Road & rail noise map for Southwick
Town in West Sussex, South East
We analysed 1,121 postcodes in and around Southwick, West Sussex against DEFRA's Strategic Noise Mapping (Round 4, 2022). 28% of them (312) have mapped road noise of 55 dB or more by day, and 2% 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 BN41 1XW (road noise 70.0–74.9 dB by day).
Noise map of Southwick
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 | 13% (151) | 10% (107) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | 10% (110) | 7% (80) |
| 65.0–69.9 dB day · 60.0–64.9 dB night | 4% (47) | 2% (20) |
| 70.0–74.9 dB day · 65.0–69.9 dB night | <1% (4) | <1% (2) |
| 75.0 dB or more day · 70.0 dB or more night | 0% (0) | 0% (0) |
| Below mapped bands / not mapped | 72% | 81% |
Rail noise
| Band | Day (LAeq,16h) | Night (Lnight) |
|---|---|---|
| 55.0–59.9 dB day · 50.0–54.9 dB night | 1% (16) | 1% (12) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | <1% (2) | <1% (2) |
| 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 | 98% | 99% |
Share of the 1,121 postcodes within ~5 km of the Southwick centre. Source: DEFRA Strategic Noise Mapping Round 4 (2022), Open Government Licence.
Noisiest postcodes in and around Southwick
Check a specific postcode
Example searches: BN42 4ED · BN43 6RS · BN41 1PH · BN41 1XW · BN3 4QT · BN3 4QW
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 Southwick?
- We analysed 1,121 postcodes in and around Southwick, West Sussex against DEFRA's Strategic Noise Mapping (Round 4, 2022). 28% of them (312) have mapped road noise of 55 dB or more by day, and 2% 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 BN41 1XW (road noise 70.0–74.9 dB by day).
- Where is the most road noise in Southwick?
- The postcodes with the highest modelled daytime levels in and around Southwick are BN41 1XW, BN41 1PH, BN43 6RS, based on DEFRA's 2022 model of major roads and railways.