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What Are The Top Causes of Car Accidents?

It’s important to know what is happening and what you’re up against so you can not only protect yourself and your loved ones while you’re on the road, but also know what to do should you ever be hurt in a car accident.

Human factors account for 90-95% of motor vehicle accidents, including speed, impairment, distraction, and inattention.

Odds are against us when it comes to traveling in a motor vehicle. According to media reports, studies, and statistics, the top three causes of traffic accidents include drunk driving, speeding, and distracted driving. If you drive while sober, obey the speed limit, and remain focused on the roadway, your chances of being in a serious accident will be greatly reduced. However, regardless of how carefully you may drive, you cannot account for the actions of others.

Top Causes of Car Accidents in California (Statistics)

  • Unsafe Speed (consistently #1)
    • ~27% of all fatal + injury crashes (e.g., ~40,303 crashes in the last detailed 2020 SWITRS).
    • Remains the dominant PCF in recent SafeTREC analyses (2022–2023).
  • Improper Turning (especially left turns at intersections)
    • One of the top 3 every year; high volume in urban areas.
  • Following Too Closely (primary cause of rear-end collisions — the single most frequent collision type overall)
  • Automobile Right-of-Way / Failure to Yield (including stop-sign/light violations)
  • Driving or Bicycling Under the Influence (alcohol/drugs)
    • ~9–14% of volume but massively overrepresented in severe crashes.

Accidents by County

Orange County ranks in the top 5–7 statewide for most categories due to population (~3.2M) and heavy freeway/local traffic. From OTS/TIMS/SafeTREC analyses (2022–2024 data): 

  • Speeding/Unsafe Speed: Leading PCF by volume (>6,000 crashes across all severities); ~30% of traffic fatalities.
  • Alcohol/Drug Influence: ~1,850–2,000 crashes; heavily over-represented in fatal/serious.
  • Distracted/Inattentive: ~900+ crashes.

Los Angeles County dwarfs everything (the highest raw numbers in every category—e.g., 10x+ Orange in total fatal/serious crashes). San Diego and Riverside follow similar urban/inland patterns.

Top Causes of Car Accidents

Some of the most common causes of serious injury accidents include:

  • Drunk driving: The number of alcohol-related traffic deaths increased from 9,865 in 2011 to 10,322 in the year 2012. This increase is alarming because the National Highway Traffic Safety Administration (NHTSA) reports that the total number of traffic deaths decreased by 3.3 percent. If you feel the effects of alcohol, you must avoid driving. If you see a vehicle swerving or moving erratically, pull over and call the authorities. You can see a list of DUI statistics in Orange County from the past few years in our Orange County Car Accident Statistics Report.
  • Speeding: According to NHTSA, about 55 percent of all speeding-related crashes involved a driver who was exceeding the speed limit and 45 percent involve a driver who was traveling too fast for the roadway conditions. In the year 2007, about 31 percent of all fatal crashes were speed-related resulting in 13,040 fatalities.
  • Distracted driving: You are considered distracted if your hands are off the wheel, your eyes are off the road or your mind is wandering from the task at hand. When you text, your attention is diverted in all three ways, making it extremely dangerous. It is also unsafe to make a phone call, eat or drink, talk to passengers, groom, read a map or adjust a radio while driving. There were 3,328 traffic fatalities and about 421,000 injuries attributed to distracted driving in the year 2019.
  • Drowsy driving: If you are feeling drowsy, you will struggle to focus on the road or to even keep your eyes open. According to NHTSA, about 100,000 police-reported crashes each year involve a fatigued driver. In fact, 1,550 people are killed and 71,000 are injured in accidents involving drowsy drivers annually.
  • Carelessness at intersections: Approximately 36 percent of all accidents occur as vehicles are turning or crossing at intersections. Always check your blind spots before turning, yield to oncoming traffic when turning left and obey traffic lights and street signs. Careless driving is also a primary reason for a vehicle on train accidents.
  • Wet and icy conditions: It is the responsibility of all drivers to reduce their speed and to leave more room between vehicles when roads are wet or icy.
  • Defective auto parts: It is important to properly inspect and repair your vehicle. You can also reduce your risk of an accident by staying up to date on recent part recalls and investigations. Your vehicle may be under investigation right now. You will not, however, be notified of the investigation unless the manufacturer issues an official recall.
  • Poorly maintained roadways: It is the government’s responsibility to ensure that large potholes and uneven surfaces are repaired promptly.

Car Accident Fatalities in California

2023

  • Total traffic fatalities: 4,061 (a nearly 11% decrease from 4,539 in 2022).
  • Mileage Death Rate (MDR): 1.26 fatalities per 100 million vehicle miles traveled (6% decrease from 1.34 in 2022).

