Landsdown Drive Northampton

45 addresses across 2 postcodes (NN3), about 270 m long, classed as a local road. USRN 28700853.

  • Sales: 60 recorded sales since 1995; in 2025 the median was £240,000 across 2 sales.
  • Energy: 30 homes have an energy certificate (C: 4, D: 16, E: 7, F: 2, G: 1).
  • Flood: No address on its postcodes is in an area at high or medium risk of flooding from rivers, the sea or surface water.
  • Council tax: Most homes around it are in council tax band C; Band D in West Northamptonshire costs £2,487 a year in 2026-27.
  • Broadband: Gigabit broadband is available to 100% of premises.
  • Transport: The nearest railway station is Northampton, about 4.9 km (3.1 miles) away in a straight line.
  • Green space: The nearest park or garden is about 240 m away.
  • Air: Background air pollution in 2024 was 11.2 µg/m³ of nitrogen dioxide and 7.7 of PM2.5, within UK legal limits.
  • Height: Its addresses are 90 to 102 m above sea level.
  • Noise: 1 of its 45 addresses is modelled at 55 dB or more from road traffic.
  • Doctors: The nearest GP surgery is Mayfield Surgery, about 1.2 km (0.7 miles) away, with 3 practices within 1.6 km (1 mile).
  • People: About 290 people lived in the census areas around it in 2021; 89% of households owned their home and 26% of adults held a degree or other higher qualification.
  • Crime: 32 crimes were recorded within 250 m between September 2025 and August 2026, most often violence and sexual offences.

Sales on this street

Source: HM Land Registry Price Paid Data, sales registered up to 28 August 2026, loaded 28 October 2026. Sales reach the register two weeks to two months after completion, so the last two months are incomplete. Matched by postcode and street name.

Sales by year (standard sales only; repossessions and buy-to-let transfers excluded)
YearSalesMedian priceLowestHighest
20252£240,000£220,000£260,000
20241£250,000£250,000£250,000
20223£265,000£245,000£280,000
20201£255,000£255,000£255,000
20192£223,500£195,000£252,000
20184£235,000£170,000£735,000
20162£182,250£165,000£199,500
20151£173,000£173,000£173,000
20143£162,000£140,000£175,000
20132£155,000£125,000£185,000
20123£146,000£130,000£192,000
20114£133,500£110,000£147,500
Most recent sales (latest 50 of 60)
DateAddressTypePriceNotes
1 Oct 202516 NN3 3EDSemi-detached£220,000
28 Aug 20258 NN3 3EDSemi-detached£260,000
31 Jul 202516 NN3 3EDSemi-detached£168,000Not a standard sale (repossession, buy-to-let or transfer).
12 Jan 20246 NN3 3EDSemi-detached£250,000
1 Nov 202317 NN3 3EDSemi-detached£603,000Not a standard sale (repossession, buy-to-let or transfer).
4 Nov 202228 NN3 3EDSemi-detached£280,000
21 Oct 202239 NN3 3EDSemi-detached£245,000
24 Jun 202220 NN3 3EDSemi-detached£265,000
14 Aug 202026 NN3 3EDSemi-detached£255,000
5 Dec 201927 NN3 3EDSemi-detached£252,000
10 Oct 201935 NN3 3EDSemi-detached£195,000
4 Oct 201814 NN3 3EDSemi-detached£170,000
19 Jun 201824 NN3 3EDSemi-detached£225,000
9 May 201833 NN3 3EDSemi-detached£245,000
15 Mar 201817 NN3 3EDSemi-detached£735,000
18 Oct 201717 NN3 3EDSemi-detached£306,000Not a standard sale (repossession, buy-to-let or transfer).
8 Jul 201625 NN3 3EDSemi-detached£199,500
27 May 201640 NN3 3EDSemi-detached£165,000
15 Sep 201533 NN3 3EDSemi-detached£173,000
14 Nov 201428 NN3 3EDSemi-detached£162,000
17 Apr 201422 NN3 3EDSemi-detached£175,000
10 Jan 201411 NN3 3EDSemi-detached£140,000
27 Sep 20135 NN3 3EDSemi-detached£185,000
2 Jan 201341 NN3 3EDSemi-detached£125,000
8 Jun 201227 NN3 3EDSemi-detached£192,000
31 May 201226 NN3 3EDSemi-detached£130,000
18 May 201232 NN3 3EDSemi-detached£146,000
25 Nov 20114 NN3 3EDSemi-detached£147,500
16 Sep 201145 NN3 3EDSemi-detached£110,000
13 Jun 201115 NN3 3EDSemi-detached£143,000
18 Apr 201115 NN3 3EDSemi-detached£124,000
27 Aug 20095 NN3 3EDSemi-detached£130,000
8 May 200927 NN3 3EDSemi-detached£147,000
16 May 20081 NN3 3EDSemi-detached£145,500
31 Oct 20079 NN3 3EDSemi-detached£166,000
4 Sep 20074 NN3 3EDSemi-detached£134,000
3 Nov 200642 NN3 3EDDetached£155,000
19 Oct 200633 NN3 3EDSemi-detached£118,000
25 Aug 200631 NN3 3EDSemi-detached£137,000
18 Aug 200620 NN3 3EDSemi-detached£142,500
24 Jun 200512 NN3 3EDSemi-detached£157,500
11 Nov 200319 NN3 3EDSemi-detached£139,995
21 Mar 200336 NN3 3EDSemi-detached£138,000
3 Feb 200327 NN3 3EDSemi-detached£124,000
7 Sep 200142 NN3 3EDDetached£87,500
23 Jul 20017 NN3 3EDSemi-detached£99,000
28 Jun 200135 NN3 3EDSemi-detached£81,000
27 Apr 200125 NN3 3EDSemi-detached£102,000
12 Mar 200117 NN3 3EDSemi-detached£89,000
5 Jan 200118 NN3 3EDSemi-detached£89,995

