Corunna Drive Horsham
12 addresses across 2 postcodes (RH13), about 140 m long, classed as a local road. USRN 17601237.
- Sales: 13 recorded sales since 1995; in 2025 the median was £835,000 across 1 sale.
- Prices and rents: A typical home in Horsham cost £441,491 in August 2026 (-0.5% on a year); private rents averaged £1,490 a month.
- Energy: 3 homes have an energy certificate (C: 1, D: 2).
- Flood: 5 addresses on its postcodes are in areas at high or medium risk of flooding from rivers, the sea or surface water.
- Recorded floods: No recorded flood covers the centre of any of its postcodes.
- Energy projects: 1 renewable energy project nearby is planned or being built; the nearest, Britania Crest Recycling Limited - 3RS EfW Facilty, is 3.7 km (2.3 miles) away.
- Council tax: Most homes around it are in council tax band D; Band D in Horsham costs £2,441 a year in 2026-27.
- Broadband: Gigabit broadband is available to 100% of premises.
- Transport: The nearest railway station is Horsham, about 710 m (0.4 miles) away in a straight line.
- Green space: The nearest park or garden is about 790 m (0.5 miles) away.
- Air: Background air pollution in 2024 was 7.2 µg/m³ of nitrogen dioxide and 6.7 of PM2.5, within UK legal limits.
- Height: Its addresses are 67 to 68 m above sea level.
- Noise: 1 of its 12 addresses is modelled at 55 dB or more from road traffic.
- Doctors: The nearest GP surgery is Park Surgery, about 1.3 km (0.8 miles) away, with 2 practices within 1.6 km (1 mile).
- People: About 640 people lived in the census areas around it in 2021; 92% of households owned their home and 44% of adults held a degree or other higher qualification.
- Crime: 28 crimes were recorded within 250 m between September 2025 and August 2026, most often violence and sexual offences.
- Road safety: No collisions in which someone was hurt were reported on and around it in 2021 to 2025.
£9.99 The Street Dossier Full Report for a home on Corunna Drive: its own records, questions to ask the seller and everything on this page, in one PDF. Choose the home
House sales on this street
| Year | Sales | Median price | Lowest | Highest |
|---|---|---|---|---|
| 2025 | 1 | £835,000 | £835,000 | £835,000 |
| 2023 | 1 | £805,000 | £805,000 | £805,000 |
| 2021 | 1 | £525,000 | £525,000 | £525,000 |
| 2014 | 1 | £560,000 | £560,000 | £560,000 |
| 2009 | 1 | £182,500 | £182,500 | £182,500 |
| 2007 | 2 | £449,500 | £425,000 | £474,000 |
| 2004 | 1 | £435,000 | £435,000 | £435,000 |
| 2003 | 1 | £362,500 | £362,500 | £362,500 |
| 2001 | 1 | £249,950 | £249,950 | £249,950 |
| 1998 | 2 | £178,750 | £165,000 | £192,500 |
| 1997 | 1 | £152,250 | £152,250 | £152,250 |
| Date | Address | Type | Price | Notes |
|---|---|---|---|---|
| 26 Feb 2021 | 2 RH13 5HG | Detached | £525,000 | |
| 28 Sep 2007 | 3 RH13 5HG | Detached | £474,000 | |
| 30 Oct 1998 | 3 RH13 5HG | Detached | £192,500 | |
| 21 Mar 2025 | 4 RH13 5HG | Detached | £835,000 | |
| 17 Apr 2014 | 4 RH13 5HG | Detached | £560,000 | |
| 15 Jun 2007 | 4 RH13 5HG | Detached | £425,000 | |
| 27 Aug 2009 | 5 RH13 5HG | Detached | £182,500 | |
| 3 Oct 2003 | 6 RH13 5HG | Detached | £362,500 | |
| 27 Jan 1997 | 6 RH13 5HG | Detached | £152,250 | |
| 27 Sep 2023 | 8 RH13 5HG | Detached | £805,000 | |
| 6 Jul 2004 | 8 RH13 5HG | Detached | £435,000 | |
| 6 May 1998 | 10 RH13 5HG | Detached | £165,000 | |
| 16 Aug 2001 | ST MARKS HOUSE RH13 5HG | Detached | £249,950 |
House prices and rents in Horsham
A typical home in Horsham cost £441,491 in August 2026, 0.5% less than a year before. That is 13% more than five years earlier and 18% more than ten years earlier.
