The following numbers are the casualties in the years 2005-2012 from the government's STATS19 database.
For each casualty type, the table below shows a count of the number of casualties during daylight, and in darkness.
The numbers below show for each casualty type, the split of their accidents between light and dark. As a proportion, cyclists are safer than the other travellers in Oxford. Significantly safer than motor vehicle occupants at night. The same effect is seen in Cambridge.
|casualty_type||% light||% dark|
Why cyclists are proportionately safer at night is a mystery. Could it be that Oxford cyclists travel less at night compared to other road users? This doesn't appear to be the case in Cambridge. A theory I have for Cambridge is that unlit cyclist realise their increased vulnerability and move away from roads to cycling on pavements, away from motor vehicles. It's an effect known as risk-compensation, also seen when using safety gear.