This tale has been bouncing around the internet. I received this version from Aunt Jimmie.

I had a flat tire Yesterday, so I got out of the car and opened the trunk.

I took out my cardboard men, unfolded them and stood them at the rear
of my car facing oncoming traffic. They look so life like you wouldn’t believe it!

Cars start slowing down looking at my lifelike men which made it safer for me to work at the side of the road.

Traffic starts backing up. Everybody is honking their horns and waving like crazy. It wasn’t long before a state trooper pulled up behind me.

‘What’s going on here?’

‘My car has a flat tire,’ I said calmly.

‘Well, what are those cardboard men doing here by the road?’

I couldn’t believe that he didn’t know, so I told him, “Helloooooo, those are my Emergency Flashers.”