It is quite common to hear about small cameras that some cyclists and also car drivers use to record the surrounding traffic. In case of a road accident or otherwise very blatant violation of the road traffic code, they expect such a video to be part of the evidence.
However I also heard that because of the new privacy laws basically no cameras are allowed on public places.
How to these approaches agree? Are these safety recording cameras just a violation or can they be used if solely for the accident reporting?
If this is something country specific, Switzerland is the most interesting but EU in general would probably substitute.