I used it today several times. The first time it worked pretty well, slowed down on the ramp to enter the freeway, merged quite well and no issues beyond since I didn't exit with it. Second time was very shaky, it wanted to move into the left/fast lane 1 mile before exit to the right lane, I stayed in the right lane as I knew the exit was coming, it did exit to the right and into a 25 mph on ramp at 50 mph. I was ready and had to take over. Entrance to the freeway was not good as a car was on my left when I arrived at the entrance, the car continued at the same speed and same lane headed into another exit ramp if I didn't take over. A few additional times with similar experiences. I will forgo anymore Drive By Nav. until is gets a bit more stable. I love the car and love how auto pilot has been thus far but this is a little to risky for me to keep going. Perhaps another try when no one else is with me I will do a few more runs. Interesting the time when it was going 50 mph into a 25 mph ramp was between 2 major interstate junctions, not sure if that has any relevance but not like it was a lesser traveled highway.