Bryans Leap Burnopfield, County Durham
129 addresses across 10 postcodes (NE16), about 860 m (0.5 miles) long, classed as a local road. USRN 11005197.
- Sales: 95 recorded sales since 1995; in 2025 the median was £185,000 across 3 sales.
- Energy: 51 homes have an energy certificate (C: 8, D: 29, E: 14).
- Flood: 14 addresses on its postcodes are in areas 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 A; Band D in County Durham costs £2,622 a year in 2026-27.
- Broadband: Gigabit broadband is available to 0% of premises.
- Transport: The nearest railway station is Blaydon, about 6.7 km (4.1 miles) away in a straight line.
- Green space: The nearest park or garden is about 1.5 km (0.9 miles) away.
- Air: Background air pollution in 2024 was 5.9 µg/m³ of nitrogen dioxide and 5.4 of PM2.5, within UK legal limits.
- Height: Its addresses are 163 to 177 m above sea level.
- Noise: 20 of its 129 addresses are modelled at 55 dB or more from road traffic.
- Doctors: The nearest GP surgery is Cedars Medical Group, about 330 m away.
- People: About 960 people lived in the census areas around it in 2021; 87% of households owned their home and 36% of adults held a degree or other higher qualification.
- Crime: 41 crimes were recorded within 250 m between September 2025 and August 2026, most often shoplifting.
- Road safety: 1 collision in which someone was hurt was reported on and around it in 2021 to 2025; 1 involved a pedestrian.
£9.99 The Street Dossier Full Report for a home on Bryans Leap: its own records, questions to ask the seller and everything on this page, in one PDF. Choose the home
Sales on this street
| Year | Sales | Median price | Lowest | Highest |
|---|---|---|---|---|
| 2025 | 3 | £185,000 | £155,000 | £195,000 |
| 2024 | 2 | £183,000 | £167,500 | £198,500 |
| 2023 | 4 | £201,750 | £180,000 | £240,000 |
| 2022 | 1 | £285,000 | £285,000 | £285,000 |
| 2021 | 3 | £200,000 | £180,000 | £230,150 |
| 2020 | 2 | £207,500 | £185,000 | £230,000 |
| 2019 | 5 | £172,000 | £129,950 | £210,000 |
| 2018 | 5 | £160,000 | £111,000 | £178,000 |
| 2017 | 3 | £170,000 | £167,500 | £325,000 |
| 2016 | 2 | £163,750 | £142,500 | £185,000 |
| 2015 | 5 | £149,950 | £115,000 | £210,000 |
| 2014 | 4 | £150,500 | £20,000 | £184,950 |
| Date | Address | Type | Price | Notes |
|---|---|---|---|---|
| 21 Nov 2025 | 37 NE16 6BW | Semi-detached | £185,000 | |
| 18 Jul 2025 | 108 NE16 6BU | Semi-detached | £195,000 | |
| 21 Feb 2025 | 109 NE16 6BU | Semi-detached | £190,000 | Not a standard sale (repossession, buy-to-let or transfer). |
| 23 Jan 2025 | 30 NE16 6BW | Terraced | £155,000 | |
| 23 Aug 2024 | 83 NE16 6BT | Semi-detached | £198,500 | |
| 28 Mar 2024 | 83 NE16 6BT | Semi-detached | £177,500 | Not a standard sale (repossession, buy-to-let or transfer). |
| 11 Mar 2024 | 41 NE16 6BW | Semi-detached | £167,500 | |
| 22 Nov 2023 | 67 NE16 6BP | Detached | £205,000 | |
| 18 Oct 2023 | 102 NE16 6BU | Semi-detached | £180,000 | |
