How do police able to spot specific single vehicle out of crowds of automobile?

Do police have computerized screener which automatically alerting officers in every police car? Alerting go on without officers even looking outside to look for right car? Or police has GPS which can see every car by having secrets black box inside every vehicle so police knowing where vehicles is at anytime anywhere?

Cuz once I saw someone open cans beer drinking and drive in highway. I called police to informed them. Description of vehicle with license plate numbers. It's on highway many other vehicles looks alike. It was nigh time impossible to find it that quick.

Then 4 miles later the police was parking off the freeway at one of business property. While I was behind that car, police got on ramp right when that car passed the ramp. Police pulled them over right away.

Now question is how police find this that quick? Impossible checking everybody license plates because too many car go fast they all like alike and police was parking right opposite from where you can read the plate number.