You're riding in a car on a four lane highway the driver of your car decides to pull ahead of the car in the right lane to get ready to exit your car speeds up and you observe the car to the right fall behind what type of reference frame produces this kind of observed motion.
The type of reference frame that produces this kind of observed motion is a non-inertial reference frame. In this scenario, the car you are riding in accelerates and pulls ahead of the car in the right lane. As a result, the car in the right lane appears to fall behind relative to your car.
