SR 172 heads east as a four-lane divided highway on the highway named for Alan Shepard, the first American in space. The state highway meets the northern end of Armistead Avenue, which leads to the main entrance of Langley Air Force Base, as it curves to the north.
SR 172, a four-lane divided highway, runs east on the highway named after Alan Shepard, the first American in space. It intersects with Armistead Avenue, which leads to the main entrance of Langley Air Force Base, as it curves north.