Energy performance certificates

Source: Energy Performance of Buildings Register (MHCLG), register as at 1 November 2026. Latest certificate per address; certificates last ten years, so the oldest here dates from June 2009 and some homes have none. Address data © Ordnance Survey and Royal Mail, shown for understanding the energy efficiency of buildings only.

30 homes with a current certificate; median floor area 66 m². Most common: Bungalow, semi-detached (24); House, semi-detached (5); Bungalow, detached (1). Built: 1950-1966 (25); 1930-1949 (5). Tenure at assessment: owner-occupied (16); rented (private) (5).

Each home's certificates and sales (17 addresses)

Council tax

What each band costs in West Northamptonshire in 2026-27: Band D £2,487 a year on average, including the police, fire and any county and parish charges.

ABCDEFGH
£1,658£1,934£2,210£2,487£3,039£3,592£4,144£4,973

Homes by band in the neighbourhood around this street: most are in band C (39% of about 850 homes).

Sources: Valuation Office Agency, Council Tax: stock of properties, homes at 31 March 2026 (counts rounded to the nearest 10; some small counts withheld), for the neighbourhood (census area of about 700 homes) around it, not just this street; Ministry of Housing, Communities and Local Government, council tax levels 2026-27. Bands are charged as fixed shares of Band D; the actual bill depends on the parish and on discounts such as the single-person discount. Check a home's own band with the official council tax band checker.

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)

Source: planning.data.gov.uk (Ministry of Housing, Communities and Local Government), compiled from councils and, for listed buildings, Historic England's National Heritage List. Conservation areas, Article 4 directions, tree preservation areas and the green belt are checked at each postcode's centre. Listed buildings and protected trees are counted on or by this street. Councils publish Article 4 directions, tree preservation orders and brownfield registers to different standards, and some not yet. Planning applications are not here: there is no national open record of them yet.

