Yikes!

I'll go a step further. Lights on all the time. Not everyone's got HID or even rechargeable halogen, but at least turn on your blinkies, and if you have a Catye Opticube or similar LED headlight, turn it onto the flashing mode. My experience is that they'll catch my eye from a range of more than a city block in broad daylight. And if you have a rechargeable light system, and it has enough runtime to use it in the daytime, go for it.