Final answer:
The blind spot of a semi truck can extend up to 200 feet behind the truck, and it's important for drivers to be aware and avoid these areas to ensure road safety.
Step-by-step explanation:
Blind spots are areas around the vehicle that the driver cannot see through their mirrors. For semi trucks, these areas are particularly large due to the truck's size.
It is crucial for other drivers to be aware of these blind spots to avoid being in them, as the truck driver may not see them when making turns, changing lanes, or stopping. Therefore, when driving near semi trucks, it's important to stay out of these blind spots and make sure you can see the truck's mirrors. If you can't see the truck driver's reflection, they likely can't see you either.