"Private Road Right to Pass by Permission of Diablo Community Service District"
- Diablo Community Services District signs (2023) posted at All three Entrances. Compelling the Public to Ride on Dangerous Diablo Road (video below)
- "Association of Calle Arroyo Neighbors"Posted "No Trespassing" Signs below (2018 to 2020) (slideshow below)
- Hired a Security Guard (June 4, 2020) to give Cyclists a Notice (below); "Unauthorized use of Calle Arroyo is trespassing and a crime." (slideshow below)
- Attorney Sent Intimidating letters (below) to local high school mountain bike and cross-country teams; "Diablo roads are private and use by the general public is prohibited."
- Hundreds of cyclists are Compelled to Ride on Dangerous Diablo Road (video below).