| Home | Typical price, Aug 2026 |
|---|---|
| Detached | £763,686 |
| Semi-detached | £462,399 |
| Terraced | £372,425 |
| Flat or maisonette | £216,988 |
| Bought by a first-time buyer | £324,417 |
Private renters in Horsham paid £1,490 a month on average in September 2026, 4.8% more than a year before. That is 35% more than five years earlier.
| Home | Average rent a month, Sep 2026 |
|---|---|
| One bedroom | £1,033 |
| Two bedrooms | £1,366 |
| Three bedrooms | £1,718 |
| Four or more bedrooms | £2,454 |
Energy performance certificates
3 homes with a current certificate; median floor area 135 m². Most common: House, detached (3). Built: 1967-1975 (2); 1950-1966 (1). Tenure at assessment: owner-occupied (2); rented (private) (1).
Each home's certificates and sales (3 addresses)
Gas and electricity use
Homes with gas used 16,813 kWh of it on average in 2024, 46% more than the district's 11,510 kWh, and 3,437 kWh of electricity, 24% less than the district's 4,537 kWh. There are gas meters for about 92% of the homes.
| Postcode | Electricity meters | Typical electricity | Gas meters | Typical gas |
|---|---|---|---|---|
| RH13 5HG | 9 | 3,079 kWh | 9 | 18,965 kWh |
| RH13 5HQ | 30 6 Economy 7 | 3,257 kWh | 27 | 15,087 kWh |
These are all the homes on each postcode, whatever their size and however many live in them, so they show the kind of homes and heating here rather than what any one home uses. The typical figure is the median: half the homes used less. The district is RH13.
Council tax
What each band costs in Horsham in 2026-27: Band D £2,441 a year on average, including the police, fire and any county and parish charges.
| A | B | C | D | E | F | G | H |
|---|---|---|---|---|---|---|---|
| £1,627 | £1,899 | £2,170 | £2,441 | £2,983 | £3,526 | £4,068 | £4,882 |
Homes by band in the neighbourhood around this street: most are in band D (30% of about 710 homes).
Planning and heritage
- Conservation area: no postcode centre in this street's postcodes is in one.
- Listed buildings on or by this street: none.
- Article 4 direction (removing permitted development rights): none recorded, though not every council has published theirs.
- Tree preservation orders: none recorded, though not every council has published theirs.
- Green belt: no.
Brownfield land registered for housing within 1 km (0.6 miles)
- 9-13 Crawley Road Horsham (North Horsham): up to 15 homes, not permissioned (810 m (0.5 miles))
- Star Reservoir Comptons Brow Lane Horsham (North Horsham): up to 32 homes, not permissioned (850 m (0.5 miles))
- Scout HQ site, Peary Close, Horsham (North Horsham), permissioned (910 m (0.6 miles))
Energy projects nearby
4 energy projects near the street's postcodes, 1 of them not yet operating.
| Project | Kind | Size | Stage | Distance |
|---|---|---|---|---|
| Britania Crest Recycling Limited - 3RS EfW Facilty Horsham WSCC/015/18/NH | Energy from waste (incinerator) | 21 MW | Permission granted, not yet built Feb 2020 | 3.7 km (2.3 miles) |
| Broockhurst Wood | Landfill Gas | 2 MW | Operational Dec 2000 | 4 km (2.5 miles) |
| Brookhurst Wood Gas to Energy | Landfill Gas | 5.1 MW | Operational Nov 2000 | 4.2 km (2.6 miles) |
| Brookhurst Wood (Waste AD) Horsham WSCC/055/09/NH | Anaerobic digestion | 4.5 MW | Operational Jul 2015 | 4.3 km (2.7 miles) |
Planned projects can change or not go ahead; search the planning authority's applications by the reference shown for the plans, conditions and any objections. Construction brings traffic for some months; once built, solar farms and batteries are usually quiet, while turbines and waste plants can be seen or heard further away.
Roadworks
Finished in the last three months
- 30 October 2026: CITYFIBRE METRO NETWORKS LTD, Utility repair and maintenance works, no carriageway incursion, on the footway (immediate - urgent works)
Flood risk
Rivers, the sea or surface water: in this street's postcodes, 5 addresses are in areas at high risk, 0 at medium risk and 1 at low risk. Each address counts once, at the higher of its rivers-and-sea and surface-water risk.
