LOL at the giant sail they created in the rendering. Some civil engineer is smacking his head on a table right now.

No comment in this article about the increased sheer forces adding turbines would introduce? Bridges are built to withstand winds of a certain strength with their given side profile. If you add turbines would the bridge not be subject to considerably higher forces?
I think it is a good idea but I doubt you could retrofit many bridges.

We had a railroad bridge near here for years that stood the test of time until it was decided to restore it. Part of that process involved putting huge tarps on the side of the thing (to cover construction/work) that vastly increased the lateral wind forces it had to endure and it blew over.
I'm sure the company doing the work denies responsibility but it stood for like 100 years to blow over (sideways) the week tarps were added.
Bridges are generally pretty expensive objects. It's probably cheaper to just build stand alone windmills than to reinforce/design high bridges to endure these extra forces.

And the coolest part is how the birds that get chopped up will simply fall into the river below and get washed away.
No need to count endangered species- WIN,WIN!

I would expect the solid panels to increase the wind loading on the bridge pylons. a gimbaled assembly with an open frame would probably do much better, and weigh less!

I don't think that 0.25 mw would power 400 homes. Maybe a small community of 10 or so. IF the bridge is designed for the windmills, structurally, it should work in theory. In my opinion, I have seen too many wind farms with turbines that are not turning due to not being properly aimed, or just due to no maintenance after the tax benefits end . What we should use are horizontal turbines that will be pushed by the wind no matter what direction it is blowing and that would work with the bridge system that has no way of changing what direction the turbines are aimed.

If you are asking then no, the mixed frequency harmonics of just the traffic, and turbines is a bad combination. Already having to deal with the wind forces, and traffic loads is enough to result in many bridges failing, not to mention earthquakes, land slides, and many other unpredictable natural forces.
It also concerns me that you have to ask.

Way to much dangerous sheet-metal windage in this artist's conception. As well, any sideways forces (wind resistance) generated by the face of the blades and/or spinning of one or more wind turbines would have to be carefully calculated or catastrophic failure of the bridge supports could easily occur. On the bright side: many bridges span natural venturi-like ground formations so one would expect ample wind velocity when the wind is, in fact, blowing. Ideally, engineers would also allow for high wind speeds to be captured with lower amperage and faster turning micro-turbines.

You'd have a more reliable power source if you put turbines in the rivers these bridges are spanning

Are bridge-mounted wind turbines a viable option?
https://silberzahnjones.files.wordpress.com/2012/06/bad-engineering-disaster-tacoma-narrows-bridge-collapse.jpg