St Nicholas Close Waunarlwydd, Swansea
24 addresses across 2 postcodes (SA5), about 150 m long, classed as a local road. USRN 39102268.
- Sales: 36 recorded sales since 1995; in 2026 the median was £210,000 across 1 sale.
- Prices and rents: A typical home in Swansea cost £211,177 in August 2026 (+1.8% on a year); private rents averaged £853 a month.
- Energy: 13 homes have an energy certificate (C: 9, D: 3, E: 1).
- Flood: No postcode centre on the street is in flood zone 2 or 3.
- Recorded floods: No recorded flood covers the centre of any of its postcodes.
- Coal mining: It is in a coalfield, in a low risk area.
- Radon: Up to 5 to 10% of homes in the 1 km squares around it are estimated to be at or above the radon Action Level.
- Energy projects: 2 renewable energy projects nearby are planned or being built; the nearest, Parc Solar Caenewydd, is 1.9 km (1.2 miles) away.
- Traffic: The busiest counted road within 500 m (0.3 miles), the B4295, carries 9,916 motor vehicles a day on average (2025).
- Council tax: Most homes around it are in council tax band C; Band D in Swansea costs £2,238 a year in 2026-27.
- Broadband: Gigabit broadband is available to 100% of premises.
- Transport: The nearest railway station is Gowerton, about 1.5 km (0.9 miles) away in a straight line.
- Green space: The nearest park or garden is about 140 m away.
- Air: Background air pollution in 2024 was 7.7 µg/m³ of nitrogen dioxide and 5.0 of PM2.5, within UK legal limits.
- Height: Its addresses are 49 to 58 m above sea level.
- Noise: 7 of its 24 addresses are modelled at 55 dB or more from road traffic.
- Doctors: The nearest GP surgery is Estuary Group Practice, about 1.8 km (1.1 miles) away.
- People: About 290 people lived in the census areas around it in 2021; 80% of households owned their home and 35% of adults held a degree or other higher qualification.
- Crime: 25 crimes were recorded within 250 m between September 2025 and August 2026, most often anti-social behaviour.
- 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 St Nicholas Close: 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 |
|---|---|---|---|---|
| 2026 | 1 | £210,000 | £210,000 | £210,000 |
| 2023 | 1 | £165,000 | £165,000 | £165,000 |
| 2022 | 2 | £143,000 | £99,000 | £187,000 |
| 2021 | 1 | £155,000 | £155,000 | £155,000 |
| 2020 | 1 | £120,000 | £120,000 | £120,000 |
| 2018 | 1 | £113,500 | £113,500 | £113,500 |
| 2017 | 2 | £131,000 | £117,000 | £145,000 |
| 2015 | 1 | £133,000 | £133,000 | £133,000 |
| 2014 | 1 | £93,500 | £93,500 | £93,500 |
| 2013 | 1 | £102,500 | £102,500 | £102,500 |
| 2012 | 1 | £110,000 | £110,000 | £110,000 |
| 2011 | 1 | £94,500 | £94,500 | £94,500 |
| Date | Address | Type | Price | Notes |
|---|---|---|---|---|
| 11 Oct 2002 | 1 SA5 4QB | Semi-detached | £82,000 | Leasehold. |
| 22 Mar 2002 | 2 SA5 4QB | Semi-detached | £47,000 | Leasehold. |
| 12 Sep 1995 | 2 SA5 4QB | Semi-detached | £39,995 | Leasehold. |
| 26 May 1995 | 2 SA5 4QB | Semi-detached | £40,500 | Leasehold. |
| 17 May 2023 | 3 SA5 4QB | Semi-detached | £165,000 | |
| 24 Mar 2022 | 3 SA5 4QB | Semi-detached | £99,000 | Leasehold. |
| 31 Jan 2022 | 3 SA5 4QB | Semi-detached | £90,000 | Leasehold. Not a standard sale (repossession, buy-to-let or transfer). |
| 22 Aug 2003 | 3 SA5 4QB | Semi-detached | £75,000 | Leasehold. |
| 28 Jul 2002 | 3 SA5 4QB | Semi-detached | £55,000 | Leasehold. |
| 15 Sep 2000 | 6 SA5 4QB | Detached | £69,995 | Leasehold. |
| 10 Jan 2020 | 7 SA5 4QB | Semi-detached | £120,000 | |
