Honestly, you see this all over the world where anticipated development either hasn't materialised or funds have dried up. The A57(M) freeway through Manchester, England was planned to continue from its current endpoint southwards, but the rest of it... never happened. And now there's a bridge over the A34 that doesn't connect to anywhere.

As I recall, the M1 emerging from London starts at "Junction 4" and there were three more junctions planned deeper into central London, but that part of the road never happened either.