 The airport's main runway lies directly north of the highway, with low-flying planes making their final approach over SR 531, and the complex is ringed by a gravel multiuse trail.The highway crosses another set of railroad tracks and the Centennial Trail at 67th Avenue, which continues into downtown Arlington.From the crossing, SR 531 begins its ascent up a hill, curving to the north along the edge of the Gleneagle housing development and golf course.