Rivers and the sea alone: no home is in an area at risk.
High: 3.3% (1 in 30) or more chance of flooding a year. Medium: 1% to 3.3%. Low: 0.1% to 1%. Very low: under 0.1%. The rivers and sea figures allow for flood defences. Counts cover whole postcodes, which can include other streets.
Flood zone for planning: no postcode centre on this street is in flood zone 2 or 3.
| Postcode | Planning zone | Addresses at high / medium / low risk | Groundwater |
|---|---|---|---|
| RH13 5HG | not in 2 or 3 | 0 / 0 / 0 | unlikely |
| RH13 5HQ | not in 2 or 3 | 5 / 0 / 1 | unlikely |
Recorded floods
No recorded flood covers the centre of any of this street's postcodes.
Recorded floods are where floodwater was seen or surveyed after a flood. Many floods were never mapped, an outline over a postcode's centre does not mean every home in it flooded, and homes outside one may have. Ask the seller whether the home itself has flooded.
Coastal erosion
No projected coastal erosion zone is within 1 km (0.6 miles) of the street's postcodes.
Storm overflows
No storm overflow outlet is within 1 km (0.6 miles) of the street's postcodes.
Coal mining
No postcode centre on the street is in a coalfield: the Mining Remediation Authority records no coal mining risk here.
Radon
Every 1 km square the street's postcodes are in is in the lowest band of radon potential: fewer than 1 home in 100 is estimated to be at or above the Action Level. It is not a radon Affected Area.
Historic landfill
No historic landfill site is within 500 m (0.3 miles) of the street's postcodes.
Height above sea level
The street's 12 addresses are between 67 m and 68 m above sea level (67 m on average).
Broadband
| Postcode | Superfast (30 Mbit/s+) | Ultrafast (300 Mbit/s+) | Gigabit | Below 10 Mbit/s |
|---|---|---|---|---|
| RH13 5HG | 100% | 100% | 100% | 0% |
| RH13 5HQ | 100% | 100% | 100% | 0% |
Getting around
| Nearest | Distance | |
|---|---|---|
| Railway stations | Horsham 2.5 million journeys in 2024–25 | 710 m (0.4 miles) |
| Littlehaven 281,000 journeys in 2024–25 | 1.6 km (1 mile) | |
| Warnham 9,710 journeys in 2024–25 | 3.4 km (2.1 miles) | |
| Bus stops | 7 stops within 400 m (0.2 miles), 24 within 800 m (0.5 miles); nearest Corunna Drive Oakhill | 60 m |
| Bus or coach station | Littlehaven - Lambs Farm Road | 1.4 km (0.9 miles) |
| Car parks | 1 within 800 m (0.5 miles); nearest Apcoa | 530 m (0.3 miles) |
| EV charging points | 14 within 1.6 km (1 mile); nearest bp pulse Charging Station | 360 m |
| Airport with scheduled flights | London Gatwick Airport LGW | 12.7 km (7.9 miles) |
Local services
| Nearest | Distance | |
|---|---|---|
| GP surgeries | 2 practices within 1.6 km (1 mile); nearest Park Surgery Requires improvement Sep 2022 | 1.3 km (0.8 miles) |
| Pharmacies | 5 pharmacies within 1.6 km (1 mile); nearest Nories Pharmacy | 510 m (0.3 miles) |
| NHS dentists | 7 practices within 1.6 km (1 mile); nearest Allround Dental | 1.1 km (0.7 miles) |
| Hospital | Horsham Hospital | 1.1 km (0.7 miles) |
| Care homes | 11 homes within 1.6 km (1 mile); nearest Oakhill House Care Home Requires improvement Aug 2022 | 390 m |
| Police station | Horsham Police Station | 1 km (0.6 miles) |
| Cash machines | ATM | 1 km (0.6 miles) |
Parks and green space
| Nearest | Distance | |
|---|---|---|
| Park or garden | 1 within 800 m (0.5 miles); nearest Unnamed 9,220 m² | 790 m (0.5 miles) |
| Play area | 2 within 800 m (0.5 miles); nearest Unnamed 150 m² | 430 m (0.3 miles) |
| Playing field | Bennett's Field 3.0 ha | 830 m (0.5 miles) |
| Allotments | 2 within 800 m (0.5 miles); nearest Depot Road Allotments 1.7 ha | 110 m |
Within 800 m (0.5 miles): 1 park or garden, 0.9 hectares in all.
