It makes sense to me that if it's trending downwards and towards safer transport, this may have played a role and we're just not quite sure how much.
To revisit your comment, Ms. Fox, about how being recorded can change the way a person behaves, your example about using a device when maybe you should be looking at the signal is well taken. Obviously that's hazardous behaviour. Is there a possibility that being recorded could actually change the way a person does their job in a negative way? I know sometimes in my previous career if I went out for lunch and chatted with friends over a beer, although I wasn't on the clock, I may have come up with a good idea that I put into practice, although it was against the office policy.
Is there any concern that it's going to change the behaviour of a person who might ordinarily be quite good at their job or that it could impact their ability to do it safely?