Large vehicles have large blind spots, which can easily hide a car. When driving past such a vehicle, the golden rule is – if you can’t see the driver in the offside mirror, then they cannot see you.
To counter this, when travelling on multilane roads such as motorways, you should always pass a larger vehicle as quickly as you can. This blind spot is made worse when the vehicle is left-hand drive, and there are many such vehicles on UK roads. Often a sign on the back of the vehicle will alert you to this fact.
A second blind spot to beware of is where a car will be hidden from view when travelling too closely behind a large vehicle. The rule here is that if you can’t see the vehicle’s side mirrors, then the driver can’t see you.