| 26 Jul 2023 | 80 NE16 6BT | Semi-detached | £198,500 | Leasehold. |
| 1 Jun 2023 | 2 NE16 6BL | Semi-detached | £240,000 | |
| 3 Sep 2022 | 71 NE16 6BS | Detached | £285,000 | |
| 21 Dec 2021 | 9 NE16 6BN | Semi-detached | £230,150 | |
| 28 May 2021 | 23 NE16 6BW | Other | £5,650 | Not a standard sale (repossession, buy-to-let or transfer). |
| 12 May 2021 | 8 NE16 6BN | Semi-detached | £180,000 | |
| 16 Apr 2021 | 20 NE16 6BW | Semi-detached | £200,000 | |
| 12 Feb 2021 | 80 NE16 6BT | Semi-detached | £120,000 | Leasehold. Not a standard sale (repossession, buy-to-let or transfer). |
| 31 Jul 2020 | 10 NE16 6BN | Semi-detached | £185,000 | |
| 3 Apr 2020 | 42 NE16 6BW | Detached | £230,000 | |
| 13 Dec 2019 | 37 NE16 6BW | Semi-detached | £189,500 | |
| 3 Oct 2019 | 83 NE16 6BT | Semi-detached | £129,950 | |
| 27 Sep 2019 | 35 NE16 6BW | Semi-detached | £210,000 | |
| 26 Sep 2019 | 110 NE16 6BU | Semi-detached | £172,000 | |
| 22 Jul 2019 | 37 NE16 6BW | Semi-detached | £136,000 | |
| 22 Mar 2019 | 37 NE16 6BW | Semi-detached | £94,000 | Not a standard sale (repossession, buy-to-let or transfer). |
| 18 Dec 2018 | 110 NE16 6BU | Semi-detached | £111,000 | |
| 23 Nov 2018 | 95 NE16 6BU | Semi-detached | £170,000 | |
| 5 Sep 2018 | 4 NE16 6BL | Semi-detached | £160,000 | |
| 26 Jun 2018 | 32 NE16 6BW | Semi-detached | £125,000 | |
| 24 May 2018 | 35 NE16 6BW | Semi-detached | £178,000 | |
| 7 Nov 2017 | 29 NE16 6BW | Semi-detached | £167,500 | Leasehold. |
| 31 Jul 2017 | 29 NE16 6BW | Other | £5,650 | Not a standard sale (repossession, buy-to-let or transfer). |
| 23 Jun 2017 | WOODHILLS NE16 6HH | Detached | £325,000 | |
| 12 Apr 2017 | 79 NE16 6BT | Semi-detached | £170,000 | |
| 6 Jul 2016 | 46 NE16 6BW | Semi-detached | £142,500 | |
| 30 Mar 2016 | 26 NE16 6BW | Detached | £185,000 | |
| 18 Dec 2015 | 78 NE16 6BS | Detached | £210,000 | |
| 21 Oct 2015 | 108 NE16 6BU | Semi-detached | £115,000 | |
| 3 Sep 2015 | 65 NE16 6BP | Semi-detached | £149,950 | Leasehold. |
| 20 Mar 2015 | 20 NE16 6BW | Semi-detached | £170,000 | |
| 20 Mar 2015 | 29 NE16 6BW | Semi-detached | £125,000 | Leasehold. |
| 29 Oct 2014 | 113 NE16 6BU | Semi-detached | £155,000 | Leasehold. |
| 29 May 2014 | 54 NE16 6BP | Detached | £20,000 | |
| 23 May 2014 | 9 NE16 6BN | Semi-detached | £184,950 | |
| 2 May 2014 | 79 NE16 6BT | Semi-detached | £146,000 | |
| 1 Nov 2013 | WILLOW COTTAGE, 5 NE16 6BL | Semi-detached | £325,000 | |
| 26 Jul 2013 | 38 NE16 6BW | Semi-detached | £125,000 | |
| 19 Mar 2013 | 1 NE16 6BL | Semi-detached | £120,000 | |
| 19 Oct 2012 | 96 NE16 6BX | Semi-detached | £212,000 | |
| 15 Dec 2011 | 105 NE16 6BU | Semi-detached | £143,000 |
Energy performance certificates
51 homes with a current certificate; median floor area 90 m². Most common: House, semi-detached (26); House, detached (12); Bungalow, semi-detached (8). Built: 1967-1975 (35); 1950-1966 (14); 2007 onwards (1). Tenure at assessment: owner-occupied (39); rented (private) (4); rented (social) (1).
