Final answer:
When driving on a freeway entrance ramp, you should look for a gap in freeway traffic by looking in your mirrors and turning your head to look over your shoulder.
Step-by-step explanation:
When driving on a freeway entrance ramp, you should look for a gap in freeway traffic by looking in your mirrors and turning your head to look over your shoulder. This method allows you to check for any vehicles approaching from both the rear and the sides, which can help you determine if it's safe to merge onto the freeway.