What is the Gera Road Risk Index (GRRI)?

The Gera Road Risk Index (GRRI) is a KSI-severity-weighted road-casualty rate per 1,000 licensed vehicles, computed per Great Britain local authority. Formula: (3×killed + 2×serious + 1×slight) per year ÷ licensed vehicles (thousands), averaged over 2022–2023. The result is banded 1–10 by percentile decile across all 363 local authorities. GRRI 10 = top decile (highest casualty burden relative to vehicle ownership); GRRI 1 = safest decile. Full methodology at https://gerasure.com/methodology/road-risk-index.

Which local authority has the highest road risk in Great Britain?

Based on DfT data for 2022–2023, City of London has the highest Gera Road Risk Index (GRRI 10/10). Its KSI-weighted rate is 79.52 per 1,000 licensed vehicles per year — the highest among all 363 local authorities in the dataset. Note: City of London's high score reflects a very small licensed vehicle base (c.3,100) vs high pedestrian/cyclist casualties in the dense Square Mile. Source: DfT VEH0105 + STATS19, OGL v3.0.

What is the average road risk across Great Britain local authorities?

The unweighted average KSI-weighted road-casualty rate across all 363 Great Britain local authorities is 4.772 per 1,000 licensed vehicles per year (2022–2023 average). The unweighted average total-casualties rate is 3.735 per 1,000 vehicles. These are computed from official DfT STATS19 + VEH0105 data, OGL v3.0.

Does a high GRRI mean higher car insurance premiums?

The GRRI is an area-level risk context signal derived from official road-casualty statistics — not a direct insurance premium predictor. Insurers use area-level data alongside individual factors (driver age, NCB, vehicle type, annual mileage, telematics). A high GRRI indicates that the area has historically had a higher casualty burden relative to its vehicle ownership, which is one of several factors underwriters consider when pricing motor policies.

What are KSI casualties?

KSI (Killed or Seriously Injured) is a standard DfT/DfT classification from the STATS19 reporting system. "Killed" = died within 30 days of the collision. "Seriously injured" = injuries requiring hospital in-patient admission, or (since the 2016 severity adjustment) injuries assessed by police using the CRASH injury severity guidance. The GRRI weights killed 3×, serious 2×, slight 1×, reflecting the relative severity of each outcome.

Road risk by local authority — Gera Road Risk Index

363 areas · 2022–2023 · DfT VEH0105 + STATS19 · OGL v3.0

Which local authority areas in Great Britain have the highest and lowest road risk?

Based on DfT VEH0105 and STATS19 data for 2022–2023, the highest-risk local authority in Great Britain is City of London (Gera Road Risk Index: 10/10; KSI-weighted rate 79.52 per 1,000 vehicles per year). The safest is Stockport (GRRI 1/10). The Great Britain average KSI-weighted rate is 4.772 per 1,000 licensed vehicles per year. Source: DfT, Open Government Licence v3.0.

Proprietary metric:Gera Road Risk Index (GRRI/10)·Data period: 2022–2023 · last updated 2026-06-20

These are neutral official statistics from DfT STATS19 and VEH0105. The GRRI is an area-level risk context signal — not a premium predictor. Individual insurance quotes depend on your specific vehicle, driving record, mileage, and cover type, not area risk alone. City-centre areas with low vehicle registrations but high pedestrian/cyclist activity (e.g. City of London) will score higher than their absolute casualty count suggests.

Look up the road risk index for your local authority

Select any of the 363 Great Britain local authorities to see its GRRI, KSI-weighted rate, annual casualty breakdown, and insurance context.

Select your local authority (Great Britain)

Select your local authority above to see its Gera Road Risk Index — the KSI-weighted casualty rate per 1,000 licensed vehicles, ranked across all 363 Great Britain local authorities.

10 highest-risk local authorities (2022–2023)

Ranked by KSI-weighted casualty rate per 1,000 licensed vehicles (annual average). City-centre areas with low vehicle registrations typically score highest.

