What can impair your attention when driving through a tunnel?

Driving through a tunnel can present unique challenges that affect a driver's attention. In this scenario, the reflections of light from oncoming traffic can create visual distractions, making it harder to focus. Additionally, the length of the tunnel can alter perception, potentially causing drivers to lose concentration due to the monotonous environment.

Both of these factors are crucial to consider according to German traffic regulations because they emphasize the importance of maintaining optimal focus while driving in potentially dangerous situations like tunnels. Good road markings, while beneficial for navigation, do not significantly impair attention, which is why they were not included in the correct combination. Recognizing all relevant distractions helps ensure safety for all road users.