I was using the self driving in about 65 miles per hour this was little bit under speed limit in highway in Florida. Suddenly the car started to do zig zags and cycles alone and when I tried to control the car and drive my self the car didnât respond to me and self driving couldnât be stopped I couldnât switch to regular driver this was self driving malfunction and could cause big accident in a highway. The car stopped because it took me out of the road and hit the guardrail.