| 25 Jul 2018 | 7 SA5 4QB | Semi-detached | £113,500 | |
| 1 Feb 2011 | 7 SA5 4QB | Semi-detached | £94,500 | |
| 19 Nov 2001 | 7 SA5 4QB | Semi-detached | £47,500 | |
| 19 Nov 2001 | 7 SA5 4QB | Semi-detached | £47,500 | Leasehold. |
| 18 Apr 1997 | 7 SA5 4QB | Semi-detached | £26,250 | Leasehold. |
| 5 Apr 2022 | 9 SA5 4QB | Semi-detached | £187,000 | |
| 25 Jan 2021 | 9 SA5 4QB | Semi-detached | £155,000 | |
| 20 Mar 2015 | 9 SA5 4QB | Semi-detached | £133,000 | |
| 14 Feb 2014 | 10 SA5 4QB | Semi-detached | £93,500 | |
| 30 Nov 2017 | 11 SA5 4QB | Semi-detached | £117,000 | |
| 25 Nov 2013 | 11 SA5 4QB | Semi-detached | £102,500 | |
| 27 Jul 2017 | 12 SA5 4QB | Semi-detached | £145,000 | |
| 15 Oct 2012 | 15 SA5 4QB | Semi-detached | £110,000 | |
| 19 Jul 2002 | 15 SA5 4QB | Semi-detached | £58,500 | |
| 8 Dec 2000 | 15 SA5 4QB | Semi-detached | £53,000 | |
| 22 Aug 2003 | 16 SA5 4QB | Semi-detached | £75,000 | Leasehold. |
| 3 Aug 2007 | 18 SA5 4QB | Detached | £129,950 | |
| 18 Dec 1998 | 18 SA5 4QB | Detached | £46,000 | |
| 11 Jul 1997 | 18 SA5 4QB | Detached | £45,000 | |
| 18 Feb 2026 | 19 SA5 4QB | Semi-detached | £210,000 | |
| 22 Mar 2002 | 19 SA5 4QB | Semi-detached | £59,995 | |
| 26 Feb 1997 | 19 SA5 4QB | Semi-detached | £38,000 | |
| 18 Jun 2010 | 20 SA5 4QB | Semi-detached | £96,000 | Leasehold. |
| 29 Jun 2001 | 20 SA5 4QB | Semi-detached | £56,000 | Leasehold. |
| 1 Nov 1996 | 20 SA5 4QB | Semi-detached | £40,500 | Leasehold. |
House prices and rents in Swansea
A typical home in Swansea cost £211,177 in August 2026, 1.8% more than a year before. That is 21% more than five years earlier and 55% more than ten years earlier.
| Home | Typical price, Aug 2026 |
|---|---|
| Detached | £335,628 |
| Semi-detached | £216,411 |
| Terraced | £174,313 |
| Flat or maisonette | £112,603 |
| Bought by a first-time buyer | £182,295 |
Private renters in Swansea paid £853 a month on average in September 2026, 6% more than a year before. That is 42% more than five years earlier.
| Home | Average rent a month, Sep 2026 |
|---|---|
| One bedroom | £689 |
| Two bedrooms | £798 |
| Three bedrooms | £898 |
| Four or more bedrooms | £1,276 |
Energy performance certificates
13 homes with a current certificate; median floor area 63 m². Most common: House, semi-detached (10); Bungalow, detached (2); House, detached (1). Built: 1983-1990 (6); 1976-1982 (3); 1967-1975 (2). Tenure at assessment: owner-occupied (10); rented (social) (2).
Each home's certificates and sales (13 addresses)
- 2 St. Nicholas Close, Waunarlwydd
- 3, St. Nicholas Close, Waunarlwydd
- 6, St. Nicholas Close, Waunarlwydd
- 7 St. Nicholas Close, Waunarlwydd
- 8, St. Nicholas Close, Waunarlwydd
- 9 St. Nicholas Close, Waunarlwydd
- 11, St. Nicholas Close, Waunarlwydd
- 12, St. Nicholas Close, Waunarlwydd
- 15, St. Nicholas Close, Waunarlwydd
- 19 St. Nicholas Close, Waunarlwydd
- 20, St. Nicholas Close, Waunarlwydd
- 23 St. Nicholas Close, Waunarlwydd, SWANSEA
- 24, St. Nicholas Close, Waunarlwydd
Gas and electricity use
Homes with gas used 9,270 kWh of it on average in 2024, 8% less than the district's 10,096 kWh, and 2,883 kWh of electricity, 5% more than the district's 2,749 kWh. There are gas meters for about 100% of the homes.
| Postcode | Electricity meters | Typical electricity | Gas meters | Typical gas |
|---|---|---|---|---|
| SA5 4QB | 23 | 1,999 kWh | 23 | 8,445 kWh |
| SA5 4QE | 51 | 1,970 kWh | 52 | 9,323 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 SA5.
