Eastbound at the 6th St. Bridge. The Purple Belt, unlike the Red through Green Belts, is signed by the town with this unique (and clearly town-erected) signage. The belts are concentric by color of the rainbow, so red is the outermost and blue is the innermost, and the city's Purple Belt is nestled deep downtown. Some of the Belts meet each other and even multiplex, but they never cross.
Penn Ave. WB at 11th St. at the east end of Fort Duquesne Blvd. (to the right). This is the closest Pittsburgh comes to Philadelphia-style signage.
11th St. SB just past the end of Fort Duquesne Blvd. EB. I didn't see another ALT. 380 shield, and it seems that if this route ever officially existed, it's dead now. Up on the railroad overpass past Smallman St. is the old clearance sign and the remnants of what appeared to be a red circle. That may have been a red Pennsylvania RR keystone inside the circle, since the Pittsburgh, Fort Wayne, and Chicago Railway was part of the Penn. RR system.
Onto the boulevard WB, where the same railroad curves to cross the road again and then head across the Allegheny River, and under the David L. Lawrence Convention Center. Up ahead are the 9th, 7th, and 6th St. Bridges, the "Three Sisters" because they look the same and were all built in the 1920's.
Click to drive Fort Duquesne Blvd. westbound from the last traffic light onto the I-279 Fort Duquesne Bridge. This is technically the "10th St. Bypass", even though it doesn't begin until west of 10th St. It was the route of PA 380 Alternate but there are no shields left. Fort Duquesne Blvd. itself technically continues on the surface (the opposite direction of the first two photos on this page), but I'm including the video here in all its patched concrete glory.