Yeah know its not good he walked away from the scene.
The lady was in the left lane which has priority.
From what he said initially he was past her from the traffic lights and was to cut in but then she accelerated unexpectedly it seems, but yeah as you say, my thoughts to left lane gets priority just not sure if it was to a late to hang back by then.
I still disagree that there is any priority given to the left or right lanes, it's purely on who is ahead when the lanes merge (unless it's clear that a particular lane is ending).Basically a 30/40mph road, where 2 lanes filter in 1. He was on outside and accelerated keenly away to go past car on left, it seems as he went to go past lady in other car decided to accelerate also. Meaning they were then neck and neck as 2 lanes ran out.
He had initially thought he had hit a bollard or similar on right side and I think was looking to left to much at the lady not letting him in.
Unfortunately he left the scene with shopping as he is a carer for my Mum who had a massive stroke and is paralysed down one side, and my dad has always been quite anxious about leaving her alone, but knows now should not of left the scene.
If the driver in the right lane is ahead and the driver in the left lane then tries to pass, they are 'overtaking on the inside' or colloquially, undertaking. That is the action that led to the collision.
The driver did not 'leave the scene'; there are reasons why a driver doesn't have to remain - in this instance keeping the period of unattendance of a cared for person to a minimum, but reasons in other circumstances might include fear for safety - car-jacking, road rage.
But where the driver's legal failure comes is in failure to report within 24 hours. That is serious.