I'd be interested in people's opinions of the best front and rear light modes for warning drivers of your presence. I was out on my road bike this evening and it has a small Moon front light - don't know the exact model but it was given free to me by the bike shop that I bought the bike from, and it has a couple of steady modes and three flashing modes.

One of the flashing modes is 'epileptic seizure' strobe! It annoys the hell out of people but is easily the most noticeable by both pedestrians and drivers. However, because of its potential to cause discomfort to people, I avoid using it. I usually leave it on one of the slower flash mode.

What light modes do you use for your front and rear lights assuming you're riding at dusk or night with street lighting?