The only time it'd likely make any difference is if you call the police IMMEDIATELY so they can opt to try to locate the person immediately and witness further offenses.
The only time I've called 911 was when I was unlucky enough to follow what appeared to be a drunk driver piloting a small delivery van up onto sidewalk curbs and back and forth across the lines on both sides of his lane. I followed him for a while afterwards and never saw any police come, then he veered off onto some side street. I never received a call back from police or otherwise saw or heard anything.
You'd be wasting your time otherwise, in my opinion. "Officer, Joe Schmoe changed lanes without signaling! That's a moving violation go get him!"
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Reckless driving..
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