Hacked road signs

You know those electric highway signs that often display annoying but important messages about upcoming traffic concerns? They’re called dynamic message signs, and a certain brand of them is as easy to hack as changing lanes on the highway.
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How to beat a speeding ticket

A police officer pulls a guy over for speeding and has the following exchange:

Officer: May I see your driver’s license?
Driver: I don’t have one. I had it suspended when I got my 5th DUI.

Officer: May I see the owner’s card for this vehicle?
Driver: It’s not my car. I stole it.
Officer: The car is stolen?
Driver: That’s right. But come to think of it, I think I saw the owner’s card in the glove box when I was putting my gun in there.

Officer: There’s a gun in the glove box?
Driver: Yes sir. That’s where I put it after I shot the woman who owns this car and stuffed her in the trunk.
Officer: There’s a BODY in the TRUNK?!?!?
Driver: Yes, sir.

Hearing this, the officer immediately called his captain. The car was quickly surrounded by police, and the captain approached the driver to handle the tense situation:

Captain: Sir, can I see your license?
Driver: Sure. Here it is. It was valid.
Captain: Who’s car is this?
Driver: It’s mine, officer. Here’s the registration.

Captain: Could you slowly open your glove box so I can see if there’s a gun in it?
Driver: Yes, sir, but there’s no gun in it.
Sure enough, there was nothing in the glove box.

Captain: Would you mind opening your trunk? I was told you said there’s a body in it.
Driver: No problem. Trunk is opened; no body.

Captain: I don’t understand it. The officer who stopped you said you told him you didn’t have a license, stole the car, had a gun in the glove-box, and that there was a body in the trunk?

Driver: Yeah, and I’ll bet the big liar told you I was speeding too!