Question: What is the population of the town at the intersection of Interstate Highways 77 and  the longest Interstate highway within the borders of Virginia?

<P0-S0> Interstate 85 (I-85) is a part of the Interstate Highway System that runs from Montgomery, Alabama to Petersburg, Virginia. <P0-S1>  In Virginia, the Interstate Highway runs 68.64 mi from the North Carolina state line near Bracey north to I-95 in Petersburg. <P0-S2>  I-85 passes through the eastern part of Southside Virginia, where it parallels U.S. Route 1 (US 1) from Petersburg, where the highway runs concurrently with US 460, to south of South Hill, where the highway intersects Southside's major east–west highway, US 58. <P0-S3>  The Interstate Highway is the primary connection between the Richmond–Petersburg metropolitan area and the Research Triangle and other major metropolitan areas of North Carolina. <P0-S4>  Like all mainline Interstate Highways, I-85 is a part of the National Highway System for its entire length in Virginia. <SEP> <P1-S0> Interstate 81 (I-81) is an 855 mi highway. <P1-S1>  In the U.S. state of Virginia, I-81 runs for 324.92 mi , making the portion in Virginia longer than any other state's portion. <P1-S2>  It is also the longest Interstate highway within the borders of Virginia. <P1-S3>  It stretches from the Tennessee state line near Bristol to the West Virginia state line near Winchester. <SEP> <P2-S0> Wytheville ( ) is a town in, and the county seat of, Wythe County, Virginia, United States. <P2-S1>  It is named after George Wythe, a signer of the United States Declaration of Independence, and mentor to Thomas Jefferson. <P2-S2>  Wytheville's population was 8,211 at the 2010 census. <P2-S3>  Located at the intersection of Interstate Highways 77 and 81, the town has long been a crossroads for travelers. <P2-S4>  During the American Civil War, Wytheville had a strategic importance, and was attacked in 1863 (Toland's Raid) and 1865 (Stoneman's 1865 Raid). <P2-S5>  The town is also the birthplace of Edith Bolling Wilson, wife of President Woodrow Wilson. <SEP> <P3-S0> The following is a list of Interstate Highways in Maryland. <P3-S1>  There are currently 16 Interstate Highways that exist entirely or partially in the U.S. state of Maryland. <P3-S2>  Six of these are primary Interstates while ten are auxiliary Interstates related to one of the primary Interstates. <P3-S3>  The longest primary Interstate in Maryland is Interstate 95 (commonly abbreviated I-95) at 110.01 mi . <P3-S4>  The shortest primary Interstate in Maryland is I-81 at 12.08 mi . <P3-S5>  I-97 is the shortest primary Interstate at 17.62 mi and the shortest intrastate Interstate. <P3-S6>  I-97 is also the only primary Interstate to be located entirely within one county and to not connect with any other primary Interstate. <P3-S7>  The longest auxiliary Interstate in Maryland is I-695 at 51.48 mi . <P3-S8>  The shortest auxiliary Interstate in Maryland is I-295 at 0.80 mi . <P3-S9>  All Interstates are maintained by the Maryland State Highway Administration except for all of I-395, all of I-895, a small part of I-695, I-95 within and north of Baltimore, and I-83 within Baltimore. <P3-S10>  Maryland has one unsigned Interstate, I-595; that highway is marked as U.S. Route 50 and US 301, which are concurrent with I-595 for its entire length. <P3-S11>  Maryland has one former Interstate, I-170, which is shaded in dark gray in the list.