就安全性而言，駕駛員在駕車的同時又操作車用電腦，其視覺的負荷是非常高的，造成因不能專心於道路情況而導致意外的發生。為了解決上述的問題，第一步驟就是發展整合式多媒體中央控制介面以解決行車安全的問題與車內介面配置的空間節省，而整合式多媒體中央控制介面則以階層式的選單設計來呈現。用來評量介面設計之優劣的重要標準，就是測量其安全駕車績效，在此研究之安全駕車績效則是考量駕車視線偏移時間，因為操作介面而造成的視線偏移之建議值是低於一點二秒。此外，透過這次的研究，觸控螢幕與三按鍵的按鈕組，將被作為何種操作方式是較適合於車用電腦輸入裝置之比較。
一組原創性的車用電腦控制與顯示介面被建立來分析其相關績效。整體而言，觸控螢幕操作方式在各種績效值上優於按鈕組的操作方式，且人們在道路為高視覺需求的清況下，又必須操作車用電腦，會更有機會導致事故的發生。最後一點，行進在彎曲的路況時，應避免使用按鈕系統，因為轉動方向盤與按鈕的動作是互相妨礙的。

In terms of safety, E-Car applications could be too visually demanding, distracting drivers from the road. It easily leads to traffic accident. In order to solve the overload problem of visual demand and to avoid traffic accident, integrating multimedia console interface is the first step to solve the problem and to save the usage of space. Then, it is also necessary to apply hierarchical menu structure which we emphasize right here. The polestar of the console menu design can reduce mean glance time (watching away from the driving scene to the secondary function interface in E-Car) as possible as we can. The mean glance time is expected and preferred to be lower than 1.2 seconds. Furthermore, through experiments, the operation methods of the touch screen and a three buttons set (enter, back, and escape) attaching on the steering wheel were compared to find out a better control design in E-Car.
An original touch screen and a button set operation system of integrated interface in E-Car are constructed, and one can obtain some results from analyzing statistical data after finishing the experiment: Generally speaking, the operation mode of touch screen is better than the operation mode of button set. Besides, visual demand could represent the difficult degree of driving conditions. One has to operate the device of vehicle, the secondary tasks, with the higher visual demand and the more risk of accident could be happened. Finally, one outcome is unexpectedly found that button-pressing motion and wheel-steering motion are restrained from each other while driving and operating button set at the same time.

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