7db wrote:And I'm guessing it's not just the highly trained Traffic officers who get to dish them out, but also any constable with a pen and a book of tickets.
That was a concern of mine too when I first heard about this idea (the idea's been around for a while hasn't it?)
Careless driving is, as you say, subjective and widespread. And so it makes some sense to me that you'd only want the subject matter experts - the people whose training, knowledge and experience in this area best equips them to identify the behaviours that most need tackling and, importantly, instances that would be likely to result in a conviction if it went to court - in a position to dish out such tickets. I'm not sure simply being a police officer qualifies for that.
I don't know if, when such a power is created, there is a way it can be given only to a subset of officers, but as michael769 suggested a police force could always choose to restrict itself with its own policy. I spoke to a traffic officer in my local force about this and he thought that if this did come in it would only be traffic police using it in our force. That was some time ago (and his personal impression, not the official voice off force policy) and I don't know if it's actually the case.