Why They’re Risky: 

• Broadway (SR-12) & Napa St occurred 32 incidents largely because of its location in Sonoma's busy downtown with tourists and cars on SR-12, causing rear-end and side-impact collisions. 
• 5th St W & Napa St is a hotspot due to its commercial activity and frequent traffic signal violations (33.97% of severe crashes). 



Pro Tip: Exercise extra caution at these intersections during tourist-heavy weekends or festivals, when pedestrian and vehicle traffic spikes. 

Sonoma’s Riskiest Roads 

Sonoma’s roads, from downtown arterials to SR-12’s high-speed stretches, see heavy use from locals and visitors alike, leading to frequent crashes. Here are the top 10 crash-prone roads, based on SWITRS and Caltrans data for all crash types (property damage, injuries, and fatalities). 

Why They’re Risky: 

• Broadway (SR-12) holds the crown with 380 accidents as it is the most traveled way through Sonoma, which takes tourists to wineries and commuters through downtown.  
• Napa St and 5th St W are prone to crashes in the urban core, where pedestrian traffic and distracted driving (e.g., texting or navigation) are common issues. 



Pro Tip: Watch for pedestrians and cyclists on Napa St and 5th St W, especially near shops and restaurants. 

Why Crashes Happen in Sonoma 

A combination of driver behavior, traffic volumes, and the rural and urban character of the roads influences crashes in Sonoma. Statewide Integrated Traffic Records System (SWITRS) data identifies the leading contributors: 

• Speeding: Accounting for 27.4% of all crashes, especially on Broadway (SR-12) and Sonoma Hwy, where higher speeds decrease time to react.  
• Ignoring Traffic Signals: Accounts for 33.97% of severe crashes, leading to T-bone collisions at intersections like 5th St W & Napa St. 
• Failure to Yield: Contributes to 23.72% of crashes, often involving pedestrians or cyclists in downtown areas. 
• Distracted Driving: A significant issue, with 24,611 improper turning-related injury crashes statewide in 2020, linked to phone use or navigation in tourist-heavy areas. 
• Drunk Driving: Plays a role in 9.62% of severe crashes, especially late nights (6 PM–midnight) during winery events or festivals. 

Sonoma’s tourism-driven traffic and compact downtown amplify these risks, with pedestrians and cyclists adding complexity. The Sonoma Police Department’s DUI checkpoints help, but limited staffing can hinder enforcement. 

Pro Tip: Stay alert and patient, particularly downtown Sonoma, as distracted driving can lead to expensive mistakes.  

Where Fatal Crashes Strike in Sonoma 

Fatal crashes are less likely; however, they can be catastrophic when they do happen, frequently occurring on high-speed roads or busy intersections with pedestrian exposure. What follows is a list of Sonoma’s most prevalent fatal crash site locations covering the top sites from 2020 to 2023, based on SWITRS and FARS records.  

Why They’re Deadly: 

• Broadway (SR-12) & Napa St saw two fatalities, often involving pedestrians or high-speed collisions in the busy downtown core, with alcohol linked to 9.62% of severe crashes. 
• Sonoma Hwy (SR-12) & Watmaugh Rd had one fatality, tied to high speeds on this rural stretch. 
• Sonoma had 5–8 fatal crashes over this period, with pedestrians making up 25% of statewide road deaths. Sonoma County reported 47 vehicular manslaughter cases since 2019, some outside city limits. 

Pro Tip: Slow down on SR-12 and watch for pedestrians in downtown areas, especially during evening hours. 

Where Serious Injuries Occur Most 

Serious (non-fatal) injuries typically arise from crashes involving pedestrians, cyclists, or high-energy crashes, and SWITRS/TIMS data also identifies Sonoma's categories of serious injury crashes.  

Why They’re Risky: 

• Broadway (SR-12) & Napa St leads with 30 serious injury crashes, driven by pedestrian and cyclist incidents near tourist attractions. 
• 5th St W & Napa St sees high injury rates due to urban traffic and signal violations (33.97% of severe crashes). 

Pro Tip: Be extra cautious around cyclists and pedestrians in downtown Sonoma, especially near popular spots like Sonoma Plaza. 

Drive Smart: Safety Tips for Sonoma’s Roads 

To stay safe in Sonoma’s busy and tourist-heavy environment: 

• Keep to Speed Limits: Speeding causes 27.4% of crashes. So stick to the speed limits and remember to slow down on SR-12 and the downtown streets.  
• Stay Focused: Avoid distractions like phones, particularly in pedestrian-heavy areas like Napa St. 
• Follow Traffic Signals: Signal violations trigger 33.97% of severe crashes. Pay attention at intersections like 5th St W & Napa St. 
• Don’t Drive Drunk: Alcohol is linked to 9.62% of severe crashes. Opt for rideshares or a sober driver during winery visits or festivals. 
• Plan for Traffic: Allow extra time during rush hours (7–9 AM, 4–7 PM) or tourist-heavy weekends to avoid frustration on SR-12. 

Facing the Aftermath of a Crash in Sonoma 

Sonoma has many colorful, vibrant, and busy streets and scenic highways. But that can turn deadly in an instant. The effects of a crash can impact your life and your family's life physically, emotionally, and financially. If you or a loved one has been involved in a collision, there are professionals (medical or legal) who can help you take the first steps toward healing and justice. Drive smart and safe, and do your part to keep Sonoma roads safe for everyone. Call Flahavan Law today at (707) 525-2917!