Rank	Local authority	Region	GRRI	KSI-weighted / 1k veh
1	City of London	London	10/10	79.52
2	Westminster	London	10/10	24.86
3	Tower Hamlets	London	10/10	24.71
4	Lambeth	London	10/10	21.28
5	Hackney	London	10/10	21.21
6	Camden	London	10/10	20.80
7	Southwark	London	10/10	20.50
8	Islington	London	10/10	19.71
9	Kensington and Chelsea	London	10/10	19.25
10	Haringey	London	10/10	16.39

10 safest local authorities (2022–2023)

Rank	Local authority	Region	GRRI	KSI-weighted / 1k veh
#1	Stockport	Metropolitan	1/10	0.81
#2	Tamworth	England	1/10	0.95
#3	Rushmoor	England	1/10	0.97
#4	Na h-Eileanan Siar	Scotland	1/10	1.10
#5	Somerset West and Taunton	England	1/10	1.22
#6	Newcastle-under-Lyme	England	1/10	1.22
#7	Windsor and Maidenhead	England	1/10	1.24
#8	East Dunbartonshire	Scotland	1/10	1.24
#9	Moray	Scotland	1/10	1.27
#10	Aberdeen City	Scotland	1/10	1.29

Browse all 363 local authorities

City of London 10/10 Westminster 10/10 Tower Hamlets 10/10 Lambeth 10/10 Hackney 10/10 Camden 10/10 Southwark 10/10 Islington 10/10 Kensington and Chelsea 10/10 Haringey 10/10 Hammersmith and Fulham 10/10 Newham 10/10 Wandsworth 10/10 Lewisham 10/10 Brent 10/10 Greenwich 10/10 Enfield 10/10 Hounslow 10/10 Croydon 10/10 Barking and Dagenham 10/10 Ealing 10/10 Redbridge 10/10 Nottingham 10/10 Preston 10/10 Waltham Forest 10/10 Brighton and Hove 10/10 Blackpool 10/10 Birmingham 10/10 Kingston upon Hull, City of 10/10 Liverpool 10/10 Barnet 10/10 Guildford 10/10 Dartford 10/10 Runnymede 10/10 Cambridge 10/10 Blackburn with Darwen 10/10 Bradford 10/10 Rother 9/10 Chichester 9/10 Hertsmere 9/10 Epping Forest 9/10 Merton 9/10 Tandridge 9/10 East Lindsey 9/10 Crawley 9/10 Derbyshire Dales 9/10 Boston 9/10 Cotswold 9/10 Luton 9/10 North Warwickshire 9/10 Hastings 9/10 Hyndburn 9/10 Burnley 9/10 Richmond upon Thames 9/10 Havering 9/10 Fylde 9/10 Adur 9/10 Hillingdon 9/10 Swale 9/10 Canterbury 9/10 Spelthorne 9/10 Lancaster 9/10 Thanet 9/10 Ashford 9/10 Powys 9/10 Newcastle upon Tyne 9/10 Sandwell 9/10 Tunbridge Wells 9/10 Lewes 9/10 North East Lincolnshire 9/10 Kingston upon Thames 9/10 Dover 9/10 Mole Valley 9/10 Calderdale 8/10 Sevenoaks 8/10 Doncaster 8/10 Winchester 8/10 Wealden 8/10 Oxford 8/10 Sutton 8/10 St Albans 8/10 Southampton 8/10 Ceredigion 8/10 Tonbridge and Malling 8/10 Wolverhampton 8/10 Manchester 8/10 North Lincolnshire 8/10 Bromley 8/10 Lincoln 8/10 Derby 8/10 Elmbridge 8/10 Sheffield 8/10 Harrow 8/10 Rotherham 8/10 Medway 8/10 Norwich 8/10 Leeds 8/10 Reigate and Banstead 8/10 Gravesham 8/10 Kirklees 8/10 Horsham 8/10 Newark and Sherwood 8/10 West Lindsey 8/10 Folkestone and Hythe 8/10 Brentwood 8/10 West Devon 8/10 Wyre 8/10 South Cambridgeshire 8/10 Worthing 8/10 South Kesteven 7/10 South Ribble 7/10 Gateshead 7/10 Wakefield 7/10 Woking 7/10 Bexley 7/10 Chelmsford 7/10 Maidstone 7/10 Bristol, City of 7/10 North Kesteven 7/10 Surrey Heath 7/10 Eastbourne 7/10 Arun 7/10 Central Bedfordshire 7/10 Tewkesbury 7/10 Portsmouth 7/10 Epsom and Ewell 7/10 Bolsover 7/10 Chorley 7/10 Great Yarmouth 7/10 Bassetlaw 7/10 Pembrokeshire 7/10 Barnsley 7/10 Reading 7/10 Middlesbrough 7/10 Knowsley 7/10 Walsall 7/10 West Lancashire 7/10 East Riding of Yorkshire 7/10 Mid Sussex 7/10 Waverley 7/10 Pendle 7/10 King's Lynn and West Norfolk 7/10 East Cambridgeshire 7/10 Welwyn Hatfield 7/10 Cornwall 7/10 Bedford 6/10 Isle of Wight 6/10 Southend-on-Sea 6/10 Colchester 6/10 Glasgow City 6/10 Northumberland 6/10 West Northamptonshire 6/10 High Peak 6/10 Argyll and Bute 6/10 North Norfolk 6/10 York 6/10 Uttlesford 6/10 Thurrock 6/10 Tendring 6/10 Rugby 6/10 