Seeing there's been a fair bit if controversy about all round white lights watch this video and pay particular attention to the small rubber ducky.
The all round white light is well obscured by the operator when he stands. It's barely legal if he's sitting at the helm
I told you there's be something wrong with all lights if you look hard enough.
http://au.news.yahoo.com/video/national/watch/22627369/
Basically it's set up like this one.