Roadworks

Finished in the last three months

  • 12 August 2026 to 14 August 2026: ANGLIAN WATER, Utility repair and maintenance works, some carriageway incursion, on the footway (minor works)

Source: Department for Transport, Street Manager open data, permits and works up to 30 September 2026. It is published once a month, so works arranged or started since then are not shown, and dates are the ones planned unless the works have started or finished. Emergency works are often permitted after they begin.

Flood risk

Rivers, the sea or surface water: in this street's postcodes, 0 addresses are in areas at high risk, 0 at medium risk and 5 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.

PostcodePlanning zoneAddresses at high / medium / low riskGroundwater
NN3 3EDnot in 2 or 3 0 / 0 / 3 unlikely
NN3 3EBnot in 2 or 3 0 / 0 / 2 unlikely

Sources: Environment Agency Flood risk: postcode search tool data (loaded 29 October 2026), Risk of Flooding from Rivers and Sea: postcodes in areas at risk (loaded 29 October 2026) and Flood Map for Planning (loaded 28 October 2026). Flood zones are checked at each postcode's centre point. These are models of areas, which their publishers say are not suitable for showing whether an individual property is at risk, and they do not cover flooding from sewers or drains. Check an address on the official long-term flood risk service.

© Environment Agency copyright and/or database right 2026. All rights reserved. Some features are based on digital spatial data from the Centre for Ecology & Hydrology, © NERC (CEH); the postcode data is produced in part from PAF® and Multiple Residence Data, © Royal Mail Group Limited.

Height above sea level

The street's 45 addresses are between 90 m and 102 m above sea level (96 m on average); the ground rises about 12 m from the lowest to the highest.

Source: Ordnance Survey, OS Terrain 50, July 2026: the height of the ground on a 50 m grid, read at each address, in metres above Ordnance Datum (mean sea level at Newlyn). It is the lie of the land, not floor or threshold levels, and is accurate to a few metres. Being low-lying is not in itself a flood risk; the flood section above says what the flood maps show.

Broadband

Source: Ofcom Connected Nations, data as at January 2026. Percentages are of premises in each postcode that can get the service, not take-up or speed achieved.

Availability by postcode (% of premises)
PostcodeSuperfast (30 Mbit/s+)Ultrafast (300 Mbit/s+)GigabitBelow 10 Mbit/s
NN3 3EB100%100%100%0%
NN3 3ED100%100%100%0%

Getting around

Sources: Department for Transport, NaPTAN (every public transport stop), as at 31 October 2026; Office of Rail and Road, Estimates of station usage 2024–25 (which stations are on the National Rail network, and their journeys: entries and exits in the year to March); OurAirports (public domain, kept by volunteers); car parks and charging points from Overture Maps Foundation, release 2026-10-21.0, which gathers business listings from Meta, Microsoft, Foursquare and others: not an official register, so some will be missing, private or out of date. Distances are straight lines from the middle of the street, not routes, and say nothing about how often anything runs. Stations opened since the end of ORR's year appear when ORR publishes the next one, each December; heritage railways are left out.

NearestDistance
Railway stationsNorthampton 2.8 million journeys in 2024–254.9 km (3.1 miles)
Wellingborough 981,000 journeys in 2024–2512.4 km (7.7 miles)
Bus stops9 stops within 400 m (0.2 miles), 54 within 800 m (0.5 miles); nearest Charnwood Avenue Westone80 m
Bus or coach stationNorthampton Bus Interchange4.4 km (2.7 miles)
Car parksCo-Op Barry Road Car Park2.7 km (1.7 miles)
EV charging pointsevyve Charging Station1.7 km (1 mile)
Airport with scheduled flightsLondon Luton Airport LTN53.6 km (33 miles)

Local services

Sources: NHS Organisation Data Service, as at 31 October 2026: GP practices, community pharmacies and dental practices with an NHS contract, open now, each placed at the centre of its postcode; hospitals are NHS trust and Welsh health board sites named as hospitals, and may not have an emergency department. Police stations and cash machines from Overture Maps Foundation, release 2026-10-21.0, which gathers business listings: not an official register, so some will be missing or out of date. Distances are straight lines from the middle of the street. Nothing here says whether a practice is taking new patients or a dentist new NHS patients.

