M2 road noise: how it affects nearby properties
The M2 runs through Kent from the outskirts of London towards Canterbury and the coast, crossing the Medway and carrying a heavy mix of commuter and Channel-bound freight traffic. Because lorry noise is lower-pitched and travels further than car noise, the freight character of the M2 often makes night-time levels the deciding factor for the many homes near its Medway Towns sections.
Traffic on the M2: what the 2025 DfT counts show
The M2 is the shorter road, about 25 miles, and its 21 count points reflect it: 14 carry more than fifty thousand vehicles a day, 4 carry more than a hundred thousand, and none falls below ten thousand. The lowest reading is 22,985, the lower quarter is under 40,700, the median is about 61,400 and the upper quarter starts at 84,200. All but the top tenth are under 101,500, and the highest reading is 103,004. That top value is the notable one: the M2 has no spike far above the rest, so the difference between a quiet and a busy spot is mostly a matter of position along its length.
Which end of the M2 are you asking about? From the north-west, at Strood near Three Crutches, the first third has 9 count points, a median of 87,600 vehicles a day and the road's peak of 103,004. This is where it was widened to four lanes towards Chatham and three to Gillingham, with a second Medway Bridge built beside the original. The middle third, 7 points, is lighter, at a median of 41,000, as the road climbs to about 600 ft near Bredhurst through deep chalk cuttings and embankments. The last third, 5 points, has a median of 59,800 on the run to Faversham, where it has two lanes each way.
The M2 carries a narrow band of lorries. The median count point records 8.6% heavy goods vehicles, while the heavier tenth of count points sit above 9%, 9.8% at the highest and 3.9% at the lowest. Because the range is tight, flow and ground height, not lorry share, drive most of the difference between M2 addresses. Lorry noise is lower-pitched and carries further than car noise, so even this moderate share is carried into the calculation from a count point on the M2 itself.
| Quarter of points carry under | 40,700 vehicles/day |
|---|---|
| Median point | 61,400 vehicles/day |
| Three-quarters carry under | 84,200 vehicles/day |
| Busiest tenth carry over | 101,500 vehicles/day |
| Busiest single point | 103,004 vehicles/day |
The M2 on the ground
- The M2 is about 25 miles long, leaving the A2 near Three Crutches at Strood and rejoining it near Faversham. roads.org.uk
- It opened in three sections during 1963: Park Pale to Stockbury on 29 May, then on to Perry Court and Brenley Corner by 3 September. roads.org.uk
- The Medway Bridge is prestressed concrete with a 500 ft main span; with approaches it measures nearly two-thirds of a mile. roads.org.uk
- The road climbs to about 600 ft near Bredhurst through deep chalk cuttings and embankments, with Stockbury Valley viaduct carrying it 70 ft above ground. roads.org.uk
- Early-2000s works widened the road to four lanes towards Chatham and three to Gillingham, and added a second Medway Bridge beside the original. roads.org.uk
- East of Stockbury the M2 has two lanes each way through to Faversham and Brenley Corner. roads.org.uk
- The junction 5 upgrade at Stockbury, begun June 2021, added a flyover and A249 slip roads, with flint-faced design to suit the Kent Downs setting. highwaysmagazine.co.uk
- A taller replacement barrier on the Medway Bridge foot and cycle path was completed on 22 March 2024. highwaysengland.co.uk
How loud is the M2, and how fast does it fall away?
Take away the viaduct, the cuttings and the Medway Towns streets and the M2 is simply flat ground with a motorway on it, which is what this table describes. A typical flow of about 61,400 vehicles a day gives 79 dB Lden at 20 m from the nearest carriageway, falling to 71 dB by the time you reach 200 m, with 76 dB at 50 m and 73 dB at 100 m. A busy section of around 101,500 gives 81 dB close in and 73 dB at 200 m, with 78 and 75 between. The real M2 is not flat, though. The Stockbury Valley viaduct carries it 70 ft above ground and deep cuttings take it below the surrounding land, so an actual address may sit well above or below these values.
| Flow | 20 m | 50 m | 100 m | 200 m |
|---|---|---|---|---|
| Typical section (61,400 vehicles/day) | 79 | 76 | 73 | 71 |
| Busiest tenth of sections (101,500+ vehicles/day) | 81 | 78 | 75 | 73 |
Areas near the M2
Passing through: Kent.
Housing across the Medway conurbation — Rochester, Chatham and Gillingham — sits close to the route, and the Medway viaduct raises the noise line above local screening for some properties. AcoustaPlot calculates a terrain-aware road level for your address, distinguishing the exposed viaduct-side homes from those sheltered by cutting or distance.
Recent on the M2
Junction 5 of the M2, the Stockbury interchange with the A249, was rebuilt under Road Investment Strategy 2 with a new flyover and two new slip roads — completed and opened in February 2025.
Source: https://www.newcivilengineer.com/latest/100m-overhaul-of-m2-junction-5-in-kent-completed-06-02-2025/
How AcoustaPLOT assesses M2 noise for your property
The M2 is short, with 21 DfT count points, so an address is matched to the nearest M2 point along the road if it lies within 8 km, and that point's volume and lorry percentage start the calculation. What makes the M2 interesting to model is the structure: a long prestressed concrete bridge over the Medway, a viaduct 70 ft above ground, and chalk cuttings and embankments on the climb. Real distance, ground height, buildings, barriers and other roads or rail are layered on top. 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 M2 →
M2 noise: common questions
How high is the Stockbury Valley viaduct, and does that matter?
The Stockbury Valley viaduct carries the M2 70 ft above ground. A raised road lifts the noise line above local screening, so homes on the viaduct side can be more exposed than ones sheltered by a cutting or by distance. The open-ground table cannot show this, which is why an M2 address needs its terrain checked rather than the road-wide figure applied.
Does the M2 really climb to 600 ft near Bredhurst?
Yes, the road climbs to about 600 ft near Bredhurst through deep chalk cuttings and embankments. That mix is the reason two houses at the same distance from the carriageway can hear different levels: one may look across an embankment, the other down into a cutting. The middle third of the M2 has the lightest median, 41,000 vehicles a day.
Is the Medway Bridge end busier than the Faversham end?
On the measurements, yes. The north-western third, from Strood past the Medway Bridge, has a median of 87,600 vehicles a day and a peak of 103,004, against 59,800 in the eastern third. The Medway Bridge is prestressed concrete with a 500 ft main span, and with approaches measures nearly two-thirds of a mile.
What was built at M2 junction 5, Stockbury?
The junction 5 upgrade at Stockbury, begun in June 2021, added a flyover and A249 slip roads, with flint-faced design to suit the Kent Downs setting. It opened in February 2025. East of Stockbury the M2 has two lanes each way through to Faversham and Brenley Corner, and the eastern third of count points has a median of 59,800 vehicles a day.