Pierce Elevated - Bow Saw Sighting

I spotted a small bow saw on the way home from work. The saw is located on the right shoulder of Interstate 45 south bound in the downtown area of Houston. This strech of interstate is known as the Pierce Elevated because it follows Pierce through that part of houston and it's elevated about 30 to 40 feet off the ground.

The saw is about 20 inches long, has a yellow handle and appears to be slightly bent, probably from being smashed by a car. As stated previously, this is one of the busiest sections of interstate in Houston and probably in the United States. I don't stop for anything on the Pierce Elevated.