Each home's certificates and sales (51 addresses)
- 1 Bryans Leap, Burnopfield
- 2 Bryans Leap, Burnopfield
- 3 Bryans Leap, Burnopfield
- 4, Bryans Leap, Burnopfield
- 8 Bryans Leap, Burnopfield
- 9, Bryans Leap, Burnopfield
- 10, Bryans Leap, Burnopfield
- 12, Bryans Leap, Burnopfield
- 19, Bryans Leap, Burnopfield
- 20, Bryans Leap, Burnopfield
- 22, Bryans Leap, Burnopfield
- 26, Bryans Leap, Burnopfield
- 29, Bryans Leap, Burnopfield
- 30 Bryans Leap, Burnopfield
- 31, Bryans Leap, Burnopfield
- 32, Bryans Leap, Burnopfield
- 33, Bryans Leap, Burnopfield
- 35, Bryans Leap, Burnopfield
- 37, Bryans Leap, Burnopfield
- 38 Bryans Leap, Burnopfield
- 41 Bryans Leap, Burnopfield
- 42, Bryans Leap, Burnopfield
- 46, Bryans Leap, Burnopfield
- 50, Bryans Leap, Burnopfield
- 54, Bryans Leap, Burnopfield
- 58 Bryans Leap, Burnopfield
- 60, Bryans Leap, Burnopfield
- 62, Bryans Leap, Burnopfield
- 65, Bryans Leap, Burnopfield
- 67 Bryans Leap, Burnopfield
- 69, Bryans Leap, Burnopfield
- 71 BRYANS LEAP, BURNOPFIELD
- 78, Bryans Leap, Burnopfield
- 79, Bryans Leap, Burnopfield
- 80 BRYANS LEAP, BURNOPFIELD
- 83, Bryans Leap, Burnopfield
- 94 Bryans Leap, Burnopfield
- 95, Bryans Leap, Burnopfield
- 96, Bryans Leap, Burnopfield
- 99 Bryans Leap, Burnopfield
- 101 Bryans Leap, Burnopfield
- 102 Bryans Leap, Burnopfield
- 105, Bryans Leap, Burnopfield
- 108, Bryans Leap, Burnopfield
- 109 BRYANS LEAP, BURNOPFIELD
- 110, Bryans Leap, Burnopfield
- 113, Bryans Leap, Burnopfield
- 121, Bryans Leap, Burnopfield
- The Vicarage, Bryans Leap, Burnopfield
- Willow Cottage, 5 Bryans Leap, Burnopfield
- Woodhills, Bryans Leap, Burnopfield
Council tax
What each band costs in County Durham in 2026-27: Band D £2,622 a year on average, including the police, fire and any county and parish charges.
| A | B | C | D | E | F | G | H |
|---|---|---|---|---|---|---|---|
| £1,748 | £2,039 | £2,331 | £2,622 | £3,205 | £3,788 | £4,370 | £5,244 |
Homes by band in the neighbourhoods around this street: most are in band A (33% of about 1,440 homes).
Planning and heritage
- Conservation area: yes, Burnopfield. Extensions, demolition, some windows and doors, and work on trees need consent.
- Listed buildings on or by this street: 2.
- 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.
