Sharraxaadda

There is a stop sign on Ayd Mill Rd. that stops all traffic, 24/7 so that a few cars that have to get into a parking lot on Selby Ave. won't have to drive a mile down the road to make a U turn. The few cars only need this sign in the morning when they come to work.
Why is there not a yield sign for the few cars that have to make a U turn?