Last night I was driving a Mazda 6 towards a mini roundabout in rain, on a steet lit road, single carriageway, one lane in each direction, at 10:00 p.m.-
here. As I approached the roundabout, I scanned several times to the right and was about to accelerate, turning right when I suddenly spied the front wheel of a bicycle as the bike negotiated the roundabout from my right. I stopped in time to not scare the rider (as far as I know) but it did scare me.
The wheel and rest of the bike and rider was first spied through my windscreen, I did not see either the bike of the rider as I scanned to my right. The bike was equipped with a front light and the rider was wearing a light coloured helmet and dark top clothing.
At the time I had absolutely no idea why I didn't see the bike earlier. After a few moments reflection, I concluded a combination of factors contributed-
a) The rain drops on the side windows and outside the sweep of the wipers refracted the light from the street lamps and bike light so that it didn't register with me.
b) The relatively low speed of the bike (upright bike, rider not progressing particularly swiftly) may have meant that the light on the bike was occluded by the drivers door mirror for the whole of my approach to the roundabout.
c) I was tired and my observation fell far below the standard it should have been.
This scared the crap out of me and reinforced my decision to always wear a light on my helmet when riding at night as it gives another light source to register with an attentive driver.