Core Viewpoint - The use of NOA (Navigation on Autopilot) has been increasingly restricted on highways due to concerns over safety and 5G signal limitations, leading to a significant reduction in its availability for drivers [2][5][6]. Group 1: NOA Usage and Restrictions - Many drivers have reported a decrease in the availability of NOA on highways, with one driver noting that out of a 438-kilometer journey, only 68 kilometers allowed for NOA usage [2][4]. - The limitations on NOA usage are attributed to 5G signal issues rather than direct restrictions from car manufacturers or highway management [5][6]. - There is a growing concern among drivers regarding the safety of using NOA, especially after several accidents involving improper use of the system [6][7]. Group 2: Driver Behavior and Safety Concerns - Reports indicate that many drivers misuse NOA by becoming overly reliant on the system, leading to dangerous situations such as not paying attention while driving [6][7]. - A significant increase in accidents related to smart driving systems has been noted, with a 217% year-on-year rise in incidents involving driver over-reliance on these systems [7]. - Experts emphasize the importance of driver responsibility and the need for a balance between convenience and safety in the use of autonomous driving features [8][9]. Group 3: Industry Perspectives and Future Directions - Industry experts suggest that the current state of NOA and similar systems requires significant improvement, with calls for better integration of safety measures and technology advancements [8][9]. - The development of autonomous driving technology is seen as a complex challenge, requiring a combination of data-driven approaches and regulatory frameworks to ensure safety [8][9]. - There is a consensus that future advancements in smart driving must prioritize safety and the understanding of human behavior in conjunction with technological capabilities [9].

Core Viewpoint - The use of NOA (Navigation on Autopilot) has been significantly restricted on highways, with only 68 kilometers of a 438-kilometer journey being usable, attributed to 5G signal limitations rather than direct restrictions from car manufacturers or highway authorities [1][2][5]. Group 1: NOA Usage and Limitations - Many drivers have reported a decrease in the availability of NOA on highways, with specific instances of it being downgraded to LCC (Lane Centering Control) or being completely unusable [2][4]. - The NOA system, which is a higher-level driving assistance feature, is often misused, leading to accidents and raising concerns about its safe deployment [4][7]. - There is speculation that traffic management authorities may have flagged certain road segments as hazardous, prompting car manufacturers to optimize NOA usage [5][7]. Group 2: Signal Issues and Responsibility - Car manufacturers, including Li Auto, have stated that they have not imposed restrictions on NOA usage, suggesting that external factors like 5G signal quality may be influencing its functionality [5][6]. - Highway staff have indicated that signal coverage issues could be a reason for NOA's limited use, rather than any restrictions imposed by the highways themselves [6][11]. Group 3: Safety Concerns and Driver Behavior - The rise in accidents related to the misuse of driving assistance systems has led to increased caution among drivers, with many opting to use simpler systems like ACC (Adaptive Cruise Control) instead of NOA [8][11]. - Reports indicate that a significant percentage of accidents involving driving assistance systems are due to drivers over-relying on these technologies, highlighting the need for responsible usage [11][12]. - Experts emphasize that drivers must remain engaged and aware while using assistance systems, as reliance on technology can lead to dangerous situations [10][12]. Group 4: Future Development and Industry Insights - The industry is urged to balance the convenience of driving assistance with safety, advocating for a deeper understanding of the interactions between humans, vehicles, and road systems [14]. - There is a call for the development of a robust support system that integrates advanced vehicle technology with traffic infrastructure to enhance the safety and effectiveness of driving assistance systems [14].