I left my front lights off this morning. With British Summer Time I leave in the light and get home well before dusk. It was a lovely morning, until I got to the other side of the downs when visability suddenly dropped dramatically as I ran into low lying fog. Despite having my rear lights on and wearing floro/reflective over jersey I was almost tail ended by a driver going too fast who had the cheek to tell cyclists shouldn't ride in fog... This and even thicker fog when I reached the main road meant I decide to climb up the other side of the downs and come into work above the fog rather than risking the main road without a front light.