She's 81 years old. How far and how fast left could she have moved once she heard "on your left" and the bell?
Why was the cyclist trying to "buzz the tower" so to speak on this old lady?
What if one has hearing issues?
There's that too but his saying "on the left" and ringing the bell doesn't absolve him of being negligent in trying to pass her within 2 sheets of paper and thus hitting her.
Just because I honk my horn, doesn't mean I can merge, traffic be damned.
