As a driver myself I think the thing that catches my attention at night are something that's out of place on the road. Things that you don't expect to see or uninformed. Most car lights are are symmetrical ,and although you notice them and take heed of there presence they generally look all the same. On a bike though,a cyclist is much more vulnerable in the event of a collision ,and think lights that can grab a motorist attention by being unusually positioned makes a driver look twice by wondering what's going on ahead. Flashing lights that are not synchronised , coloured lights on wheels that are popular with children and dare I say it helmet lights. As a rider naturally turns his head checking the road ahead, a rear helmet light will fluctuate in intensity, From a distance, I as a driver will see a bright light one second then a faint light ,as well as looking unusual in proportion to the steady seat post light. It immediately grabs my attention and will the focus my attention on the cyclist. With all things said though, if everybody were to light there bike up like Christmas trees, and use unusual lights in cycle heavy areas like London they would not stand out anymore. Out here in the country though were cyclists are less common at night I think it would be affective. When cars first started using high level third brake lights they stood out a mile compared to the older cars without them. Nowadays though virtually all cars have them, and they don't generally grab you now like they once did. Only the expensive cars with their crazy futuristic led designs grab my undivine attention by they unusual appearance.
- it made me laugh though 
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