Indeed i just looked up (googled) bicycle braking and one person did a test at 10mph and showed that using a front brake only increases stopping distance about 10% (compared to using both) whereas using just the back brake increased stopping distance by over 120% so well over twice the distance.
Apparently crash investigator Edward Small said she had stepped into the road 3.8 seconds before the crash. (calculated from CCTV)
3.8 seconds at 18mph is ~30 metres. Why did he crash into her?
So he had no brakes at all? His argument that he was ignorant of the fact he needed a front brake surely goes out the window if he had no brakes? That is surely common sense to have some way to stop.
(as an aside i'm pretty sure i knew from about 6 years old that you needed both front and...