UD Man!

After many months of sleepless nights, wondering what I was seeing, I just found out what this sign means! It's been bugging me so much that I asked the prestigious BYU-bred 100-Hour Board. This board is made up of current and former BYU students who have 100 hours from the submission of a question to post an answer. However, the all-knowing board was stumped and no curiosity-slaking answer was forthcoming. Since the signs I see on my way to work each day are next to a road that was just constructed, I decided to ask a good friend of mine who works for an environmental construction company here in VA. I believe they had helped build this new road. He told me that the sign stands for "under drain". It's the marker for the outlet of an under drain for the road. He also said I may see other signs that have CD on them. Those signs mark the inlet/outlet of a cross drain on the road. My curiosity has now been satisfied, and I can go back to my regularly scheduled programming! Thanks, Mike!!