Our Gross National Product, about $357 billion in 1954, is estimated to reach over $500 billion in 1965 when our population will exceed 180 million and, according to other estimates, will travel in 81 million vehicles 814 billion vehicle miles that year. Unless the present rate of highway improvement and development is increased, existing traffic jams only faintly foreshadow those of ten years hence. What does the underlined phrase mean? have not been well understood are less serious than those of the past are minor compared to those of the future have not received the attention they deserve Item Code: 922460317