Listed buildings
- 30 AND 32, FRONT STREET, grade II
- WALLS AND PIERS IN FRONT OF NUMBER 30 AND 32, grade II
Roadworks
Planned, as of 31 October 2026
- 30 October 2026 to 3 November 2026: BT, New service connection, give and take, on the footway, carriageway, verge (minor works)
Finished in the last three months
- 12 September 2026 to 16 September 2026: NORTHUMBRIAN WATER, Utility repair and maintenance works, no carriageway incursion, on the footpath (immediate - urgent works)
- 9 September 2026: BT, New service connection, no carriageway incursion, on the footpath (immediate - urgent works)
- 1 September 2026 to 15 September 2026: NORTHERN POWERGRID (NORTHEAST) PLC, Utility asset works, give and take, on the footway, carriageway, verge (major works)
- 13 July 2026 to 3 August 2026: NORTHERN GAS NETWORKS, Utility repair and maintenance works, give and take, on the footway, carriageway, verge, footpath (major works)
Flood risk
Rivers, the sea or surface water: in this street's postcodes, 9 addresses are in areas at high risk, 5 at medium risk and 10 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 |
|---|---|---|---|
| NE16 6BW | not in 2 or 3 | 0 / 0 / 0 | unlikely |
| NE16 6BU | not in 2 or 3 | 1 / 3 / 4 | unlikely |
| NE16 6BP | not in 2 or 3 | 1 / 0 / 3 | unlikely |
| NE16 6BN | not in 2 or 3 | 2 / 0 / 0 | unlikely |
| NE16 6BS | not in 2 or 3 | 0 / 0 / 0 | unlikely |
| NE16 6BT | not in 2 or 3 | 5 / 2 / 2 | unlikely |
| NE16 6BL | not in 2 or 3 | 0 / 0 / 1 | unlikely |
| NE16 6BX | not in 2 or 3 | 0 / 0 / 0 | unlikely |
| NE16 6HH | not in 2 or 3 | 0 / 0 / 0 | unlikely |
| NE16 6HQ | not in 2 or 3 | 0 / 0 / 0 | unlikely |
Height above sea level
The street's 129 addresses are between 163 m and 177 m above sea level (175 m on average); the ground rises about 15 m from the lowest to the highest.
Broadband
| Postcode | Superfast (30 Mbit/s+) | Ultrafast (300 Mbit/s+) | Gigabit | Below 10 Mbit/s |
|---|---|---|---|---|
| NE16 6BL | 100% | 0% | 0% | 0% |
| NE16 6BN | 100% | 0% | 0% | 0% |
| NE16 6BP | 100% | 0% | 0% | 0% |
| NE16 6BS | 100% | 0% | 0% | 0% |
| NE16 6BT | 100% | 0% | 0% | 0% |
| NE16 6BU | 100% | 0% | 0% | 0% |
| NE16 6BW | 100% | 0% | 0% | 0% |
| NE16 6BX | 83% | 0% | 0% | 0% |
| NE16 6HH | 100% | 0% | 0% | 0% |
| NE16 6HQ | 100% | 0% | 0% | 0% |
Getting around
| Nearest | Distance | |
|---|---|---|
| Railway stations | Blaydon 69,000 journeys in 2024–25 | 6.7 km (4.1 miles) |
| MetroCentre 632,000 journeys in 2024–25 | 7.3 km (4.5 miles) | |
| Dunston 51,000 journeys in 2024–25 | 7.7 km (4.8 miles) | |
| Bus stops | 6 stops within 400 m (0.2 miles), 26 within 800 m (0.5 miles); nearest Schools Burnopfield | 100 m |
| Bus or coach station | Tanfield Comprehensive School Tanfield Lea | 3.9 km (2.4 miles) |
| EV charging points | 1 within 1.6 km (1 mile); nearest Be.EV Charging Station | 1.5 km (0.9 miles) |
| Airport with scheduled flights | Newcastle International Airport NCL | 14.8 km (9.2 miles) |
Local services
| Nearest | Distance | |
|---|---|---|
| GP surgeries | 1 practices within 1.6 km (1 mile); nearest Cedars Medical Group | 330 m |
| Pharmacies | 2 pharmacies within 1.6 km (1 mile); nearest Caspian Health Limited | 330 m |
| NHS dentists | 3 practices within 1.6 km (1 mile); nearest Gibside Dental | 360 m |
| Hospital | South Moor Hospital | 6.3 km (3.9 miles) |
| Police station | Durham Constabulary - Catchgate Police Station | 4.8 km (3 miles) |
| Cash machines | 1 machines within 800 m (0.5 miles); nearest The Cooperative Food Burnopfield, Burnopfield | 200 m |
