Location of the road in Eminem's Stan video

Round Details
Title: [Round 90537 Dear Slim, please transcribe a sentence on the newly placed sign around this road at 4:56 (the green sign with an arrow in the bottom right corner) (Round made possible with Birdseeding) ]

Host: /u/PackOfZigZags

Duration: 2h33m

Winner: /u/Oxygen0796

Answer: Turn right in 400 feet at old san gabriel canyon road