## 5 Discussion
### The Impact of Occupation Type on Dialogue Preferences  
The occupational background largely shapes drivers' dialogue needs and preferences in the context of fatigue driving. This difference stems not only from the nature of the driving tasks themselves but is also closely related to the long-term work pressure, social environment, and contextual factors experienced by the drivers. This study found that the occupational type significantly influences drivers' interaction patterns with voice assistants, reflected in differences in dialogue content, functional demands, and interaction styles. However, current research in this field remains limited, particularly regarding the exploration of the underlying psychological mechanisms behind these occupational differences.  
For long-haul freight drivers, their work is characterized by prolonged, monotonous, and high-intensity driving tasks, often accompanied by significant time pressure and feelings of loneliness [44]. This high cognitive load and low-social-interaction driving context make them more inclined to task-oriented voice interactions when fatigued, such as navigation, traffic information alerts, and fatigue warnings. These functional dialogues not only fulfill their need for information but also help maintain attention and reduce feelings of fatigue. However, this study further found that after driving continuously for a certain period--especially during nighttime--these drivers also exhibit a need for light social interactions, such as simple Q&A or casual chatting, which may serve as a coping strategy against prolonged social isolation and cognitive depletion.  
Taxi and rideshare drivers, on the other hand, operate in a different typical context. They frequently navigate complex urban traffic environments and engage in frequent interactions with passengers. Although this occupational group also faces serious fatigue issues [45], their social load is relatively higher, which shapes their preference for voice interactions that emphasize social and emotional regulation functions. Research shows that this group is more receptive to voice content with an affiliative or social nature, such as casual weather chats, friendly greetings, or discussions about daily life, and they even hope that voice assistants can simulate a \"companionship-style\" dialogue. This demand reflects their psychological need for emotional buffering after intense social work, with voice interactions serving as an alternative form of social engagement that helps release emotions and alleviate fatigue.  
In contrast, private car owners exhibit more diverse driving behaviors and contexts, and their reliance on voice assistants is relatively lower. Most private car owners have limited daily driving time, typically for commuting, shopping, or leisure trips, with work-related stress mainly stemming from balancing their life pace and family roles [46]. In such relatively relaxed driving scenarios, voice interactions tend to be more entertainment- and emotion-support oriented, such as playing music, delivering news broadcasts, or providing voice reminders related to family communication. They prefer low-intensity, non-task-oriented dialogue content to alleviate commuting fatigue and create a relaxed atmosphere.