Like everyone else, I compulsively take a picture every time I cross a state line.
Maryland to Delaware, Highway 1.
Delaware to Maryland. I assume this is the state line, because the pavement stops. The dirt is actually packed sand, which I can't ride due to my tires. I could see a stop sign a half mile off. I walked it.
Maryland to the District of Columbia, Varnum St.
The District of Columbia to Virginia, I-66 on the Theodore Roosevelt Bridge
Virginia to North Carolina, on the Blue Ridge Parkway
North Carolina to Tennessee, US 321
Tennessee to Alabama, Natchez Trace Parkway
Alabama to Mississippi, Natchez Trace Parkway. Note Indian mound in background
Mississippi to Louisiana, US 65/84
Lousiana to Texas, LA SR 8/TX SR 63
Texas to New Mexico, Gardiner Road, El Paso County. I realized I entered Texas at the easternmost possible point, so I decided to leave it at the westernmost possible point. This picture is actually in New Mexico, the state line was unmarked because the road was so minor.
New Mexico to Arizona, SR 80.
Arizona to California, I-10 pedestrian bridge.