North Devon 6/10 Gloucester 6/10 Babergh 6/10 Bournemouth, Christchurch and Poole 6/10 Forest of Dean 6/10 Huntingdonshire 6/10 Ribble Valley 6/10 Ashfield 6/10 Hartlepool 6/10 Sefton 6/10 Dorset 6/10 South Holland 6/10 South Norfolk 6/10 Watford 6/10 North East Derbyshire 6/10 Broxbourne 6/10 Carmarthenshire 6/10 Plymouth 6/10 East Hampshire 6/10 Torridge 6/10 South Derbyshire 6/10 Ipswich 6/10 Rossendale 5/10 Maldon 5/10 Basingstoke and Deane 5/10 Sunderland 5/10 Mansfield 5/10 Three Rivers 5/10 Stevenage 5/10 Dudley 5/10 Braintree 5/10 Salford 5/10 Coventry 5/10 Broadland 5/10 City of Edinburgh 5/10 Gwynedd 5/10 Denbighshire 5/10 Test Valley 5/10 New Forest 5/10 Highland 5/10 Malvern Hills 5/10 Bromsgrove 5/10 Leicester 5/10 Stratford-on-Avon 5/10 Torbay 5/10 Bolton 5/10 Breckland 5/10 Erewash 5/10 Hart 5/10 Fareham 5/10 Herefordshire, County of 5/10 Dundee City 5/10 Fenland 5/10 Wiltshire 5/10 Isles of Scilly 5/10 Stockton-on-Tees 5/10 Cheshire East 5/10 St. Helens 5/10 East Hertfordshire 4/10 Cheshire West and Chester 4/10 North Hertfordshire 4/10 Broxtowe 4/10 Rushcliffe 4/10 Warrington 4/10 North Northamptonshire 4/10 West Suffolk 4/10 North Tyneside 4/10 Wirral 4/10 Dumfries and Galloway 4/10 Amber Valley 4/10 Perth and Kinross 4/10 Dacorum 4/10 Havant 4/10 East Devon 4/10 South Hams 4/10 East Ayrshire 4/10 Rochdale 4/10 Eastleigh 4/10 East Suffolk 4/10 Gosport 4/10 Oldham 4/10 Warwick 4/10 Cheltenham 4/10 Newport 4/10 Melton 4/10 Conwy 4/10 Shropshire 4/10 County Durham 4/10 Nuneaton and Bedworth 4/10 Stroud 4/10 South Tyneside 4/10 West Oxfordshire 4/10 Tameside 4/10 Harlow 4/10 Midlothian 3/10 Redcar and Cleveland 3/10 Gedling 3/10 Halton 3/10 Scottish Borders 3/10 Teignbridge 3/10 South Staffordshire 3/10 Peterborough 3/10 Mid Suffolk 3/10 Wychavon 3/10 West Lothian 3/10 Vale of White Horse 3/10 East Lothian 3/10 Buckinghamshire 3/10 Basildon 3/10 Angus 3/10 Wyre Forest 3/10 Flintshire 3/10 Cherwell 3/10 Mid Devon 3/10 Telford and Wrekin 3/10 Solihull 3/10 West Berkshire 3/10 Harborough 3/10 Wrexham 3/10 Exeter 3/10 North Ayrshire 3/10 North Somerset 3/10 South Lanarkshire 3/10 Rochford 3/10 Cardiff 3/10 Caerphilly 3/10 South Oxfordshire 3/10 Eden 3/10 Bury 3/10 Fife 3/10 Trafford 2/10 Castle Point 2/10 North Lanarkshire 2/10 Rhondda Cynon Taf 2/10 Blaby 2/10 South Lakeland 2/10 Allerdale 2/10 Stirling 2/10 Torfaen 2/10 Wokingham 2/10 North West Leicestershire 2/10 Monmouthshire 2/10 Hinckley and Bosworth 2/10 Ryedale 2/10 Blaenau Gwent 2/10 South Ayrshire 2/10 Carlisle 2/10 Rutland 2/10 Copeland 2/10 Richmondshire 2/10 Worcester 2/10 Merthyr Tydfil 2/10 East Renfrewshire 2/10 Falkirk 2/10 Aberdeenshire 2/10 Inverclyde 2/10 Hambleton 2/10 Lichfield 2/10 Sedgemoor 2/10 Wigan 2/10 Stafford 2/10 Chesterfield 2/10 Bath and North East Somerset 2/10 Charnwood 2/10 Scarborough 2/10 Swindon 2/10 Oadby and Wigston 1/10 Vale of Glamorgan 1/10 Staffordshire Moorlands 1/10 Bracknell Forest 1/10 East Staffordshire 1/10 West Dunbartonshire 1/10 Clackmannanshire 1/10 Stoke-on-Trent 1/10 Redditch 1/10 Craven 1/10 South Gloucestershire 1/10 Cannock Chase 1/10 Isle of Anglesey 1/10 Darlington 1/10 Neath Port Talbot 1/10 Mendip 1/10 Orkney Islands 1/10 Bridgend 1/10 Shetland Islands 1/10 Renfrewshire 1/10 Barrow-in-Furness 1/10 Harrogate 1/10 Milton Keynes 1/10 Swansea 1/10 Slough 1/10 Selby 1/10 South Somerset 1/10 Aberdeen City 1/10 Moray 1/10 East Dunbartonshire 1/10 Windsor and Maidenhead 1/10 Newcastle-under-Lyme 1/10 Somerset West and Taunton 1/10 Na h-Eileanan Siar 1/10 Rushmoor 1/10 Tamworth 1/10 Stockport 1/10