Parks and green space
| Nearest | Distance | |
|---|---|---|
| Park or garden | Unnamed 9,970 m² | 1.5 km (0.9 miles) |
| Play area | Unnamed 240 m² | 820 m (0.5 miles) |
| Playing field | 1 within 800 m (0.5 miles); nearest Unnamed 8,990 m² | 800 m (0.5 miles) |
| Allotments | 5 within 800 m (0.5 miles); nearest Unnamed 3,660 m² | 270 m |
Landmarks
The nearest historic landmark is Leap Mill Farmhouse and Aqueduct Wall, With Pigsty/Henhouse Attached, a listed building (Grade II*), 600 m (0.4 miles) north-east. 11 listed buildings are within 1 km (0.6 miles), 2 of them Grade II*.
| Name | What it is | From the middle of the street |
|---|---|---|
| Leap Mill Farmhouse and Aqueduct Wall, With Pigsty/Henhouse Attached | Listed building, Grade II* | 600 m (0.4 miles) north-east |
| Burnopfield House | Listed building, Grade II* | 720 m (0.4 miles) east |
| Friarside Chapel | Scheduled monument | 1.2 km (0.7 miles) north-west |
| Gibside | Registered park or garden, Grade I | 1.9 km (1.2 miles) north-east |
| Name | What it is | From the middle of the street |
|---|---|---|
| Black Hill | Hill | 520 m (0.3 miles) south |
| Scaife's Wood | Wood | 660 m (0.4 miles) north-west |
| Sheep Hill | Hill | 780 m (0.5 miles) east |
| Jockside Wood | Wood | 840 m (0.5 miles) north-west |
| Lintzhall Dene | Valley | 1.4 km (0.9 miles) south-west |
| Mill Stream | Lake or reservoir | 1.9 km (1.2 miles) west |
Air quality
| Pollutant | Here | UK limit | WHO guideline |
|---|---|---|---|
| Nitrogen dioxide (NO2) | 5.9 | 40 | 10 |
| Fine particles (PM2.5) | 5.4 | 20 | 5 |
| Particles (PM10) | 8.2 | 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 |
|---|---|---|
| 60 to 64 | 13 | 0 |
| 55 to 59 | 7 | 0 |
| Under 55 | 109 | 129 |
20 of the street's 129 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 County Durham: see them on the County Durham page.
Nearest schools
| School | Phase | Ages | Distance | Inspection |
|---|---|---|---|---|
| Burnopfield Primary School | Primary | 2–11 | 180 m | Report card (May 2026): Curriculum and teaching: Expected standard; Achievement: Expected standard; Attendance and behaviour: Expected standard; Personal development and wellbeing: Expected standard; Inclusion: Strong standard; Leadership and governance: Expected standard; Early years: Expected standard; Safeguarding standards: Met |
| Sacred Heart Catholic Primary School, Byermoor Roman Catholic | Primary | 4–11 | 1.8 km (1.1 miles) | Good (Jun 2024, overall grade under the previous framework) |
Food hygiene ratings nearby
| Business | Type | Distance | Rating | Rated |
|---|---|---|---|---|
| Messy Church NE16 6HR | Restaurant/Cafe/Canteen | 190 m | 5 Very good | 25 Oct 2023 |
| The Co-Operative Food NE16 6HR | Retailers - supermarkets/hypermarkets | 250 m | 5 Very good | 23 Jul 2026 |
| The Sun Inn NE16 6PU | Pub/bar/nightclub | 360 m | 5 Very good | 26 Aug 2026 |
| Premier - Leazes Convenience Store NE16 6JE | Retailers - other | 430 m (0.3 miles) | 4 Good | 30 May 2024 |
Crime within 250 m
| Category | Crimes |
|---|---|
| Shoplifting | 18 |
| Violence and sexual offences | 8 |
| Criminal damage and arson | 4 |
| Anti-social behaviour | 4 |
| Other crime | 2 |
| Vehicle crime | 2 |
| Drugs | 1 |
| Other theft | 1 |
| Public order | 1 |
Most of these are attached to: On or near Supermarket (23); On or near East View (8); On or near Poplar Avenue (4); On or near The Copse (2); On or near Laurel Terrace (2).
