Why can't a person lie down in a car with a width of 1.8 meters?

[Furtado]

The reason why a person cannot lie down in a car with a width of 1.8 meters is that the actual interior width is less than 1.8 meters. Here are the relevant explanations: 1. Definition of car width: Car width is the distance between two planes parallel to the vehicle's longitudinal symmetry plane and respectively touching the fixed protruding parts on both sides of the vehicle. Simply put, it is the distance between the two extreme points in the width direction of the car. 2. Advantages of a wider body: The benefit of a wider car body is that passengers sitting in the back row will not feel crowded, greatly improving riding comfort. However, excessive width will reduce the convenience of driving and parking in urban areas. The generally recognized upper limit for the width of a sedan is 2 meters.