M5 road noise: how it affects nearby properties
The M5 runs from Birmingham down to the South West, carrying both heavy commuter traffic around Bristol and intense seasonal holiday flows towards Devon and Cornwall. For homes near the M5, that seasonal pattern matters: a road that feels manageable in winter can become markedly busier on summer weekends, so the typical annual picture and the peak picture can differ.
Traffic on the M5: what the 2025 DfT counts show
Annual averages smooth out a road that fills on summer weekends, and the M5 is that kind of road, so the median of 94,000 vehicles a day is a baseline rather than a peak. Across 55 count points, 48 exceed fifty thousand, 23 exceed one hundred thousand and 4 are under ten thousand, the lowest being 4,685, probably a link or slip road. The lower quartile is 83,200, the upper quartile 110,100 and the top tenth begins at 126,300. The single busiest point records 150,612. All are two way, year average counts.
Near Oldbury the M5 runs as an elevated dual three-lane section on concrete pillars over canals before it reaches the M6, and J1 to J2 there is the only stretch with a 60 mph air-quality limit. Heading south-west, the 24 points in the north-eastern third sit around 96,700 and include the top reading, 150,612. The 19 in the middle rise to about 101,700, and the 12 in the south-western third ease to about 84,100. In the Gordano Valley the carriageways split and climb the hills, with the Wynhol Viaduct opened in January 1973.
Lorry shares on the M5 vary widely: the median is 9.5 per cent and the busiest tenth of points sees 11.8, but the highest reaches 22, against a lowest of 2.6. That top figure stands out. Heavy vehicles contribute a deep rumble that travels further than car noise, so a home near a point at that level has a different noise mix from one at the median.
| Quarter of points carry under | 83,200 vehicles/day |
|---|---|
| Median point | 94,000 vehicles/day |
| Three-quarters carry under | 110,100 vehicles/day |
| Busiest tenth carry over | 126,300 vehicles/day |
| Busiest single point | 150,612 vehicles/day |
The M5 on the ground
- The M5 runs about 163 miles from M6 J8 at West Bromwich to J31 south of Exeter; the Exminster section opened on 27 May 1977. en.wikipedia.org
- M5 J1 to J2 at Oldbury is the only M5 stretch with a 60 mph air-quality limit, which stays while the legal removal process continues. nationalhighways.co.uk
- J4a (Bromsgrove) to J6 (Worcester) was upgraded between January 2015 and June 2017 with an extra lane each way, new emergency areas and low-noise resurfacing. vgcgroup.co.uk
- In the Gordano Valley between J19 and J20 the M5 uses split-level carriageways climbing the hills, with the Wynhol Viaduct opened in January 1973. en.wikipedia.org
- The M5 opened in sections: J4-J8 on 20 July 1962, Filton Bypass (J16-17) in May 1963, and Avonmouth to Portbury (J18-19) in May 1974. roads.org.uk
- National Highways replaced the central barrier at M5 J23 near Bridgwater with steel beam barriers in November-December 2025, with 50 mph limits during works. puriton-pc.gov.uk
- Near Oldbury the M5 runs as an elevated dual three-lane section on concrete pillars over canals before reaching the M6. en.wikipedia.org
How loud is the M5, and how fast does it fall away?
Imagine open, flat ground and nothing screening a house from the M5. The median flow of 94,000 vehicles a day lands at 81 dB at the 20 m mark, 78 at 50 m, 75 at 100 m and 72 at 200 m. The busier flow of 126,300 gives 82, 79, 76 and 74. Speed is taken as 70 mph with 9.5 per cent lorries. These compare with the Defra reporting line of 55 dB Lden and the WHO guideline of 53 dB, both of which are lower than every figure listed. Embankments, viaducts and valleys will move any real address away from them.
| Flow | 20 m | 50 m | 100 m | 200 m |
|---|---|---|---|---|
| Typical section (94,000 vehicles/day) | 81 | 78 | 75 | 72 |
| Busiest tenth of sections (126,300+ vehicles/day) | 82 | 79 | 76 | 74 |
Areas near the M5
Passing through: West Midlands · Worcestershire · Gloucestershire · Somerset · Devon.
Around Bristol and the West Midlands the M5 runs close to dense housing and often on embankment, offering little natural screening, while the southern Somerset and Devon stretches pass through more open country. Properties near Bromsgrove, Worcester and the Bristol fringe frequently sit within Defra-mapped noise contours, which AcoustaPlot reads directly for your address before falling back to a terrain-aware calculation elsewhere.
Recent on the M5
Between junction 4a (Bromsgrove) and junction 6 (Worcester), the M5 is an “all lane running” smart motorway that opened on 26 May 2016, with the hard shoulder permanently converted into a traffic lane and 14 emergency refuge areas added.
How AcoustaPLOT assesses M5 noise for your property
On a motorway running from the West Midlands to Devon, the sensible start is the nearest measurement. For an M5 address, AcoustaPlot goes through the 55 count points on this road and keeps one if it is within 8 km along the carriageway, adopting the daily flow and lorry share logged there. The real distance, terrain, ground, buildings or barriers, and other roads and rail follow, which matters where the M5 climbs hillsides or sits on embankment. It reports the day-evening-night (Lden) and night-time (Lnight) levels at your facade, and reads Defra's mapped value for any railway noise where available.
Check my property near the M5 →
M5 noise: common questions
How does the Gordano Valley section of the M5 shape noise?
Between J19 and J20 the M5 uses split-level carriageways that climb the hills, with the Wynhol Viaduct opened in January 1973. Sloping ground and carriageways at different heights make a flat ground table a rough guide only. The terrain data is what lets an address there be assessed rather than assumed.
Is the 60 mph limit near Oldbury permanent?
The J1 to J2 stretch at Oldbury is the only part of the M5 with a 60 mph air-quality limit, which stays in place while the legal removal process continues. The table on this page assumes 70 mph, so it is not a model of that limit, and the carriageway there is elevated on concrete pillars over canals.
Did the J4a to J6 upgrade include any noise measures?
Between January 2015 and June 2017 the stretch from Bromsgrove to Worcester gained an extra lane each way, new emergency areas and low-noise resurfacing. The resurfacing is a noise measure, but the indicative table does not model surface type, and the effect at any particular address would depend on its distance and surroundings.
What were the J23 barrier works near Bridgwater?
National Highways replaced the central barrier at M5 J23 with steel beam barriers in November and December 2025, with 50 mph limits during the works. They were a temporary matter for traffic speeds, and the counts on this page describe how the road normally runs, not the period when the limits applied.