I have mixed feelings about reporting specific cases, and generally find the cops don't want to be bothered if there's no injury. Here in NY they won't issue any kind of traffic citation for anything they don't see with heir own eyes.
OTOH- I've had some success reporting specific locations where there are problems. In one case cars weren't stopping or yielding to pedestrians in a crosswalk, that was partly hidden behind a bend in the road. I reported the hazard, and reminded the police that this crosswalk was where a park path crosses the road, and children were at risk. They were cooperative and stationed an officer to observe, and issue warnings.
Long term the only solution will be a stop sign, but at least they care.
So my advice, don't go to file a complaint, but do go to report a dangerous situation.
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Chain-L site
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WARNING, I'm from New York. Thin skinned people should maintain safe distance.