Final Answer:
The high-range gears of a cargo truck are primarily utilized for highway driving, offering optimal fuel efficiency and maintaining higher speeds during transportation on open roads.
Step-by-step explanation:
Cargo trucks typically have multiple gears, including high-range gears designed for specific driving conditions. The high-range gears are particularly suited for highway driving, where the emphasis is on sustaining constant speeds over long distances. These gears allow the truck to operate efficiently at higher speeds, contributing to better fuel economy during highway travel.
In contrast, low-range gears are employed for tasks like climbing steep gradients or navigating challenging terrain where increased torque is essential. The versatility in gear selection enables cargo truck drivers to adapt to varying driving conditions, ensuring optimal performance and efficiency.