What benefits does the driver of a motor vehicle have by using a cruise control system?

The chosen options are accurate as they highlight the primary benefits of using a cruise control system in a motor vehicle.

Option 1 correctly states that the system maintains a constant pre-set speed on flat roads, which helps in fuel efficiency and reduces driver fatigue during long journeys.

Option 2 emphasizes that cruise control can make it easier for the driver by allowing them to take their foot off the accelerator, enhancing comfort on long drives.

However, it is important to note that option 3, which pertains to adjusting speed according to traffic density, is not a feature of traditional cruise control systems. German traffic regulations underscore the need for drivers to adapt their speed to traffic conditions, and while adaptive cruise control can do this, standard cruise control does not. Thus, understanding the full range of features helps in making informed decisions while driving, ensuring safety and compliance with traffic laws.