Final answer:
Large vehicles at high speeds primarily create air turbulence at the rear end, which is the most significant due to the airflow separation causing a wake. Additionally, while accelerating, a car also experiences increased air resistance contributing to turbulence. Sides of vehicles are also affected, especially when vehicles pass each other closely.
Step-by-step explanation:
Large vehicles traveling at high speeds create air turbulence mostly in the rear of the vehicle. Air flows around the body of the vehicle, and as it reaches the rear, it separates from the surface creating a region of chaotic air flow, known as a wake. This turbulence can also affect the sides and to some extent, the underside of the vehicle. However, it is the rear where the most significant turbulence is generated due to the air flow not being able to follow the sharp angles and curves, resulting in a wake. A similar effect happens when a car is accelerating while driving, where the car experiences increased air resistance contributing to turbulence. Additionally, a scenario like a car passing a truck can lead to air flowing in a narrower channel between the two vehicles, causing pressure differences that can push the vehicles together, contributing to the air turbulence experienced on the side of the vehicle.