I've seen this person a few times speeding along the Melling Road by Aintree Racecourse. Both occasions they were well exceeding the speed limit and also cut another motorist up. Driving through a puddle puts them even further down in my estimation.
Driving along the A12 doing 50, and this clown pulls out in front of me and slams his brakes on, what makes it worse is there wasn't anything in front of him? Dangerous, keep your distance.....
Why is she going on about cycle helmets other than as an excuse? They aren't required by law. People like her are the reason I take primary when turning at junctions (including left). It doesn't prevent idiots from under/over-taking but it does minimise their chances and they often end up - through their OWN actions - in a right mess. I've now accepted that some people simply can't drive; that the best option is to get a camera, a horn and take primary where appropriate. Last but by no means least: never, ever stop unless you have to. Some people deserve to be in a mental institution with their driving and they are simply not worth speaking to especially when they are in charge of a killing machine. If she decides to do again you could just horn her and if she persists, point to the camera. Like I say, no point in speaking to people with closed minds. Just film them and plaster it all over the Internet within the interests of public safety.
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I think you need to get out more if you think that was dangerous driving.