Why can fitness to drive be impaired even by just a small quantity of alcohol?

Your answer is correct because both options you've chosen are significant factors in how alcohol affects driving ability.

1. Reduced field of vision means a driver may not see important details in their environment, such as other vehicles or pedestrians. This is crucial for making safe driving decisions.

2. Diminished spatial vision affects a driver's ability to judge distances and speeds correctly, which can lead to errors in lane changes, merging, or stopping distances.

According to German traffic regulations, even a small amount of alcohol can impair these visual functions, increasing the risk of accidents. Therefore, understanding that both vision reduction and spatial perception are affected emphasizes the importance of remaining completely sober while driving. It's crucial to recognize all factors that contribute to impairment to promote road safety effectively.