Landmarks
The nearest historic landmark is North Chapel, a listed building (Grade II*), 800 m (0.5 miles) west. 19 listed buildings are within 1 km (0.6 miles), 2 of them Grade II*.
| Name | What it is | From the middle of the street |
|---|---|---|
| North Chapel | Listed building, Grade II* | 800 m (0.5 miles) west |
| Horsham Park | Listed building, Grade II* | 1 km (0.6 miles) west |
| Moated site and fishponds 15m south of Chesworth House | Scheduled monument | 1.8 km (1.1 miles) south-west |
| Name | What it is | From the middle of the street |
|---|---|---|
| Kingslea Pond | Lake or reservoir | 270 m north-west |
| Townhouse Copse | Wood | 910 m (0.6 miles) east |
| Leechpool Wood | Wood | 1 km (0.6 miles) north-east |
| Sandpit Clump | Wood | 1.2 km (0.7 miles) east |
| The Glen | Valley | 1.4 km (0.9 miles) south-east |
| Tower Hill | Hill | 2.6 km (1.6 miles) south-west |
Air quality
| Pollutant | Here | UK limit | WHO guideline |
|---|---|---|---|
| Nitrogen dioxide (NO2) | 7.2 | 40 | 10 |
| Fine particles (PM2.5) | 6.7 | 20 | 5 |
| Particles (PM10) | 10.2 | 40 | 15 |
All three are within the UK legal limits; PM2.5 is above the WHO guideline, as in most towns and cities.
Road and rail noise
| Level | Road traffic | Railways |
|---|---|---|
| 55 to 59 | 1 | 0 |
| Under 55 | 11 | 12 |
1 of the street's 12 addresses is modelled at 55 dB or more from road traffic, above the WHO guidelines.
Climate, daylight and earthquakes
Monthly temperatures and rainfall, sunrise and sunset through the year, and earthquakes recorded nearby since 1970 are much the same across the area, so they are worked out once for Horsham: see them on the Horsham page.
Nearest schools
| School | Phase | Ages | Distance | Inspection | Exam results |
|---|---|---|---|---|---|
| Millais School | Secondary | 11–16 | 230 m | Good (Sep 2022, overall grade under the previous framework) | GCSE 2026 (provisional): Attainment 8 54.7 (51.6 in 2025 and 52.9 in 2024); 64% grade 5+ in English and maths |
| Horsham Nursery School | Nursery | 3–5 | 350 m | No published inspection | |
| Kingslea Primary School | Primary | 4–11 | 390 m | Report card (May 2026): Curriculum and teaching: Strong standard; Achievement: Strong standard; Attendance and behaviour: Strong standard; Personal development and wellbeing: Strong standard; Inclusion: Strong standard; Leadership and governance: Strong standard; Early years: Strong standard; Safeguarding standards: Met | 79% at the expected standard in reading, writing and maths, 11% at the higher standard (2025; 83% in 2024 and 74% in 2023) |
| The Forest School | Secondary | 11–16 | 680 m (0.4 miles) | No published inspection | GCSE 2026 (provisional): Attainment 8 43.1; 41.8% grade 5+ in English and maths |
| Heron Way Primary School | Primary | 4–11 | 1 km (0.6 miles) | Outstanding (Feb 2024, overall grade under the previous framework) | 95% at the expected standard in reading, writing and maths, 17% at the higher standard (2025; 86% in 2024 and 96% in 2023) |
| Leechpool Primary School | Primary | 4–11 | 1.1 km (0.7 miles) | Requires improvement (Jun 2024, overall grade under the previous framework) | 73% at the expected standard in reading, writing and maths, 8% at the higher standard (2025; 47% in 2024 and 63% in 2023) |
| The College of Richard Collyer In Horsham | 16 plus | 16–19 | 1.2 km (0.8 miles) | No published inspection | None published |
| Oakfields Primary School, Horsham | Primary | 4–11 | 1.2 km (0.8 miles) | Good (Jun 2024, overall grade under the previous framework) | 31% at the expected standard in reading, writing and maths, 5% at the higher standard (2025; 54% in 2024 and 45% in 2023) |
| North Heath Community Primary School | Primary | 4–11 | 1.6 km (1 mile) | No published inspection | 68% at the expected standard in reading, writing and maths, 9% at the higher standard (2025; 71% in 2024 and 68% in 2023) |
| St Mary's CofE (Aided) Primary School Church of England | Primary | 4–11 | 1.6 km (1 mile) | No published inspection | 67% at the expected standard in reading, writing and maths, 3% at the higher standard (2025; 67% in 2024 and 61% in 2023) |
