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What the Writer Says…
CU30 is the DVLA endorsement code for using a vehicle with defective tyre(s). It falls under Section 41A of the Road Traffic Act 1988, read with the Road Vehicles (Construction and Use) Regulations 1986. The legal minimum tread depth in the UK is 1.6mm across the central three-quarters of the tyre, around the full circumference.
What makes CU30 particularly significant for insurance is the points-per-tyre rule. Each defective tyre carries 3 penalty points and a separate fine of up to £2,500 (or £5,000 for goods vehicles). A car with four defective tyres could mean 12 points and fines of up to £10,000 from a single roadside stop.
– Susan Difford, Insurance Expert &



