Why should you have the traffic information switched on, when driving on the motorway?

Your answer is correct because having traffic information switched on while driving on the motorway helps improve safety and trip planning. Specifically, it gives warnings about motorists heading in the wrong direction, which is a rare but very dangerous situation you need to be alerted to immediately. Additionally, it provides reports about traffic jams, allowing you to anticipate delays and possibly choose alternative routes. This real-time information helps you drive more safely and avoid unnecessary congestion. The option that traffic information is a prescribed requirement is incorrect; it is recommended but not legally mandatory.