| Trafalgar Community Infant School | Primary | 4–7 | 1.8 km (1.1 miles) | No published inspection | None published |
| St Robert Southwell Catholic Primary School, Horsham Roman Catholic | Primary | 4–11 | 1.9 km (1.2 miles) | Good (Mar 2023, overall grade under the previous framework) | 83% at the expected standard in reading, writing and maths, 7% at the higher standard (2025; 76% in 2024 and 66% in 2023) |
Exam results are from the Department for Education's school performance tables (Explore Education Statistics, Open Government Licence), for all pupils at each school. The middle school in England had 63% at the expected standard at the end of primary school (2025), Attainment 8 of 46.0 at GCSE (2026) and an A level average of C+ (2025). Attainment 8 adds up a pupil's grades in eight GCSEs, with English and maths counted twice (90 is the most), averaged over the school's pupils. Progress 8 compares pupils with others who had the same results at the end of primary school; it is not published for GCSEs in 2025 and 2026, as those pupils sat no primary tests during the pandemic. Small year groups swing from year to year, and figures for very small ones are withheld.
Nurseries and childcare
The ten nearest nurseries, pre-schools and clubs are all within 1 km (0.6 miles); the nearest is 220 m from the middle of the street.
| Provider | Kind | Places | Latest inspection | Distance |
|---|---|---|---|---|
| Barracudas Horsham Millais RH13 5HR | Out-of-school day care | 128 | Not inspected yet | 220 m |
| Horsham Nursery School Under 3's RH13 5UT | Full day care | 42 | Good (Dec 2023, overall grade under the previous framework) | 340 m |
| Rocketeers RH13 5PS | Out-of-school day care | 70 | Not inspected yet | 390 m |
| Yippee Club Horsham RH13 5NW | Sessional day care (over fives) | Not inspected yet | 650 m (0.4 miles) | |
| Kids' All Star Sports RH13 5NT | Out-of-school day care (over fives) | Not inspected yet | 740 m (0.5 miles) | |
| Horsham Montessori RH13 5JZ | Full day care | 40 | Good (Mar 2023, overall grade under the previous framework) | 800 m (0.5 miles) |
| Grasshoppers RH12 2EP | Out-of-school day care (over fives) | Not inspected yet | 890 m (0.6 miles) | |
| Monkey Puzzle Day Nursery RH13 6SQ | Full day care | 100 | Jun 2026: Expected standard in 3 areas, Needs attention in 3 | 910 m (0.6 miles) |
| Keeley's Daycare Nurseries & Pre-Schools RH12 1DB | Full day care | 100 | Good (Sep 2024, overall grade under the previous framework) | 1 km (0.6 miles) |
| Rocketeers RH13 6DJ | Out-of-school day care | 30 | Not inspected yet | 1 km (0.6 miles) |
Ofsted also registers 388 childminders and 67 home childcarers (nannies) in West Sussex. It does not publish their addresses, so they cannot be shown here; the council's family information service lists those taking children.
Food hygiene ratings nearby
| Business | Type | Distance | Rating | Rated |
|---|---|---|---|---|
| The Horsham Brewery Company Limited RH13 5RG | Manufacturers/packers | 240 m | 5 Very good | 23 Jan 2025 |
| Bliksem Biltong RH13 5RG | Manufacturers/packers | 290 m | 5 Very good | 6 Mar 2025 |
| Horsham Brewery Company RH13 5RG | Manufacturers/packers | 300 m | Awaiting inspection | |
| The Cocktail Connoisseurs Ltd RH13 5RG | Manufacturers/packers | 300 m | 5 Very good | 9 Jan 2025 |
| Simply Topp's Ltd (T/A Simply Cake Craft) RH13 5RG | Retailers - other | 310 m | 5 Very good | 19 Feb 2020 |
| Halopenos RH13 5RG | Farmers/growers | 320 m | Awaiting inspection | |
| Strawford Centre RH13 5RG | Restaurant/Cafe/Canteen | 320 m | 5 Very good | 20 Nov 2024 |
| Bangers Galore RH13 5RG | Manufacturers/packers | 330 m | 5 Very good | 19 Oct 2022 |
Crime within 250 m
| Category | Crimes |
|---|---|
| Violence and sexual offences | 19 |
| Anti-social behaviour | 3 |
| Other crime | 2 |
| Public order | 2 |
| Drugs | 1 |
| Burglary | 1 |
Most of these are attached to: On or near Nightingales Close (14); On or near Owers Close (6); On or near Waterfield Close (3); On or near Stirling Way (1); On or near Depot Road (1).
