Driverless cars with backseat sexbots: the aliens’ plan for the end of humanity.
When the aliens are ready, they press a switch and all the cars drive off cliffs and overpassess while the occupant is "busy"...
ALIEN 1: So sad we had to kill them all off, I rather enjoyed watching their antics.
ALIEN 2: But at least they were doing something they apparently greatly enjoyed. It is a good thing.