Remember kids... always wear a helmet. (The almighty bikeradar helmet thread)

When you have a cycle training lesson with someone for two hours, it starts at 2 in the afternoon and they ask if they have to have lights on their bike then you know that something is wrong.

Should you have lights on at that time? I have to confess that I only turn mine on when it is dark but I suppose one ought to always have lights on to be better seen. Is that your recommendation Will?