Have more faith in European engineering and regulation, it's something we excel at :-)

There are 9 grades of lighting, ranging from that required on a motorway interchange, through urban motorways, rural motorways, major roads, etc, to residential areas.

Here's the relevant standard: http://vili.pmmf.hu/~mate/oktatas/VilTech_levelez%F5/EN13201... (BS = British Standard, but EN = European Norm, so the British Standard implements the European Standard. [I think that's how it works.])

This is the code of practise for Britain: http://persona.uk.com/orga46newark/ha_docs/disposit_docs/dd1...

The "Manual for Streets" has an overview, from p120: https://www.gov.uk/government/uploads/system/uploads/attachm...

(Similar documents should exist for every EU country, but the British ones are in English and easiest to find with Google.)