You are driving in the middle lane of a busy three‑lane motorway and want to move into the right‑hand lane to overtake. Traffic in the right‑hand lane is moving slightly faster than you. What is the safest way to change lanes?

Explanation

The Highway Code, Rule 133, states that if you need to change lane you must first use your mirrors and, if necessary, take a quick sideways glance to make sure you will not force another road user to change course or speed. When it is safe, you should then signal to indicate your intentions and move over only when the lane is clear. Option A follows this sequence correctly. The other options either rely on other drivers to react, fail to check properly, or omit clear signalling, which is unsafe and contrary to Rule 133.