Frequently asked questions

What is the Gera Road Risk Index (GRRI)?: The Gera Road Risk Index (GRRI) is a KSI-severity-weighted road-casualty rate per 1,000 licensed vehicles, computed per Great Britain local authority. Formula: (3×killed + 2×serious + 1×slight) per year ÷ licensed vehicles (thousands), averaged over 2022–2023. The result is banded 1–10 by percentile decile across all 363 local authorities. GRRI 10 = top decile (highest casualty burden relative to vehicle ownership); GRRI 1 = safest decile. Full methodology at https://gerasure.com/methodology/road-risk-index.
Which local authority has the highest road risk in Great Britain?: Based on DfT data for 2022–2023, City of London has the highest Gera Road Risk Index (GRRI 10/10). Its KSI-weighted rate is 79.52 per 1,000 licensed vehicles per year — the highest among all 363 local authorities in the dataset. Note: City of London's high score reflects a very small licensed vehicle base (c.3,100) vs high pedestrian/cyclist casualties in the dense Square Mile. Source: DfT VEH0105 + STATS19, OGL v3.0.
What is the average road risk across Great Britain local authorities?: The unweighted average KSI-weighted road-casualty rate across all 363 Great Britain local authorities is 4.772 per 1,000 licensed vehicles per year (2022–2023 average). The unweighted average total-casualties rate is 3.735 per 1,000 vehicles. These are computed from official DfT STATS19 + VEH0105 data, OGL v3.0.
Does a high GRRI mean higher car insurance premiums?: The GRRI is an area-level risk context signal derived from official road-casualty statistics — not a direct insurance premium predictor. Insurers use area-level data alongside individual factors (driver age, NCB, vehicle type, annual mileage, telematics). A high GRRI indicates that the area has historically had a higher casualty burden relative to its vehicle ownership, which is one of several factors underwriters consider when pricing motor policies.
What are KSI casualties?: KSI (Killed or Seriously Injured) is a standard DfT/DfT classification from the STATS19 reporting system. "Killed" = died within 30 days of the collision. "Seriously injured" = injuries requiring hospital in-patient admission, or (since the 2016 severity adjustment) injuries assessed by police using the CRASH injury severity guidance. The GRRI weights killed 3×, serious 2×, slight 1×, reflecting the relative severity of each outcome.

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Data period: 2022–2023 (vehicles: Q4 2023; casualties: 2022–2023 average). Sources: DfT VEH0105 vehicle licensing statistics + DfT STATS19 road casualty statistics. Contains public sector information licensed under the Open Government Licence v3.0. GRRI methodology: https://gerasure.com/methodology/road-risk-index.