My car's tyres make an intermittent thumping noise. Is this a serious problem?

It depends.

Inspect the tyres to see if you can spot a bulge.

If a tyre is bulging, you need to replace it.

Bulging is a serious condition because the tyre can blow out at high speeds.

It is a sign that the inner reinforcements of the tyre wall have given way.

Automobile Association of Singapore

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