Why should you drive slower at night?

Question

Question: Why should you drive slower at night?

Options:

1.  There are more careless drivers on the road at night
2.  You are more apt to get sleepy
3.  There is more traffic on the roads
4.  The distance which you can see ahead is less

Answer 1

4. The distance which you can see ahead is less

You should drive slower at night because the distance which you can see ahead is less.