Many of the roads, bridges and transit systems we travel on each day were built decades ago, paid for by previous generations. Many facilities have outlasted their original design and are in dire need of repair, or need to be completely rebuilt. The wear and tear we put on these existing systems is huge. We are a significantly more prosperous and highly mobile society compared the to the road usage when these facilities were built.
To date travel for 2013 changed by -0.1% (-1.4 billion vehicle miles). The Cumulative estimate for the year is 1,461.7 billion vehicle miles of travel.