Council tax
What each band costs in Swansea in 2026-27: Band D £2,238 a year on average, including the police and community council charges.
| A | B | C | D | E | F | G | H | I |
|---|---|---|---|---|---|---|---|---|
| £1,492 | £1,741 | £1,990 | £2,238 | £2,736 | £3,233 | £3,730 | £4,477 | £5,223 |
Homes by band in the neighbourhood around this street: most are in band C (51% of about 730 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 directions, tree preservation orders and green belt: Wales has no national record of these; the council's planning department holds them.
Energy projects nearby
3 energy projects near the street's postcodes, 2 of them not yet operating.
| Project | Kind | Size | Stage | Distance |
|---|---|---|---|---|
| Cockett Valley Swansea 2014/1837 | Solar farm | 4 MW | Operational Mar 2017 | 650 m (0.4 miles) |
| Parc Solar Caenewydd Welsh Government (NSIP) CAS-01900-V0J7C7 | Solar farm | 42 MW | Being built May 2026 | 1.9 km (1.2 miles) |
| Parc Solar Caenewydd Welsh Government (NSIP) CAS-01900-V0J7C7 | Battery storage | 46 MW | Being built May 2026 | 1.9 km (1.2 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
Street works permits come from the Department for Transport's Street Manager, which covers England only.
Flood risk
None of the 81 address points in this street's postcodes is in an area at high, medium or low risk of flooding from rivers, the sea or surface water on Natural Resources Wales's map. Outside those areas the chance is under 0.1% (1 in 1,000) a year.
High: 3.3% (1 in 30) or more chance of flooding a year. Medium: 1% to 3.3%. Low: 0.1% to 1%. The map allows for flood defences. Address points are every property record (UPRN) in the postcode, each counted if it is in an area or within 5 m of one (the maps stop at building walls); a few are not homes, such as garages, business units or caravan pitches. 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. Welsh zones include an allowance for climate change.
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 in this record, which covers the overflows reported to the Environment Agency: most of Wales's are reported to Natural Resources Wales instead.
Coal mining
2 of the street's 2 postcodes are in a coalfield, in a low risk area: coal was mined in the area, but no workings shallow enough to matter for building are recorded.
Conveyancers usually still order a coal mining search (CON29M) for a home in a coalfield.
Radon
The highest radon potential in the 1 km squares around the street's postcodes is 5 to 10%: up to that share of homes there is estimated to be at or above the Action Level of 200 becquerels per cubic metre. At least part of that area is a radon Affected Area, where 1% or more of homes are.
Radon is a natural radioactive gas from the ground that can build up indoors; long exposure raises the risk of lung cancer. A three-month test with two small detectors is the only way to know a home's level, and a high level can usually be brought down with a sump or better ventilation. Homes built here in recent decades should have radon protection under the building regulations (basic protection from 3%, full protection from 10%). UKHSA sells a radon report for a single address from its detailed map at ukradon.org.
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 24 addresses are between 49 m and 58 m above sea level (55 m on average); the ground rises about 10 m from the lowest to the highest.
