APM: N/A Location: Petaluma Blvd and US 101, Petaluma No reassurance shield as 101 Business begins. Location: Petaluma Blvd and Payran St, Petaluma As we get into downtown Petaluma, turn left to connect to SR 116 east and US 101. Location: Petaluma Blvd and Washington St, Petaluma Downtown Petaluma kicks ass. Location: Petaluma Blvd and Kastania … Continue reading U.S. Route 101 Business, US-101/SR 116 to US-101