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Hi there. Newbie I am. My query is, what is the best source of power supply to front screen traffic camera for 2021 Kadjar. I don't want to plumb the fuse box. I have 2 X USBs and a lighter socket. Do these power  supplies switch off with the ignition(or a short time after)? Thanks

I think fusebox is best for a permanent fixture. Others will be able to help you better than me

Answered you other question then saw this one.
yes all the sockets will follow the ignition, they stay on until the drivers door is opened or when they time out after a short period smarter the ignition is turned off.
if you require permanent power then a simple add a fuse, fuse holder will work, just use a mm essential fuse location when fitting ie avoid ecu power supplies