Highways we would've called implausible, impossible, or not needed

[epzik8]

I-97 in Anne Arundel County between Baltimore and Annapolis, because the Maryland Route 10 Arundel Expressway was supposed to be that Baltimore-Annapolis freeway thoroughfare, and replace Ritchie Highway. Then they decided that the MD-3 Glen Burnie Bypass needed upgrades and an extension. That's how I-97 came to be. They chose that corridor to go out to U.S. 50/301 at Annapolis instead of MD-10, which as a result only goes out to MD-100 around Pasadena. I-97 has made Glen Burnie's Business MD-3 useless.

[dfwmapper]

A little late to this, but I'll bring up "every iteration of the road linking Yuma with San Diego". The original plank road across the dunes, the first paved road winding through the mountains, then building a full freeway through there.

[cpzilliacus]

I-97 in Anne Arundel County between Baltimore and Annapolis, because the Maryland Route 10 Arundel Expressway was supposed to be that Baltimore-Annapolis freeway thoroughfare, and replace Ritchie Highway. Then they decided that the MD-3 Glen Burnie Bypass needed upgrades and an extension. That's how I-97 came to be. They chose that corridor to go out to U.S. 50/301 at Annapolis instead of MD-10, which as a result only goes out to MD-100 around Pasadena. I-97 has made Glen Burnie's Business MD-3 useless.

It was also about not running the Arundel Freeway (Md. 10) through Severna Park and other communities on the Broad Neck between U.S. 50/U.S. 301 and Pasadena, a distance of about 9 straight-line miles (since Md. 2 (Ritchie Highway) is literally arrow-straight here) from the southern terminus of Md. 10 and

[Buffaboy]

I-86 (E) from Erie to Jamestown.