Yet another police joke.

A police officer stops a car for speeding.
"I'm sorry, but I have to give you a ticket. However, I won't fine you if you solve this riddle." says the officer.
The man in the car accepts.
"Okay then. It's nighttime, you're on a road and you see two lights approaching. What is it?"
"A car", promptly answers the man.
"That's too vague-", says the officer, "it can be any kind of car. I'll have to give you a ticket."
"No!", says the man, "give me another chance."
The officer agrees and says: "It's nighttime, you're on a road and you see a single light approaching. What is it?"
"A motorbike", answers the man.
"That's too vague-", answers again the officer, "it can be any kind of motorbike. I'm sorry but you failed again."
"Oh come on! Give me a last chance!" says the man.
The officer agrees again and says: "It's nighttime, you're on a road and you see two low and wide-apart lights. What is it?"
"A truck", answers the man. But again, the officer says it's "too vague".
So the man goes: "Considering that we're playing games, may I give you a riddle too?"
"Okay" says the officer. The man proceeds then to tell: "It's nighttime, you're on a road and you see a flickering light. Close to it there is a young woman dressed in a revealing outfit. What is it?"
"A whore", says the officer.
"Too vague!", says the man, "It could be your mom, your sister, your wife..."