This is the north end of the Hollywood Freeway. It was built with cloverleaf interchanges designed so that you didn't really have to worry about merging with the other cloverleafs. Pretty cool. It was built in a park in North Hollywood. This set is from April 1988, so I am sure this area has changed since then.
170 merges into the center divide rather than the right shoulder of I5 at its northern end. Another freeway (64?) was supposed to go from the 170 and I5 interchange towards Santa Monica. 14 was also supposed to run south of the I5 / 14 interchange. This is near Roscoe Blvd. Also 170 was proposed to run down to the area by the Los Angeles Airport.