Earlier today I was traveling on the Interstate going about 80mph in a 70mph zone. I came across a bridge with two people on it. Not noticing what was going on, I passed under the bridge, then I saw a flash like a camera, except it was a big box kind of thing?

I was assuming this was some kind of speed thing where they send the ticket to my house.
What do you think? I might be wrong

Can't tell. Generally cameras are used for running red lights, not speeding.

Have never heard of a "speed" camera and not on a "bridge"
My guess this has nothing to do with speeding.