Even accounting for holiday and weekend travelers, highway construction and the occasional fender-bender, traffic through Marin County into Sonoma County was worse than usual Saturday, the CHP said.

While Saturday marked the first day of weekend visitors to the new Graton Resort & Casino in Rohnert Park, CHP officials in Marin County would not say hopeful gamblers were to blame for bumper-to-bumper traffic through the Novato Narrows just south of Petaluma.

"We don't know where all these people are going that were just passing through our area," said a CHP spokesman Officer Andew Barclay. "It's bigger than usual backup, bigger than a normal weekend."

Traffic flowed freely on Highway 101 through Petaluma and Rohnert Park throughout most of the morning. But real-time traffic maps showed significant delays through the Novato Narrows and Petaluma throughout the afternoon.

"I don't know if that's casino-related, it is a big beautiful day. I wouldn't jump to any conclusions just yet," Officer Nanad Gorenec.

Gorenec said extra CHP officers will be working casino-related details all weekend from 2 p.m. to 2 a.m.

"They're only assigned to traffic control for the casino this weekend."

Follow the trip

To help people follow his journey, Alan Soule set up a Twitter account (@Team_USA_80eday), a Periscope account (alanmso), and a team website (teamusa-80edays.com). Soule’s car is equipped with a 360-degree camera, which he’ll use to upload video as he travels. Anyone interested in his journey can reach out to him with questions, tips or Periscope requests at teamusa80edays@gmail.com.

To track his exact GPS movements, scroll to the bottom of the 80edays homepage (80diaselectricos.com), and find the interactive map at the bottom to select which teams to track.