A3 road noise: how it affects nearby properties
The A3 is a major dual carriageway from London to Portsmouth and carries motorway-level traffic through much of Surrey and Hampshire, despite being an A-road. Many attractive villages sit close to it, and the Defra strategic noise maps do cover its busiest stretches — so AcoustaPlot can often read a mapped value directly for A3-adjacent homes.
Traffic on the A3
Typically 60,000–90,000 vehicles a day on its Surrey dual-carriageway sections. Traffic volume, HGV proportion and speed all influence how much noise reaches nearby homes. As a major A-road, the A3 can carry motorway-level flows on its busiest sections while being much quieter elsewhere.
Areas near the A3
Passing through: Greater London · Surrey · Hampshire.
The Hindhead Tunnel dramatically reduced noise for the Devil's Punch Bowl area, a reminder of how much infrastructure shapes local conditions. Elsewhere, homes near Guildford, Ripley and Cobham can sit close to high flows. AcoustaPlot distinguishes between mapped and calculated sections so you know exactly how your A3 estimate was derived.
How AcoustaPLOT assesses A3 noise for your property
AcoustaPLOT geocodes your property, identifies the nearest carriageway of the A3, and estimates the daytime (Lden) and night-time (Lnight) levels at your facade — reading Defra's mapped value where available, or calculating it from DfT traffic data with real elevation data elsewhere.
Check my property near the A3 →
A3 noise: common questions
How much noise does the A3 make?
It depends on your distance from the carriageway, the traffic flow and the terrain in between. Typically 60,000–90,000 vehicles a day on its Surrey dual-carriageway sections AcoustaPLOT estimates the daytime and night-time level at your specific facade rather than quoting a single figure for the whole road.
Can a fence or barrier reduce A3 noise?
Often, yes. A well-placed barrier breaks the line of sight to the traffic and forces the sound to bend over the top, which costs it energy (insertion loss, per ISO 9613-2). Height, length and position all matter — the first two metres usually do most of the work.
Is a property near the A3 a bad buy?
Not necessarily — exposure varies enormously over a short distance, and terrain or existing screening can make a big difference. The only way to know is to check the exact address rather than the road as a whole.