Originally Posted by
LapLap
That's a thank you to Dr Groggy! ^
I thought of posting a link, but didn't as I was unsure as to whether people from outside the UK could view iplayer content.
OK, thank you,
Dr Groggy, for the link

. I believe iPlayer content can only be viewed in the UK.
Originally Posted by
Dr Groggy
it is stated that in Japan speed camera pictures alone cannot be used for prosecuting infringements - and that a picture of the driver would be required for that purpose.
Is this true? If so, how does the system work at night?
I've done some google searches and it seems to be true. (Can't find anything in English so far...)
Speed cameras (called "Orbis" in Japan) are only triggered when the speed of a vehicle exceeds the limit by more than 30km/h on ordinary roads and 40km/h on expressways. Very powerful infrared flashes are used at night and also sometimes during the day as a warning to drivers. Apparently pictures are surprising clear but if a photograph of the driver is not good enough they don't bother to send a summon as it would be difficult to prove who the driver was.