Explanation: Trailers and caravans may be left in storage over the winter months, and tyres can deteriorate. It's important to check their tread depth and also their pressures and general condition. The legal tread depth of 1.6 mm applies to the central three-quarters of a tyre's breadth, over its entire circumference.
Category: Safety and your vehicle
References: The official DVSA guide to driving: section 14, Highway code: page 129