Final answer:
To pass another car safely at speeds of 45 mph, you should signal and change lanes to pass the car.
Step-by-step explanation:
In order to pass another car safely at speeds of 45 mph, you should signal and change lanes to pass the car. Changing lanes allows you to create a safe distance between your car and the car you are passing. This way, you can safely overtake the car without increasing your speed dramatically or waiting for the car to move out of your way.