SR 243 heads north as a six-lane divided highway through a cloverleaf interchange with I-66 just east of the Vienna station of the Washington Metro, which is the western terminus of the Orange Line that runs in the median of the Interstate from Vienna east to Arlington.
SR 243, a six-lane divided highway, connects to I-66 at a cloverleaf interchange near the Vienna Metro station, which serves as the western endpoint of the Orange Line, running through the median of I-66 between Vienna and Arlington.