Pulled over!

I was pulled over by the police today, in my car.
I wound down my window and the copper said, "Would you like to have a guess sir?"
I said, "30?"
"Try 45." He replied.
I said,
I wound down my window and the copper said, "Would you like to have a guess sir?"
I said, "30?"
"Try 45." He replied.
I said,
Spoiler: