Final answer:
Ensure the entire truck's cab is visible in your rearview mirror before pulling in front after passing to stay out of blind spots and provide safe stopping distance.
Step-by-step explanation:
When passing a big truck, make sure you can see the entire truck's cab in your rearview mirror before pulling in front. It is essential for safety on the road as trucks have larger blind spots than smaller vehicles. Not seeing the full cab could mean you are in the truck's blind spot, increasing the risk of an accident. Additionally, trucks need more time to slow down, so ensuring sufficient space allows for safer lane changes for both you and the truck driver.