It only just occurred to me why, as British drivers with the steering wheel on the right side, we thought that the repeater lights were such a good idea: To us the lights are just outside the driver's window, almost in touching distance - very useful!

Incidentally, they are also used in Guadeloupe and presumably other French colonies. It amused me to see people arriving on Air France flights with dogs on Leads: What happens if they have a dogfight at 20,000 feet?...and do the air hostesses have pooper scoopers?