After stopping at a railroad crossing, when may you proceed?
a.After counting to ten
b.As soon as you open the door
c.After honking your horn twice
d.Only when you are sure no train is approaching and you can clear the tracks completely
Explanation
You may proceed across the tracks only after you have opened the door, looked and listened in both directions, and confirmed no train is approaching and that there is room to completely clear the tracks on the other side.
