2.11 Table below gives data on the urban and rural federal-aid highways (in thousand miles) as reported by the U.S. Census Bureau’s Statistical Abstract of the United States (2001). Federal-aid highways are the highways constructed using funding from the federal government.

a Construct time series plots for urban and rural highways.
b Compare and comment on any trends observed.

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Year Urban Rural 1980 624 3331 1985 691 3171 1990 757 3123 1993 803 3102 1994 814 3093 1995 814 3093 1996 834 3100 1997 843 3116 1998 842 3065