What can impair your attention when driving through a tunnel?

Your answer is correct because both reflections of light from oncoming traffic and the length of the tunnel can impair your attention while driving. In German traffic rules, light reflections can cause glare or distraction, making it harder to focus on the road. Additionally, long tunnels can lead to sensory deprivation or fatigue, reducing alertness. Good road markings, however, help guide drivers and do not impair attention, which is why only options 1 and 2 are relevant. Understanding these factors helps you stay alert and drive safely through tunnels.