NearestDistance
GP surgeries3 practices within 1.6 km (1 mile); nearest Mayfield Surgery1.2 km (0.7 miles)
Pharmacies3 pharmacies within 1.6 km (1 mile); nearest Boots460 m (0.3 miles)
NHS dentists2 practices within 1.6 km (1 mile); nearest Weston Favell Primary Care1.2 km (0.7 miles)
HospitalSt Edmund's Hospital2.6 km (1.6 miles)
Police stationNorthamptonshire Police370 m
Cash machines1 machines within 800 m (0.5 miles); nearest The Cooperative Food Bushland Road750 m (0.5 miles)

Parks and green space

Source: Ordnance Survey, OS Open Greenspace, April 2026: public parks and gardens, play spaces, playing fields and allotments, with their entrances. Distances are straight lines from the middle of the street to a site's nearest entrance (or its edge where none is recorded), not walking routes; sizes are the area OS maps for each site. Some sites, such as school playing fields, may not be open to the public.

NearestDistance
Park or garden4 within 800 m (0.5 miles); nearest Unnamed 5,340 m²240 m
Largest park within 800 m (0.5 miles)Unnamed 3.4 ha540 m (0.3 miles)
Play area1 within 800 m (0.5 miles); nearest Unnamed 1,710 m²330 m
Playing field1 within 800 m (0.5 miles); nearest Unnamed 1.5 ha590 m (0.4 miles)
AllotmentsUnnamed 2.3 ha830 m (0.5 miles)

Within 800 m (0.5 miles): 4 parks and gardens, 11 hectares in all.

Landmarks

The nearest historic landmark is Church of Saint Peter, a listed building (Grade II*), 1 km (0.6 miles) south. 13 listed buildings are within 1 km (0.6 miles), 1 of them Grade II*.

Historic places
NameWhat it isFrom the middle of the street
Church of Saint PeterListed building, Grade II*1 km (0.6 miles) south
Battle of Northampton 1460Registered battlefield4.8 km (3 miles) south-west
Natural landmarks within 5 km (3.1 miles)
NameWhat it isFrom the middle of the street
The SpinneyWood1.6 km (1 mile) south-west
Lings WoodWood1.7 km (1.1 miles) north-east
Round SpinneyWood2.1 km (1.3 miles) north
Crowlane SpinneyWood2.3 km (1.4 miles) south-east
Brickyard SpinneyWood2.5 km (1.5 miles) north-west
Pike PondLake or reservoir3.5 km (2.2 miles) north-east

Sources: Historic England's registers through planning.data.gov.uk (MHCLG), and Cadw through DataMapWales (Welsh Government): World Heritage Sites within 10 km (6.2 miles), battlefields within 5 km (3.1 miles), registered parks and gardens within 3 km (1.9 miles), scheduled monuments within 2 km (1.2 miles), and Grade I and II* listed buildings within 1 km (0.6 miles). Ordnance Survey, OS Open Names, October 2026: named hills, valleys, lakes, woods, wetlands and coast (it has no rivers). Distances are in a straight line to the middle of each site, and being on a register does not mean there is public access.

Air quality

Source: Defra, modelled background air pollution, annual means for 2024, for the 1 km square that holds the middle of the street. These are background levels, away from the kerb: beside a busy road nitrogen dioxide in particular can be several times higher. UK limits are the legal annual limits for England and Wales; the World Health Organization's 2021 guidelines are much stricter, and most towns and cities are above them.

Annual means in µg/m³ (micrograms per cubic metre of air)
PollutantHereUK limitWHO guideline
Nitrogen dioxide (NO2)11.24010
Fine particles (PM2.5)7.7205
Particles (PM10)13.24015

All three are within the UK legal limits; nitrogen dioxide and PM2.5 are above the WHO guideline, as in most towns and cities.

