Circular aircraft casting green spiral light flying north from the gulf.Driving on the I-10 east near the canal st exit, a circular strobing green light roughly 40 feet in diameter passed over the road. The aircraft was moving perpendicularly to the road. As it passed over the road the circular light strobed over the whole highway 2-3 times. We then looked up toward the sky we saw a circular aircraft flying at an altitude of about 100-150 feet northbound. Very hard to describe the light, but it was very bright, when we then discussed it afterward, we both drew the exact same picture. This light had a very particular shape and pattern to it that was clear to both of us.