The most critical thing to do before you pass another vehicle is:
a. check to the rear
b. to the left side
c. check ahead
d. check to the right side

The most critical thing to do before you pass another vehicle is: check to the right side. Correct D It is also very important never to drive faster than the the speed limit, or at a speed that is unsafe for the current traffic, weather or road condition in order to pass other vehicles. The law requires you to only pass other vehicles on the left (using the left lane). This is why you should check the right side.