Like Wombat said, it is an offence here, unless there are conditions such as fog.
A lot of clowns do drive around with them all the time, but where I used to work we did have serious fog problems, and being in the country there was little to no street lighting once out of town.
I have no probs with someone using them correctly - IE: when there is fog etc, but during broad daylight or clear nights, they are distracting and annoying.
Some cars also have automatic lights that turn on with the windscreen wipers, so that if it is wet enough to turn the wipers on, then the lights are on also.
Makes sense to me. Obviously in some places it is not as worthwhile as other, depending on weather/climate etc
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