We just did a practice session and used the stop and go on the Smart Cruise Control. Maybe there is a setting somewhere that we have missed. We have it set at 4 car lengths. The stop and go seems okay in city traffic at about 60 km per hour. However hubby and I both agree the stops are a bit more aggressive and abrupt than we usually make. When we are using it at higher rate of speed i.e. 80-90, it is horrifying! It is not slowing down at all until we are nearly up the butt of the vehicle ahead. Then the brakes go on. I was ready to get out and walk as I was shaking so badly as my husband was trying it out. I was to the point of yelling "we're going to die!" The first go around we raced up on the back of a semi trailer stopped and hubby was ready to apply the brakes, but I was saying "for God's sake, put on the brakes". Hubby is perplexed. All we can figure out is it programmed for today's style of driving where we see people race up behind someone and abruptly stop. I hope someone here with a car will jump in and say what there stop and go experiences are like at higher speed than city driving. My husband says it helps with driver alertness to stop at the last instant. lol For me, it confirms my dislike of cruise control. I just read we can use regular cruise control instead of stop and go by pressing the distance feature for more than 2 seconds so we will go for that until we figure out what others experience.