OK volks... there is no such thing as a separate city light system on a
vehicle - parking lights are the same as city lights and it is not legal
to use them alone in a city anywhere in Europe now or any ECE complying
country. 

Source:
http://en.wikipedia.org/wiki/Front_position_lamps#Front_position_lamps_.28parking_lamps.29

Front

Front
position lamps (parking lamps)

Nighttime standing-vehicle conspicuity to the front is provided by
front position lamps, known as parking
lamps or parking lights in North America,
front sidelights in UK English, and in other regions as
position lamps, standing lamps, or
city lights. Despite the UK term, these are not the same
as the sidemarker lights described below. The front position
lamps may emit white or amber light in North America; elsewhere in the
world they must emit only white light. The city light terminology
for front position lamps comes from the now obsolete practice, formerly
adhered to in cities like Moscow, London and Paris, of driving at night in
built-up areas using these low-intensity
lights rather than headlamps. It is now illegal in most countries to drive
a vehicle with parking lamps illuminated, unless the headlamps are also
illuminated. The UK briefly required Dim-Dip
lights, described below, in an attempt to optimize the level of light
used at night in built-up areas.

David Marshall
VW Adventure Driver and BMW Adventure Rider
 
http://www.hasenwerk.ca

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