Road and rail noise

Source: Defra, strategic noise mapping Round 4 (England), modelled for 2021 and published in December 2023, and its airport maps of the same round for the fifteen largest English airports, published in April 2026: Lden, the average sound level over a whole day with extra weight for the evening and night, on a 10 m grid, read at each address. These are models of traffic, not measurements; they leave out smaller airports and airfields, industry and neighbours, and a room at the back of a house is often much quieter than the front. The World Health Organization's guidelines are 53 dB for road traffic, 54 dB for railways and 45 dB for aircraft (below the lowest level shown here).

Addresses by modelled noise level (Lden, dB)
LevelRoad trafficRailways
55 to 5910
Under 554445

1 of the street's 45 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 West Northamptonshire: see them on the West Northamptonshire page.

Nearest schools

Source: Get Information About Schools (Department for Education), 1 November 2026; Ofsted monthly management information as at September 2026. Distances are straight lines from the middle of the street to the school; catchments and admissions are not shown. Since November 2025 Ofsted gives report-card grades by area, not one overall grade; older grades stand until a school is re-inspected.

SchoolPhaseAgesDistanceInspection
Weston Favell AcademySecondary11–18310 m Good (Mar 2024, overall grade under the previous framework)
The Arbours Primary AcademyPrimary4–11590 m (0.4 miles) Outstanding (Jul 2023, overall grade under the previous framework)
Northampton Academy ChristianSecondary11–18600 m (0.4 miles) Outstanding (Mar 2023, overall grade under the previous framework)
Headlands Primary SchoolPrimary4–11630 m (0.4 miles) No published inspection
Lumbertubs Primary SchoolPrimary3–11750 m (0.5 miles) Good (Jan 2023, overall grade under the previous framework)
Northampton College16 plus16–99770 m (0.5 miles) No published inspection
Weston Favell CofE Primary School Church of EnglandPrimary3–11790 m (0.5 miles) No overall grade (Feb 2025, graded inspection without an overall judgement): Quality of education: Outstanding; Behaviour and attitudes: Outstanding; Personal development: Outstanding; Leadership and management: Outstanding
St Gregory's Catholic Primary School Roman CatholicPrimary3–11860 m (0.5 miles) Good (Sep 2022, overall grade under the previous framework)
Lings Primary SchoolPrimary3–111.1 km (0.7 miles) Good (Mar 2023, overall grade under the previous framework)
Standens Barn Primary SchoolPrimary4–111.2 km (0.8 miles) No published inspection
Eastfield AcademyPrimary2–111.3 km (0.8 miles) Good (Jan 2020, overall grade under the previous framework)
Woodvale Primary AcademyPrimary3–111.4 km (0.9 miles) Good (Dec 2023, overall grade under the previous framework)

Food hygiene ratings nearby

Source: Food Standards Agency, Food Hygiene Rating Scheme, extract of 1 November 2026. Each rating is shown with the date it was given; a business may have been re-inspected since the extract. Within 500 m (0.3 miles) of the middle of the street.

BusinessTypeDistanceRatingRated
Charnwood Food & Wine NN3 3DXRetailers - other80 m5 Very good12 Feb 2024
Northamptonshire Police NN3 8DPOther catering premises270 mAwaiting inspection
ROYAL NAYAB NN3 8JPRestaurant/Cafe/Canteen350 m3 Generally satisfactory16 Apr 2026
Papa Johns Takeaway/sandwich shop360 m5 Very good13 Apr 2026
5 Akhis Northampton NN3 8JPRestaurant/Cafe/Canteen360 m5 Very good13 Mar 2025
Emmanuel Church NN3 8JRRestaurant/Cafe/Canteen410 m (0.3 miles)5 Very good15 Sep 2023
Christine's Cake Creations NN3 3RRRestaurant/Cafe/Canteen450 m (0.3 miles)5 Very good4 Dec 2012
One Beyond Ltd Retailers - other460 m (0.3 miles)Awaiting inspection
Refuel inc NN3 8JZManufacturers/packers460 m (0.3 miles)Awaiting inspection
VAARISTA WESTON FAVELL NN3 8JZTakeaway/sandwich shop460 m (0.3 miles)Awaiting inspection
Savers Health and Beauty Ltd NN3 8JZRetailers - other460 m (0.3 miles)Exempt
Domino's Pizza NN3 8JZTakeaway/sandwich shop460 m (0.3 miles)5 Very good6 Aug 2026
Andrews Emporium NN3 8JZRestaurant/Cafe/Canteen460 m (0.3 miles)5 Very good1 Nov 2023
Card Factory NN3 8JZRetailers - other460 m (0.3 miles)Exempt
Holland and Barrett Retailers - other460 m (0.3 miles)5 Very good13 Jul 2015

