I don't know of any in north Dallas. There are some pedestrian tunnels downtown Dallas near the end of the DART Rail.
The first thing that came to mind was Sprint Valley at 75 but that is for automobile traffic.
Forget all that, just did quick google search.
The Fountain Place apparently has a pedestrian tunnel.
Quote:
Fountain Place
Address: 1445 Ross Avenue
Dallas, Texas 75202
Submarket: Dallas, Central Business District
Location: Fountain Place is a downtown landmark, located on the highly accessible and visible northern edge of Dallas' central business district. With direct access to Woodall Rodgers Freeway and the Dallas North Tollway, Fountain Place is minutes from all major highways, Love Field and DFW International Airport. Pedestrian tunnels connect to The Fairmont Hotel and other downtown office buildings while the West End Historic District and Dallas Arts District are just two blocks away
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