It means that you were observed driving in a manner that is not prudent or smart. And for the area you were driving in, your speed was believed to be unreasonable at that time.
That would be a moving violation. As such it will show up on your driving record.
indulgent, absurd, extreme, imprudent, unreasonable, costly, exorbitant,
"Prudent" means careful or cautious; "imprudent" means risky or incautious. "Imprudent actions" are risky ones.
in a imprudent manner
Simple, witless, inane, stupid, asinine, silly, senseless, imprudent, unreasonable, irrational, ridiculous, foolhardy, thoughtless, preposterous, absurd, nonsensical
I was imprudent to place myself at such risk.
A synonym for goofy could be a nutball, or a knucklehead.
It would be imprudent to ask a personal question during a class.
The imprudent man walked home.
The word imprudent means being careless or acting unwisely. His imprudent remarks about his boss cost him his job. Building a full-scale model of an untested design would be imprudent.
Uncle Jesse's financial losses are a result of his imprudent investment choices.
Getting behind the wheel of a car while intoxicated is an extremely imprudent decision.