Mainly, it was done for hurricane evacuations. Back in 2004-05, when we had multiple hurricanes hit the area, this old road was jammed up for 50 miles or more.
Anyway, looked like a nice place to place a park & grab, although you will have to walk a little more than usual. You're looking for a camo'd plastic container, filled with swag when hidden, and large enough for most trackables.
Please replace everything back the way you found it, for the next cacher, and make sure you zip the baggie, and put the lid back on tight. Thanks, and have fun!