[userbinator]

It wouldn't surprise me if the new system turns out to be less reliable and not last as long, due to all these added things. This isn't aerospace-level, but it's still an application where bugs can be truly dangerous (e.g. bridge attempts to open while you're driving across?)

http://en.wikipedia.org/wiki/Second-system_effect

[koenigdavidmj]

We actually have relevant history of that in Seattle. The 520 bridge opened whilst traffic was running back in the 80s, killing one.