we were driving north on hwy 101 from san luis obispo to atascadero, when from the west came a "ufo" traveling east, passing over the hwy approximatly three tellaphone lengths off the ground. It was shaped more like a stop sighn (an octagone) with lights that borderd its edges we slambed on the breakes pulled off to the right hand side of the road ran up a small hill and watched as it took off threw the hills over creston, it made no sound what so ever. when we got home I called and reported it to the national defence department in washington d.c. I never heard anything back after that, they probably just got a nice laugh about it, Oh well, It did happen.