When you are passing a large truck, you need to make sure you can see a lot of pavement in front of the truck before you pull back in front of it?

Explanation:

While driving on the road we should be alert and cautious at every point of driving. We should also follow the basic traffic rules for ours as well as others safety.  So when passing by a large truck, we should make sure that we see a lot of the pavement area in front of the truck so that we are aware of the fact that there is enough space in front of the truck for us to apply brake and halt our car incase if there is any danger ahead. And also if the truck happens to stop suddenly, we get enough space to stop for our safety. Also to see if there is any obstacles ahead so that we do not hit the obstacle and meet with accidents.  

c. magnitude and direction