Fullerton is south of I-60, so I-10 is too far north.
On I-60, west of the 605 is Rosemead Blvd. Go north 1/2 block to park entrance. Left turn into park, past guard shack, left again, follow road around to the C/L circles.
It's a large asphalt pad with two paved circles, one paved fenced speed circle, and two grass circles, one with a concrete carrier deck. There is a tether car track there too.
Chris...