I can't find Ode Magazine's shot, but I found this proposal which shows how they would be used:
http://www.fastcodes...oadkill-problem
I saw this one at treehugger.com that was built in Ontario, Canada:

I am fascinated by this idea. I'm always saddened when a deer or other wild animal gets on the road. You know it isn't going to end well in most cases. To factor in a way for them to get by safely is so cool!
Do you have these where you live? I have never seen one in California, but that doesn't mean they don't exist here. I think it would be beneficial since we have many main highways that cut through wildlife regions. In the SF Bay Area, human and animal habitat intermingle in many places. There are places these bridges would save lives.