You are driving on a motorway at night in lane 1. Ahead, you see a very slow-moving agricultural tractor joining from the slip road, displaying an amber beacon and travelling at about 20 mph. What should happen in this situation according to the Highway Code?

Explanation

Highway Code Rule 253 states that certain slow-moving vehicles, including agricultural vehicles, MUST NOT use motorways. They may only be allowed in exceptional cases where special permission is granted, typically for oversized loads under controlled conditions. Tractors and similar slow agricultural vehicles are expected to use alternative routes, not to join or travel on motorways in normal circumstances.