Well we never got in trouble for this, but we filled a black sock with pea stones from a neighbor’s driveway, tied it to heavy fishing line, and pulled it across the street as cars were coming. This was in a small town on a low mph road, btw. It was fun watching cars swerve a bit and/or lock up the brakes. We never pulled it across if there were two cars.
Oh, and we took down a 30 MPH speed limit sign and, using black paint, made it read 80 MPH. Put it back up the same night, and it STAYED THAT WAY FOR OVER A YEAR before they fixed it.
It is a single lane bridge on a very rural road that all the Trentonites that work at the women's prison in Clinton, NJ use as their "shortcut". 5 years ago there were rumblings that the County Engineer wanted to blow 2 million bucks on a new bridge there... which made no sense as it was a very isolated spot, the road took a 90° bend right next to the bridge, and there was an abandoned railroad grade there too... the road was a country road good for 35.
All it really needed was a fresh coat of white paint. The neighbor's used to put up hanging baskets of begonias hanging from the trusses... it was very quaint... peaceful.
Last time I was home I saw they started work on the new bridge. The old structure was gone... and here they are blow MILLIONS in tax revenue when all it needed was 5 gallons of white paint and a couple drunks on mischief night.
After (1.1 Million Dollars in grant money was spent):
Actually looks nice... but, still, that was a lot more than a few gallons of paint.