Crime within 250 m

Source: data.police.uk street-level crime, September 2025 to August 2026. Police forces move every crime to the nearest of about 760,000 anonymised map points before publishing, so these are crimes near this street, not on it, and a busy point can collect crimes from a wider area. Counts are of records, not convictions.

32 recorded crimes by category
CategoryCrimes
Violence and sexual offences16
Anti-social behaviour7
Vehicle crime4
Other theft2
Drugs2
Criminal damage and arson1

Most of these are attached to: On or near Ashley Way (14); On or near Charnwood Avenue (8); On or near Landsdown Drive (5); On or near Moorland Close (3); On or near Coaching Walk (2).

People and work

Source: ONS Census 2021, taken on 21 March 2021, for the Output Area (a small census area of about 125 households) that this street's postcodes are in: 286 residents in 154 households. The census was taken during a lockdown, so working from home is high and travel to work low compared with now. ONS swaps a few records between neighbouring areas and adds small amounts of noise to counts to protect privacy, so small differences mean little. Industry is not published for areas this small.

Who lives here

Around this streetEngland
Median age6140
Children under 158%17%
Aged 65 and over44%18%

Homes

Around this streetEngland
Owned (outright or with a mortgage)89%61%
Owned outright67%33%
Shared ownership0%1%
Social rented0%17%
Private rented11%21%

Work and commuting

Around this streetEngland
Adults (16 and over) in work43%57%
Unemployment (of those working or looking for work)3%6%
Retired (of adults)47%22%
Long-term sick or disabled (of adults)3%4%
Work mainly from home (of those in work)28%32%
Travel to work by car or van63%48%
By train, Underground, metro or tramunder 1%4%
By any public transport, including bus3%8%
On foot or by bicycle6%10%
Work within 10 km (6 miles) of home (of those who travel to work)83%65%
Work 30 km (19 miles) or more away8%8%

Education and languages

Around this streetEngland
Degree or other higher qualification, Level 4+ (of adults)26%34%
No qualifications24%18%
Apprenticeship as highest qualification11%5%
Main language English (aged 3 and over)95%91%
Cannot speak English well or at allunder 1%2%

Deprivation

The neighbourhood around this street is in decile 8 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.

Source: English Indices of Deprivation 2025 (Ministry of Housing, Communities and Local Government), by LSOA (about 1,500 people), through the ONS Postcode Directory. The index combines income, employment, health, education, crime, housing and living environment; it ranks areas against each other and does not describe any one household. Ranks in England and Wales are worked out separately and cannot be compared.

What has changed

  • Food hygiene ratings Subway (restaurant/cafe/canteen, NN3 8JZ) newly listed: 5 Very good (rated 8 October 2026) found 30 October 2026

Everything that has changed on and near this street

Postcodes on this street

Source: ONS Postcode Directory August 2026, ONS UPRN Directory September 2026, OS Open Linked Identifiers September 2026. A postcode can cover more than one street; the share shows how many of its addresses are on this one.

Nearby streets

Charnwood Avenue · Moorland Close · Coaching Walk · Pyramid Close · Ashley Way · Spruce Court · Grassmere Avenue · Fir Tree Walk · Laurel Court · Conifer Rise · Gadesby Court · Tonmead Road

All the streets in NN3 and across West Northamptonshire.

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.
  • 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.