system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does a police officer prove his radar reading was specifically for your car when there's hundreds of cars whizzing by on a busy highway?
gpt
They point it at your car. They can observe you are moving faster than the other traffic and they stop you under their own judgment. In court their judgment is generally considered to be reliable evidence that a particular motorist was behaving incorrectly.