Road safety
1 collision in which someone was hurt was reported on and around the street in 2021 to 2025: 0 fatal, 0 serious and 1 slight. 1 involved a pedestrian; 1 involved a child under 16. Most were on roads with a 30 mph limit.
| Year | Collisions | Fatal or serious |
|---|---|---|
| 2021 | 1 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| Date | Severity | Who was hurt | Road | Conditions |
|---|---|---|---|---|
| 8 Sep 2021 08:10 | Slight | 1 person: 1 pedestrian, 1 child | B6310, 30 mph | Daylight |
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.
People and work
Who lives here
| Around this street | England | |
|---|---|---|
| Median age | 56 | 40 |
| Children under 15 | 10% | 17% |
| Aged 65 and over | 36% | 18% |
Homes
| Around this street | England | |
|---|---|---|
| Owned (outright or with a mortgage) | 87% | 61% |
| Owned outright | 56% | 33% |
| Shared ownership | 1% | 1% |
| Social rented | 2% | 17% |
| Private rented | 10% | 21% |
Work and commuting
| Around this street | England | |
|---|---|---|
| Adults (16 and over) in work | 47% | 57% |
| Unemployment (of those working or looking for work) | 4% | 6% |
| Retired (of adults) | 42% | 22% |
| Long-term sick or disabled (of adults) | 4% | 4% |
| Work mainly from home (of those in work) | 33% | 32% |
| Travel to work by car or van | 60% | 48% |
| By train, Underground, metro or tram | under 1% | 4% |
| By any public transport, including bus | 2% | 8% |
| On foot or by bicycle | 3% | 10% |
| Work within 10 km (6 miles) of home (of those who travel to work) | 44% | 65% |
| Work 30 km (19 miles) or more away | 12% | 8% |
Education and languages
| Around this street | England | |
|---|---|---|
| Degree or other higher qualification, Level 4+ (of adults) | 36% | 34% |
| No qualifications | 18% | 18% |
| Apprenticeship as highest qualification | 5% | 5% |
| Main language English (aged 3 and over) | 99% | 91% |
| Cannot speak English well or at all | under 1% | 2% |
Deprivation
The neighbourhoods around this street are all 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.
What has changed
- Roadworks Street works permit: BT: New service connection, 30 October 2026 to 3 November 2026 (give and take) found 3 November 2026
Postcodes on this street
- NE16 6BW: 30 addresses of 32 in the postcode
- NE16 6BU: 26 addresses
- NE16 6BP: 18 addresses
- NE16 6BN: 13 addresses
- NE16 6BS: 12 addresses
- NE16 6BT: 11 addresses
- NE16 6BL: 7 addresses
- NE16 6BX: 6 addresses of 9 in the postcode
- NE16 6HH: 4 addresses
- NE16 6HQ: 2 addresses of 3 in the postcode
Nearby streets
Valley View · The Leazes · Elm Grove · The Copse · East View · Birch Crescent · B6310 · Laurel Terrace · Birch Crescent · Poplar Avenue · Birch Crescent · Myrtle Grove
All the streets in NE16 and across County Durham.
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.