Key Stats, updated July 2025:

  • Alcohol-impaired driving fatalities (BAC ≥ 0.08): 1,355 (↓ ~4.5% from 1,419 in 2022).
  • Unrestrained passenger vehicle occupant fatalities: 780 (↓ 8.6% from 853).
  • Motorcycle fatalities: 583 (↓ 10.2% from 649); of which unhelmeted: 33 (↓ ~23%).
  • Pedestrian fatalities: 1,106 (↓ ~8.8% from 1,213).
  • Bicycle fatalities: 145 (↓ ~20.8% from 183).
  • Teen drivers (ages 15–20) involved in fatal crashes: 428 (↓ ~10.1% from 476).

Sources:

2024

  • Provisional total: Approximately 3,786–3,807 fatalities (roughly 6–7% decrease from 2023, according to SWITRS/TIMS analysis; exact figure varies slightly by early reports but shows continued decline). This is the latest available from state resources before full FARS maturation (typically finalized 1–2 years later).

Source: CHP SWITRS data via UC Berkeley SafeTREC’s Transportation Injury Mapping System (TIMS), which uses official state crash records (updated December 2025 for 2024 provisional).

Additional National Trends

  • National comparison (NHTSA): U.S. fatalities fell to an estimated 39,345 in 2024 (↓ 3.8% from 40,901 in 2023) and continued declining sharply in early 2025 estimates (first half: 17,140, ↓ 8.2%). California has followed or exceeded the downward trend in recent years after earlier increases.
  • Data is updated quarterly in SWITRS/TIMS (https://tims.berkeley.edu/tools/summary/ for interactive statewide/county views; 2024 marked provisional).
  • Caltrans Strategic Highway Safety Plan (SHSP) dashboard also offers filtering of fatal/serious injury crashes over the last 10+ years with provisional data: https://shsp.dot.ca.gov/.

These figures represent all motor vehicle-related traffic deaths on public roadways (including drivers, passengers, pedestrians, bicyclists, motorcyclists, etc.).

Most Dangerous Intersections

Orange County

  • Newport Blvd and Victoria Street.
  • Beach Blvd. and Ball Road.
  • Harbor Blvd. and Lapalma Ave.
  • Edinger Ave. and Beach Blvd.
  • Chapman Ave. and Harbor Blvd.
  • Harbor Blvd and Orangethorp Ave.

Los Angeles

  • S. Figueroa St. and Slauson Ave.
  • Sepulveda Blvd. and Roscoe Blvd.
  • Figueroa Street and Manchester Ave. 
  • Roscoe Blvd. and Van Nuys Blvd.
  • Western Ave. and Slauson Ave.

If You Have Been Injured

Even if you are driving defensively and carefully, there is still a chance that someone will swerve into your lane or turn into your vehicle. If this happens to you, it is important that you know what to do. First, you must check to see if anyone has been injured. If someone has been hurt, you must report the accident to the authorities. 

While you wait for the police to arrive, you should gather the contact information from the other driver and from anyone who witnessed the accident. It can also help your potential claim if you take photos of the crash site, write down everything you remember about the accident and get your description of the crash into the police report. Make sure you never admit fault for the collision and seek out medical attention that same day.

Getting Fair Compensation

After you have received the medical attention you need, you may start to wonder who will pay for your medical bills. You have the right to file an insurance claim with the provider of the driver responsible for the crash. If the insurance adjuster denies your claim or fails to offer you an adequate settlement, you may want to research your legal options. 

As long as the statute of limitations has not passed, you will have an opportunity to file a lawsuit to receive the support you need. A successful personal injury claim can result in compensation for your medical bills, lost wages, pain and suffering, and other related damages.

Taking Action to Protect Yourself

There are many types and causes of car accidents. Drunk and alcohol-impaired drivers, distracted and reckless drivers, speeding and more, not to mention environmental factors which could leave the government at fault due to unsafe conditions or intersections, lack of signs, and so forth.

Regardless of what caused your accident, be sure that you seek out the full compensation that you’re entitled to. Nobody wants to be the victim in a serious car crash, but when it happens, then we’ll be there to protect you.

Call us today and we’ll provide you with a free consultation on how we can help you with your case, and what types of compensation you may be entitled to depending on the circumstances and causes of the car accident you were involved with.

BisnarChase Personal Injury Attorneys, LLP

Serving California Since 1978

Bisnar Chase is a top-rated personal injury law firm with a national reputation. The firm has been in business since 1978 and has represented thousands of clients. Based in Newport Beach and with offices across California, Bisnar Chase has recovered over $1 billion in settlements and verdicts, emphasizing superior client representation above all.

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Brian Chase

Articles, blogs, and content have been reviewed by legal in-house staff. Brian Chase is the managing partner of Bisnar Chase Personal Injury Attorneys, LLP. He is the lead trial lawyer and oversees cases handling dangerous and defective products that injure consumers. Brian is a top-rated injury attorney with numerous legal honors and awards for his work relating to auto defects and dangerous products. His firm has recovered over $1B for its clients. Brian is a frequent speaker for CAOC, Dordick Trial College, and OCTLA, covering personal injury trial techniques.

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