Get the re-alignment kits for your headlights.
Make sure you have the required safety bits and pieces, see [broken link removed] and
here. Think Halfords stock cheap breathalysers that will do the job.
Plenty of speed cameras on the autoroute, and they don't advertise their presence. Also, it is illegal to use any device that can warn you of the location of cameras, either fixed or mobile, with fines of up to €1500, though not sure how much that is enforced.