What are the drawbacks of running on the highway with an on-demand four-wheel drive system?

[Mark]

On-demand four-wheel drive systems have the following drawbacks when running on the highway: Lower safety performance: Most on-demand four-wheel drive systems are limited by structural flaws when transferring power between the front and rear axles, unable to deliver more than 50% of the power to the rear axle, resulting in incomplete power utilization. The front and rear axles of on-demand four-wheel drive systems generally use open differentials. In complex road conditions where two wheels on one side lose traction, the vehicle may struggle to free itself. The active safety of on-demand four-wheel drive vehicles is not as high as that of full-time four-wheel drive vehicles. Limited adjustment range: When transferring power, it cannot deliver more than 50% of the power to the rear wheels, and the adjustment range is not as wide as that of full-time four-wheel drive systems. Compared to part-time four-wheel drive systems, the physical limits of on-demand four-wheel drive are lower in harsh road conditions.