Bridge Week Riddle #2, Tuesday, March 6

In old times made with twisted grass,

Now large waters you can pass.

I come with two towers tall

Ready for shifting and shaking, y’all.

Light as a bridge can be,

Some long as the eye can see.

I have suspenders but no pants,

Curvy cables (if I must rant).

Solve this riddle you can…

With a trip out to old San Fran!