I am afraid people loose concentration or to be more precise humans are not up to the job of driving cars safely. Bring on the automated car!Perhaps someone will be along shortly with actual citations and stuff, but iir the research here says that the severity of punishment is not really a serious deterrent but the likelihood of the law actually being enforced is. So, even if the penalty for carelesss/dangerous driving is a mere three weeks inside, the incidence of drivers hitting cyclists they "just didn't see" would go way down if only they knew it was a certainty they'd actually receive the said punishment instead of walking away after clueless plod/cps says "his word against yours, no point pursuing this" or "it was only a pushbike"
By the way one persons word against another Is never pursued unless there is other evidence.