The relatively small decline in road travel compared to air travel could be pegged to lower gasoline prices, running nearly 30 percent below a year ago, according to AAA.

• 美国汽车协会认为，乘汽车旅行的人数降幅相对较小，可能是由于汽油价格下滑，目前汽油价格较一年前挫跌了近30%25。（完）