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For somebody else's streets we don't like these cameras. >> exactly. >> what's going on in iowa? >> in iowa what happened is in 2008 the supreme court came down and said that the cities can erect these red light cameras and these speeding cameras. and then what happened is the city of sioux city put up all these cameras. now the department of transportation has come in unilaterally -- bear in mind, they're not a legislative body. and they crafted these new regulations that says now to the city of sioux city you've got to take these down unless you can meet certain criteria to show that there's...

The earliest. in cases like the ones in which you have been involved in cases like this, typically what happens? typically who is to blame? what is to blame? pilot error? mechanical failures? things like that. >> sure. each crash is different. >> sure. >> factually and causatively and so there is no set answer. if you look at it statistically, certainly pilot error seems to be a predominant factor. but what is important i think in every analysis of a plane crash and particularly commercial plane crashes like these that are very complicated are the chain of events that lead up to it. it is not ...

In addition, there are pins up and down both sides of the door. normally all of this holds the door shut. in the case of united flight 811, something goes horribly wrong. >> forensic analysis of the door indicated that there was actually a short circuit. >> it's an electrical problem that had caused unexpectedly a command to unlock the door, to actually come open. so that it was a design issue. >> finding that cargo door was critical to answering this question. >> it was so critical that the ntsb actually reissued the report with a different and more up to date cause as well as causing all 747...

Then for further reinforcement a handle moves l-shaped arms up against the c-latches to keep them in place. in addition, there are pins up and down both sides of the door. normally all of this holds the door shut. in the case of united flight 811, something goes horribly wrong. >> forensic analysis of the door indicated that there was actually a short circuit. >> it's an electrical problem that had caused unexpectedly a command to unlock the door, to actually come open. so that it was a design issue. >> finding that cargo door was critical to answering this question, obviously. >> it was so cr...

Actually come open. so that it was a design issue. >> finding that cargo door was critical to answering this question, obviously. >> it was so critical that the ntsb actually reissued the report with a different and more up to date cause as well as causing all 747s to be redesigned to prevent this kind of failure from occurring again. it was a case where the industry learned a very valuable lesson. >> the final cause, according to the ntsb, faulty wiring that allowed the properly closed door to unlatch, some time between the closing of the door and takeoff. in other words, it happened on the g...