Road & rail noise map for Horley
Town in Surrey, South East
We analysed 1,075 postcodes in and around Horley, Surrey against DEFRA's Strategic Noise Mapping (Round 4, 2022). 25% of them (269) have mapped road noise of 55 dB or more by day, and 5% have mapped rail noise. 71% 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 RH6 7HL (road noise 70.0–74.9 dB by day).
Noise map of Horley
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 | 18% (195) | 6% (60) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | 5% (58) | 3% (35) |
| 65.0–69.9 dB day · 60.0–64.9 dB night | 1% (15) | <1% (7) |
| 70.0–74.9 dB day · 65.0–69.9 dB night | <1% (1) | 0% (0) |
| 75.0 dB or more day · 70.0 dB or more night | 0% (0) | 0% (0) |
| Below mapped bands / not mapped | 75% | 91% |
Rail noise
| Band | Day (LAeq,16h) | Night (Lnight) |
|---|---|---|
| 55.0–59.9 dB day · 50.0–54.9 dB night | 3% (28) | 2% (25) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | 2% (22) | 2% (24) |
| 65.0–69.9 dB day · 60.0–64.9 dB night | <1% (7) | <1% (5) |
| 70.0–74.9 dB day · 65.0–69.9 dB night | 0% (0) | <1% (1) |
| 75.0 dB or more day · 70.0 dB or more night | 0% (0) | 0% (0) |
| Below mapped bands / not mapped | 95% | 95% |
Share of the 1,075 postcodes within ~5 km of the Horley centre. Source: DEFRA Strategic Noise Mapping Round 4 (2022), Open Government Licence.
Noisiest postcodes in and around Horley
Check a specific postcode
Example searches: RH6 7HL · RH6 7AP · RH10 3JB · RH10 3YJ · RH6 0AB · RH11 0PH
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 Horley?
- We analysed 1,075 postcodes in and around Horley, Surrey against DEFRA's Strategic Noise Mapping (Round 4, 2022). 25% of them (269) have mapped road noise of 55 dB or more by day, and 5% have mapped rail noise. 71% 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 RH6 7HL (road noise 70.0–74.9 dB by day).
- Where is the most road noise in Horley?
- The postcodes with the highest modelled daytime levels in and around Horley are RH6 7HL, RH6 7DA, RH6 7HH, based on DEFRA's 2022 model of major roads and railways.