What is the reason for the difference in fuel consumption between national highways and expressways?

[KaiRose]

The reason for the difference in fuel consumption between national highways and expressways is that the speed at which a car travels on a national highway differs from that on an expressway, leading to variations in fuel consumption rates. Overview of vehicle speed: Vehicle speed refers to the distance a car travels per unit of time, commonly referred to as speed, with units typically expressed in kilometers per hour or meters per second. Vehicle speed is one of the three parameters used to describe traffic flow and holds significant importance in traffic flow theory research. Classification of vehicle speed: Vehicle speed can also broadly refer to motor vehicle speed. To accommodate different purposes, vehicle speed is mainly categorized into spot speed, segment speed, and design speed. Spot speed is the instantaneous speed of a vehicle passing a specific point on the road. Design speed is the speed established to determine the design indicators of various geometric elements of the road and to ensure their coordination.