If I've missed a turn, I tend to know it. If I'm unable to get to the lane required to turn around, the last thing I need is for the system to constantly spam me to make U-Turns, especially in locations where they're not permitted. Instead of suggesting U-Turns at every driveway, try to create a loop to turn around. U-Turns are inherently dangerous and spamming messages every few seconds only causes me aggravation as a driver.