To quote Mark McQueen:  "There is nothing similar"  in a bridge and a tunnel.  Really?  We worry for you, Mr. McQueen.  You might mistaken a ferry ride for, say, root canal.

 We ask:  When is a fixed-link passageway (a tunnel) not a fixed-link passageway (a bridge)?  Perhaps when it is an abandoned ferry terminal we offer.    We see his confusion.

 Could it be the elevators and moving sidewalks that have contributed to this disorganized thinking that a tunnel cannot be a fixed link if its side walks are in movement? 

 Thanks for the laugh, but you TPA people are deeply silly.

Skywatcher