Broadband
| Postcode | Superfast (30 Mbit/s+) | Ultrafast (300 Mbit/s+) | Gigabit | Below 10 Mbit/s |
|---|---|---|---|---|
| SA5 4QB | 100% | 100% | 100% | 0% |
| SA5 4QE | 100% | 100% | 100% | 0% |
Getting around
| Nearest | Distance | |
|---|---|---|
| Railway stations | Gowerton 159,000 journeys in 2024–25 | 1.5 km (0.9 miles) |
| Swansea 2.3 million journeys in 2024–25 | 5.8 km (3.6 miles) | |
| Bynea 2,720 journeys in 2024–25 | 6.5 km (4 miles) | |
| Bus stops | 12 stops within 400 m (0.2 miles), 28 within 800 m (0.5 miles); nearest Westwinds Close Waunarlwydd | 90 m |
| Bus or coach station | Gorseinon Bus Station Stand 1 | 3.6 km (2.2 miles) |
| Ferry terminal | Swansea Queens Dock Ferry Terminal Swansea Ferry Terminal | 7.2 km (4.5 miles) |
| Car parks | Ffordd Beck Parking | 1.9 km (1.2 miles) |
| EV charging points | Be.EV Charging Station | 2.7 km (1.7 miles) |
| Airport with scheduled flights | Cardiff International Airport CWL | 54.2 km (34 miles) |
Local services
| Nearest | Distance | |
|---|---|---|
| GP surgeries | Estuary Group Practice | 1.8 km (1.1 miles) |
| Pharmacies | Well | 1.8 km (1.1 miles) |
| NHS dentists | 1 practice within 1.6 km (1 mile); nearest Dental Surgery | 1.5 km (0.9 miles) |
| Hospital | Cefn Coed Hospital | 2.6 km (1.6 miles) |
| Police station | Sketty Police Station | 3.2 km (2 miles) |
| Cash machines | 1 machine within 800 m (0.5 miles); nearest C K Food Stores, Waunarlwydd | 730 m (0.5 miles) |
Parks and green space
| Nearest | Distance | |
|---|---|---|
| Park or garden | 1 within 800 m (0.5 miles); nearest Unnamed 1.0 ha | 140 m |
| Play area | 2 within 800 m (0.5 miles); nearest Unnamed 280 m² | 180 m |
| Playing field | 1 within 800 m (0.5 miles); nearest Unnamed 1.0 ha | 640 m (0.4 miles) |
| Allotments | Unnamed 5,480 m² | 1.5 km (0.9 miles) |
Within 800 m (0.5 miles): 1 park or garden, 1.0 hectares in all.
Landmarks
| Name | What it is | From the middle of the street |
|---|---|---|
| Bishwell Common | Wood | 900 m (0.6 miles) west |
| Cwmllwyd Wood | Wood | 1 km (0.6 miles) south-east |
| Cwm y Lladron | Valley | 2.1 km (1.3 miles) north |
| Olchfa Wood | Wood | 2.5 km (1.6 miles) south |
| Allt-wen Wood | Wood | 2.6 km (1.6 miles) north-west |
| Pwll Mawr | Lake or reservoir | 3.2 km (2 miles) south-west |
Air quality
| Pollutant | Here | UK limit | WHO guideline |
|---|---|---|---|
| Nitrogen dioxide (NO2) | 7.7 | 40 | 10 |
| Fine particles (PM2.5) | 5.0 | 20 | 5 |
| Particles (PM10) | 7.3 | 40 | 15 |
All three are within both the UK limits and the WHO guidelines.
Road and rail noise
| Level | Road traffic | Railways |
|---|---|---|
| 55 to 59 | 7 | 0 |
| Under 55 | 17 | 24 |
7 of the street's 24 addresses are 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 Swansea: see them on the Swansea page.
Nearest schools
| School | Phase | Ages | Distance | Inspection | Exam results |
|---|---|---|---|---|---|
| Waunarlwydd Primary School English medium | Primary | 3–11 | 400 m (0.2 miles) | Estyn reports · My Local School | Not published in Wales |
| Ysgol Gymraeg Y Login Fach Welsh medium | Primary | 3–11 | 730 m (0.5 miles) | Estyn reports · My Local School | Not published in Wales |
| Gowerton Comprehensive School English medium | Secondary | 11–19 | 1.1 km (0.7 miles) | Estyn reports · My Local School | Not published in Wales |
| Ysgol Gyfun Gwyr Welsh medium | Secondary | 11–19 | 1.4 km (0.9 miles) | Estyn reports · My Local School | Not published in Wales |
| DUNVANT Primary SCHOOL English medium | Primary | 3–11 | 1.8 km (1.1 miles) | Estyn reports · My Local School | Not published in Wales |
| Hendrefoilan Primary English medium | Primary | 3–11 | 1.9 km (1.2 miles) | Estyn reports · My Local School | Not published in Wales |
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. Wales publishes no school results tables.
Nurseries and childcare
Ofsted registers childcare in England only. In Wales, nurseries, playgroups and childminders are registered and inspected by Care Inspectorate Wales, whose directory of services lists them with their reports.
