A display apparatus has a liquid crystal display having a display panel, a housing, a circulating fan, and an air conditioner. The method includes the following steps. The other is mounted adjacent to the door in the surrounding frame. A graphical map of the road system is then created and the traffic flow data representing traffic conditions on the road system is displayed on the graphical map, wherein the graphical map includes the geographical location of the user-selected object of interest. The method may further include modifying an operating condition of the power source if the parameter is above the threshold, where modifying the operating condition affects the parameter.