Yeah, my son's FIL raced there as well. Over in Oakland we used the Outer Highway, the frontage road on the west side of 880 across from the Coliseum. We had a small-block rail on the trailer there one night with an OPD car watching. So we sat, waiting for them to leave. Finally, they drove up and said "We'd like to see it go, but we can't wait here all night!"
Ha-ha, good one. Cops are people too. I've had my cars pulled over, thinking the worst but cops just wanted to check out what I had compared to their hobby cars. Last Chevy I had was a '57 2-door coupe (no window posts), with a 327ci and header pipes out the side with glass pipe mufflers below the doors. Loud. Offset spindles in front, flipped rear axle with hydraulic shocks I could raise and lower with balloon tires on deep chrome wheels. Stopped a bunch of times but never ticketed. My '56 Chevy had a straight axle in front with the same gear and sat high. Gave it all up in my 20's, sigh. I miss Champion Speedway racetrack in SF near the Cow Palace, some days I could race others in my Chevy, good legal fun. All these old venues long gone.