Food hygiene ratings nearby
| Business | Type | Distance | Rating | Rated |
|---|---|---|---|---|
| Ty Victoria SA5 4TB | Hospitals/Childcare/Caring Premises | 200 m | 5 Very good | 8 Sep 2026 |
| Bryn Road Service Station SA5 4RA | Retailers - other | 280 m | 4 Good | 10 Jan 2020 |
| Ty Waunarlwydd SA5 4SN | Hospitals/Childcare/Caring Premises | 310 m | 4 Good | 30 Oct 2025 |
| The farmers Arms SA5 4SL | Pub/bar/nightclub | 340 m | 3 Generally satisfactory | 11 Nov 2025 |
| Dinu's Pizza SA5 4SL | Restaurant/Cafe/Canteen | 340 m | Awaiting inspection | |
| Jak's Stores SA5 4SN | Retailers - other | 380 m | 5 Very good | 25 Jun 2026 |
| Waunarlwydd Primary School SA5 4QS | School/college/university | 400 m (0.2 miles) | 5 Very good | 13 Mar 2025 |
| Waunarlwydd Wraparound (childcare) SA5 4QS | School/college/university | 400 m (0.2 miles) | 5 Very good | 13 Mar 2019 |
| M and S Newsagents SA5 4SX | Retailers - other | 470 m (0.3 miles) | 4 Good | 9 May 2018 |
| Moorland SA5 4SQ | Hospitals/Childcare/Caring Premises | 500 m (0.3 miles) | 5 Very good | 11 Nov 2025 |
Crime within 250 m
| Category | Crimes |
|---|---|
| Anti-social behaviour | 9 |
| Violence and sexual offences | 8 |
| Public order | 4 |
| Other crime | 1 |
| Possession of weapons | 1 |
| Criminal damage and arson | 1 |
| Vehicle crime | 1 |
Most of these are attached to: On or near St Nicholas Close (9); On or near Bryn Road (6); On or near Bevan Way (5); On or near Westwinds Close (3); On or near Camrose Drive (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
The busiest counted road within 500 m (0.3 miles) is the B4295, with 9,916 motor vehicles a day on average in 2025, 380 m from the street's postcodes.
| Road | Between | Vehicles a day | Lorries | Ten years before | Distance |
|---|---|---|---|---|---|
| B4295 | Not recorded | 9,916 estimated; counted 2024 | 1% | 380 m |
Each figure is the annual average daily flow: the motor vehicles passing the count point, both ways, on an average day of the year. A point is counted by hand on a weekday every few years and estimated from the trend on similar roads in between. Lorries are heavy goods vehicles, as a share of all motor vehicles.
People and work
Who lives here
| Around this street | Wales | |
|---|---|---|
| Median age | 48 | 43 |
| Children under 15 | 16% | 17% |
| Aged 65 and over | 22% | 21% |
Homes
| Around this street | Wales | |
|---|---|---|
| Owned (outright or with a mortgage) | 80% | 66% |
| Owned outright | 45% | 38% |
| Shared ownership | 0% | under 1% |
| Social rented | 6% | 17% |
| Private rented | 15% | 17% |
Work and commuting
| Around this street | Wales | |
|---|---|---|
| Adults (16 and over) in work | 58% | 54% |
| Unemployment (of those working or looking for work) | 0% | 6% |
| Retired (of adults) | 25% | 25% |
| Long-term sick or disabled (of adults) | 5% | 6% |
| Work mainly from home (of those in work) | 20% | 26% |
| Travel to work by car or van | 73% | 61% |
| By train, Underground, metro or tram | under 1% | under 1% |
| By any public transport, including bus | under 1% | 3% |
| On foot or by bicycle | 2% | 8% |
| Work within 10 km (6 miles) of home (of those who travel to work) | 78% | 60% |
| Work 30 km (19 miles) or more away | 8% | 10% |
Education and languages
| Around this street | Wales | |
|---|---|---|
| Degree or other higher qualification, Level 4+ (of adults) | 35% | 32% |
| No qualifications | 9% | 20% |
| Apprenticeship as highest qualification | 7% | 6% |
| Main language English or Welsh (aged 3 and over) | 97% | 97% |
| Cannot speak English well or at all | 0% | under 1% |
Deprivation
The neighbourhood around this street is in decile 9 of 10 on the Welsh Index of Multiple Deprivation 2025, where 1 is the most deprived tenth of Wales's 1,917 neighbourhoods and 10 the least.
What has changed
- Food hygiene ratings That Italian Kitchen (takeaway/sandwich shop, SA5 4SL) is no longer listed; it was rated 5 Very good found 7 November 2026
Postcodes on this street
Nearby streets
Westwinds Close · Bevan Way · Bryn Road · Camrose Drive · Brithwen Road · St Govan's Place · Heol Will George · Caergynydd Road · Sardis Close · Swansea Road · Greenways · Heol Cleddau
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.