D7
S12000013 Western Isles E11
E09000033 Westminster London Borough A1
E08000010 Wigan Metropolitan Borough C5
E06000054 Wiltshire D9
E06000040 Windsor and Maidenhead Royal Borough C6
E08000015 Wirral Metropolitan Borough B3
E06000041 Wokingham Borough C6
E08000031 Wolverhampton City B2
E10000034 Worcestershire County D8
W06000006 Wrexham County Borough D8
E06000014 York City D7
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