Road safety
No collisions in which someone was hurt were reported on and around the street in 2021 to 2025.
Only collisions in which someone was hurt and which the police were told about are here: damage-only collisions and near misses are not, and some injuries are never reported. Positions are recorded by the police, usually to within a few metres. Each year's figures are published the following September.
Traffic on nearby roads
No traffic count point is within 500 m (0.3 miles) of the street's postcodes. The Department for Transport counts every motorway and A road and only a sample of minor roads, so a quiet residential street usually has none.
People and work
Who lives here
| Around this street | England | |
|---|---|---|
| Median age | 48 | 40 |
| Children under 15 | 17% | 17% |
| Aged 65 and over | 25% | 18% |
Homes
| Around this street | England | |
|---|---|---|
| Owned (outright or with a mortgage) | 92% | 61% |
| Owned outright | 53% | 33% |
| Shared ownership | 0% | 1% |
| Social rented | 5% | 17% |
| Private rented | 3% | 21% |
Work and commuting
| Around this street | England | |
|---|---|---|
| Adults (16 and over) in work | 56% | 57% |
| Unemployment (of those working or looking for work) | 4% | 6% |
| Retired (of adults) | 29% | 22% |
| Long-term sick or disabled (of adults) | 2% | 4% |
| Work mainly from home (of those in work) | 55% | 32% |
| Travel to work by car or van | 35% | 48% |
| By train, Underground, metro or tram | 4% | 4% |
| By any public transport, including bus | 4% | 8% |
| On foot or by bicycle | 6% | 10% |
| Work within 10 km (6 miles) of home (of those who travel to work) | 53% | 65% |
| Work 30 km (19 miles) or more away | 14% | 8% |
Education and languages
| Around this street | England | |
|---|---|---|
| Degree or other higher qualification, Level 4+ (of adults) | 44% | 34% |
| No qualifications | 10% | 18% |
| Apprenticeship as highest qualification | 4% | 5% |
| Main language English (aged 3 and over) | 97% | 91% |
| Cannot speak English well or at all | under 1% | 2% |
Deprivation
The neighbourhood around this street is in decile 10 of 10 on the English Indices of Deprivation 2025, where 1 is the most deprived tenth of England's 33,755 neighbourhoods and 10 the least.
What has changed
- Roadworks Street works permit: CITYFIBRE METRO NETWORKS LTD: Utility repair and maintenance works, 30 October 2026 (no carriageway incursion) found 3 November 2026
Postcodes on this street
Nearby streets
Lanark Close · Woodgates Close · Orchard Road · Pollards Drive · Leonard Way · Waterfield Close · Patchings · Stirling Way · Owers Close · Nightingales Close · Elgin Close · Blatchford Road
What this page cannot tell you
- Whether a particular house is at risk of flooding, subsiding or anything else: the flood map is a model of areas and there is no property-level data here.
- What a home is worth now: sales are historic prices for the homes that happened to sell.
- How safe the street is: crime points are moved to anonymised locations and many crimes are never reported; road collisions count only those in which someone was hurt and the police were told.
- Whether you would get a place at a school: distances are straight lines, not catchments.
- Who lives on the street now: census figures describe the small areas around it in March 2021, during a lockdown.
- How long a journey takes or how often anything runs: transport distances are straight lines to the nearest stops.
- Whether a GP practice is taking new patients, or a dentist new NHS patients.
- How loud a home is inside, or noise from industry, neighbours or smaller airfields: noise figures are models of road, rail and air traffic outside.
How each figure on this page is matched to the street and worked out: methodology.