When I first tried FSD my feeling was like teaching my 15 year old adopted granddaughter to drive. However after 3 trips I gained confidence the car was safe. On one 20 minute drive on surface streets it dealt with 4 traffic circles, no problem. However, on a different street there is a traffic circle that is troublesome for many drivers. Two lanes and often high traffic density. FSB fails 5 out 7 tries. The SW basically turns off to say I can’t deal with this. Most cases it just needed to complete what it was doing and have faith the rest of the traffic would behave itself.