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Why is there so much road noise from my car?

My nearly three-year-old Vauxhall Astra seems noisy. The noise appears to be coming from the rear and varies depending on speed and road surface. Could the reason be the tyres or wheel bearings?

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It could be either. If a wheel bearing it would usually be just one of them. Jack each back wheel half an inch off the ground and try to pull it in and out to see if there is any movement. If there is, that's the wheel bearing that is failing. If there isn't on either then it's probably tyre wear.
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