After more than 40 years in my junkyard box, I pulled out pieces of this model for a contest. I managed to find all of the parts except the rooftop spike was missing. I made the spike, base, and surfboard.
The driver was probably shaking the car down on the 15 or 5 and was passing thru San Marcos to head back down the freeway. Also, for those who think SD housing is pricey, try searching Pete's neck of the woods in North County in the +55 areas. You'd be surprised at prices, but the HOA fees are rather high.