California has a love affair with cars that’s well known. In fact, there are more vehicle registrations in the Golden State than in any other—and it isn’t particularly close. With over 13 million active vehicle registrations, we have almost as many cars as Texas and Florida combined. Despite that, California has only half as many miles of roadway as Texas. That makes the roads here extremely congested, and in some cases, quite dangerous.
In 2024, California experienced 3,786 fatal motor vehicle crashes, which was the second-highest death toll nationwide. But as bad as that sounds, it’s important to note that not all California roads are equally dangerous. Some roads stand out from the pack. As you might expect, heavily used highways are more dangerous than local roads. That means you can improve your odds of a safe trip by exercising greater caution on particularly dangerous routes. Fortunately, the experts at Maison Law Accident and Injury Lawyers have crunched the numbers and come up with a data-backed list of California’s deadliest roads. Here are the seven deadliest stretches of roadway in the state.
I-5 Through San Diego County
By far, the deadliest stretch of road in California is the portion of I-5 running through San Diego County. It saw a total of 38 fatalities in 2024. It also tallied 1,023 accidents with injuries that year. The danger stems from several issues. One is the sheer volume of traffic passing through the area daily. I-5 cuts through Los Angeles, San Diego, and the San Francisco Bay Area, the state’s three major population centers. Heavy traffic also causes roadway deterioration, leading to suboptimal driving conditions and frequent construction.
I-5 Through Los Angeles County
Unsurprisingly, another stretch of I-5 tallied the second most fatalities statewide. The portion of the route passing through Los Angeles County saw 29 fatalities in 2024. And as for serious accidents, it fared even worse, with 1,544 reported accidents resulting in injuries. The problems with the roadway are similar to the rest of I-5. However, the relatively heavier traffic in the area likely keeps average speeds lower, making fender-benders more common and high-speed collisions less so. Unfortunately, reckless driving is common on I-5, which is a likely explanation for the still-high fatality rate.
Highway 99 Through San Joaquin County
The third-most-deadly roadway in the state is the portion of Highway 99 running through San Joaquin County. Anyone who’s passed through the area can likely tell you why. A combination of high traffic volumes, an outdated design, short on and off-ramps, and too few lanes makes it a nightmare for drivers. Those issues contributed to 15 fatalities and 350 accidents with injuries in 2024.
I-40 Through San Bernardino County
Only slightly less dangerous is the stretch of I-40 that passes through San Bernardino County. It experienced 15 fatalities in 2024, just as Highway 99 did. However, it had far fewer serious accidents, with only 99 for the year. Part of the problem is the volume of truck traffic on the route, creating challenging driving conditions for commuters. Plus, periods of high heat seem to make the roadway slightly slick, according to locals.
I-80 Through San Francisco County
The next most deadly road in California is the portion of I-80 running through San Francisco County. While it saw only 6 fatalities in 2024, it also had 234 serious accidents within the year. That’s reflective of the route’s traffic congestion and relatively low-speed travel. However, local drivers report issues with speeding and distracted driving, particularly during rush hours. When you add a steady stream of truck traffic to the mix, you get a recipe for a dangerous road.
Highway 99 Through Fresno County
Although not as treacherous as the portion running through San Joaquin County, the part of Highway 99 passing through Fresno County still sees its share of accidents. There were only 4 deaths along the route in 2024, along with 270 serious accidents with injuries. Locals cite the persistent Tule Fog as a primary contributing factor. There’s also plenty of agricultural traffic along the route, creating challenging driving conditions and demanding drivers’ attention.
I-280 Through Santa Clara County
Finally, the seventh-most dangerous road in California is a part of what locals know as “The Bay Area’s Most Dangerous Commute”. It’s the portion of I-280 passing through Santa Clara County. It’s the key route bringing workers into and out of Silicon Valley. It witnessed 3 fatalities and 320 serious accidents in 2024. Along the route, heavy traffic and a high rate of wildlife collisions are primary contributors to the danger.
Use Caution and Avoid the Danger
Now that you know the locations of California’s deadliest roadways and what contributes to the danger, you can take steps to stay safe. For example, you can take the time to plan alternate routes or be extra cautious when that’s not possible. Hopefully, being forewarned of the danger can help you avoid becoming a part of these unfortunate statistics.
