While I don't doubt you, isn't that unsafe? But let's move to what they install in cop cars and such. It's called a DVR and uses various cameras with anywhere from 100 to 1,000 GB of removable hard disk space. Given the HDDs run about 50 bucks you can pop new drives in and use some video editing to reduce the frames per second even lower than what the DVR offers.

Example at http://www.seondesign.com/dvrs/trooper-tl2.html

Such recorders can drop to 1 FPS and other settings depending on your need. There are too many cameras to list for such things.
Bob