Road & rail noise map for Truro
City in Cornwall, South West
We analysed 1,140 postcodes in and around Truro, Cornwall against DEFRA's Strategic Noise Mapping (Round 4, 2022). 17% of them (191) have mapped road noise of 55 dB or more by day, and <1% have mapped rail noise. 83% of postcodes have no mapped road or rail noise at all — though that reflects major-source modelling, not guaranteed quiet. The highest modelled level we found is at TR4 9AF (road noise 70.0–74.9 dB by day).
Noise map of Truro
How many postcodes are affected?
Road noise
| Band | Day (LAeq,16h) | Night (Lnight) |
|---|---|---|
| 55.0–59.9 dB day · 50.0–54.9 dB night | 10% (118) | 5% (60) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | 5% (55) | 3% (36) |
| 65.0–69.9 dB day · 60.0–64.9 dB night | 1% (16) | 1% (12) |
| 70.0–74.9 dB day · 65.0–69.9 dB night | <1% (2) | 0% (0) |
| 75.0 dB or more day · 70.0 dB or more night | 0% (0) | 0% (0) |
| Below mapped bands / not mapped | 83% | 91% |
Rail noise
| Band | Day (LAeq,16h) | Night (Lnight) |
|---|---|---|
| 55.0–59.9 dB day · 50.0–54.9 dB night | <1% (7) | <1% (5) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | <1% (1) | 0% (0) |
| 65.0–69.9 dB day · 60.0–64.9 dB night | 0% (0) | 0% (0) |
| 70.0–74.9 dB day · 65.0–69.9 dB night | 0% (0) | 0% (0) |
| 75.0 dB or more day · 70.0 dB or more night | 0% (0) | 0% (0) |
| Below mapped bands / not mapped | 99% | 100% |
Share of the 1,140 postcodes within ~5 km of the Truro centre. Source: DEFRA Strategic Noise Mapping Round 4 (2022), Open Government Licence.
Noisiest postcodes in and around Truro
Check a specific postcode
Example searches: TR4 9AF · TR1 1NW · TR1 1SE · TR1 1NN · TR1 1PX · TR1 1ER
What this data does — and doesn't — cover
- Modelled, not measured.These are DEFRA's computer-modelled estimates (Round 4, 2022), not microphone readings at your door.
- Major sources only. The model covers major roads, major railways and large urban areas. Smaller local roads, neighbours, pubs, building sites and aircraft are not included.
- No mapped noise ≠ quiet. If a location shows no band, it means it falls outside the mapped contours — not that it is silent.
- 2022 snapshot.New roads, developments or traffic changes since 2022 won't show. The next DEFRA round is due around 2027.
More detail on the methodology page.
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Nearby areas
Frequently asked questions
- How noisy is Truro?
- We analysed 1,140 postcodes in and around Truro, Cornwall against DEFRA's Strategic Noise Mapping (Round 4, 2022). 17% of them (191) have mapped road noise of 55 dB or more by day, and <1% have mapped rail noise. 83% of postcodes have no mapped road or rail noise at all — though that reflects major-source modelling, not guaranteed quiet. The highest modelled level we found is at TR4 9AF (road noise 70.0–74.9 dB by day).
- Where is the most road noise in Truro?
- The postcodes with the highest modelled daytime levels in and around Truro are TR4 9AF, TR1 1NW, TR2 4BL, based on DEFRA's 2022 model of major roads and railways.