Table of Contents
California State Bar #249405
Admitted 2007
California Personal Injury Attorney
- July 2026
The US-101/SR-92 interchange area and the US-101/Peninsula Avenue interchange are among the highest-collision locations in San Mateo, according to the California Highway Patrol’s California Crash Reporting System (CCRS) 2025 data. US-101, as a full corridor, recorded the most reported collisions of any single roadway in the city, followed by SR-92.
Rear-end and sideswipe collisions were among the most frequently reported collision types citywide. Many of the people involved face emergency room visits, time away from work, and ongoing physical therapy or chiropractic care.
San Mateo sits at the crossroads of Peninsula commuter traffic: US-101 funnels drivers between San Francisco and Silicon Valley, while SR-92 serves as a primary East Bay connector. That geographic reality — heavy through traffic, fast-moving merges, and a commuter population that uses these corridors daily — is what distinguishes a San Mateo freeway crash from a typical local road incident.
If another driver or a public agency’s road maintenance failure caused your crash, California law may give you the right to seek compensation. Understanding which locations cause the most collisions and what legal options are available can help you act quickly if you’ve been involved in a San Mateo road crash.
Data Transparency Note
This page relies on 2025 crash data from the California Highway Patrol’s California Crash Reporting System (CCRS), available at data.ca.gov. The CCRS database is updated on a rolling basis as crash reports are submitted, corrected, and finalized, so 2025 figures may change as the dataset matures. All crash counts are collision-event totals, not individual victim or injury counts, which are tracked separately. The collision rankings and data reflect reported incidents for the City of San Mateo only.
Most Dangerous Intersections In San Mateo
The US-101/Peninsula Avenue interchange is one of the most prominent collision clusters in San Mateo’s 2025 CCRS data. Each direction of travel is tracked separately in the dataset because northbound and southbound lanes have different on-ramp layouts, exit configurations, and traffic volumes. Combining them would mask the specific patterns that make each approach risky.
The table below lists the freeway interchanges and intersections in San Mateo with the highest reported collision volumes in 2025. All rankings come from a city-level filter of the CCRS’ 2025 dataset and are subject to revision as the database is updated.
| Intersection | Reported Accidents (2025) |
|---|---|
| US-101 N/B & Peninsula Avenue | 30 |
| US-101 S/B & SR-92 | 29 |
| US-101 N/B & SR-92 | 27 |
| US-101 N/B & East Hillsdale Boulevard | 24 |
| US-101 S/B & Poplar Avenue | 22 |
| US-101 N/B & Hillsdale Boulevard | 12 |
| US-101 S/B & 3rd Avenue | 12 |
| US-101 N/B & 3rd Avenue | 11 |
Source: California Crash Reporting System, Crashes_2025 dataset (CHP / data.ca.gov). Rankings reflect relative collision volume; counts are collision events, not individual injuries. Data subject to revision.
A high collision volume at a specific interchange does not automatically establish that the road is defective or that any particular driver is at fault. What it does show is where traffic conflicts cluster, which can be relevant if a road design issue, a malfunctioning signal, or a Caltrans maintenance failure contributed to your crash. If a government agency’s failure played a role, the claims process is different from a standard insurance claim, and the deadline is much shorter.
Most Dangerous Roads And Freeways In San Mateo
US-101 carries more collision reports than any other corridor in San Mateo, reflecting its role as the primary Peninsula spine connecting San Francisco to the south. SR-92 ranks second and is notable because it serves both local crosstown traffic and commuters using it as an East Bay connector. This combination produces heavy merge activity at the US-101 junction.
The table below covers the roadways with the highest reported collision volumes in San Mateo for 2025, based on the same CCRS dataset.
| Roadway | Reported Accidents (2025) |
|---|---|
| US-101 N/B | 179 |
| US-101 S/B | 117 |
| SR-92 E/B | 48 |
| SR-92 W/B | 42 |
| South El Camino Real | 19 |
| South Norfolk Street | 9 |
| North El Camino Real | 8 |
| North Delaware Street | 6 |
Source: California Crash Reporting System, Crashes_2025 dataset (CHP / data.ca.gov). City-level extract; rankings reflect relative collision volume.
The collision totals above come from 2025 CCRS data for the City of San Mateo.
El Camino Real has a substantial reported collision volume. It functions as a surface arterial with numerous driveways, cross streets, and pedestrian crossings, a different collision environment from the city’s access-controlled freeways.
High collision volumes on a roadway do not mean every crash there will support a liability claim. Still, they do signal areas where attentiveness and prompt evidence preservation matter most after a collision.
Collision Types Reported In San Mateo
Rear-end collisions are the most frequently reported crash type in San Mateo’s 2025 CCRS data, followed by sideswipes. Both are strongly associated with freeway and high-speed arterial driving. The dominance of these two types reflects the high volume of stop-and-go freeway traffic on US-101 through San Mateo, where following distances collapse during commute hours.
The table below shows all reported collision types for the City of San Mateo in 2025, ranked by relative volume.
| Collision Type | Reported Accidents (2025) |
|---|---|
| Rear End | 328 |
| Side Swipe | 251 |
| Hit Object | 80 |
| Broadside | 76 |
| Vehicle/Pedestrian | 39 |
| Head-On | 35 |
| Overturned | 4 |
Source: California Crash Reporting System, Crashes_2025 dataset (CHP / data.ca.gov). City-level extract; rankings reflect relative collision volume.
The collision totals above come from 2025 CCRS data for the City of San Mateo.
Rear-end crashes often result from tailgating, sudden braking, or distracted driving, situations where the rear driver’s conduct is the primary focus of a negligence analysis. Sideswipes frequently involve unsafe lane changes or failure to check blind spots, which can implicate multiple drivers depending on which vehicle crossed the lane line. Broadside crashes at intersections like those on US-101 may involve failure to yield or red-light violations, and they tend to produce more severe injuries because the struck vehicle absorbs the impact at its door panels rather than its front or rear crumple zones.
Head-on and overturned crashes account for a smaller share of San Mateo’s reported collision count, but these crashes can cause serious and fatal injuries. Common injuries across all collision types include whiplash, herniated discs, fractures, concussions, traumatic brain injuries (TBIs), spinal cord damage, internal organ injuries, and soft-tissue tears.
If you sought treatment at San Mateo Medical Center’s emergency department or another facility after one of these crashes, those records can be among the most important pieces of evidence in your claim.
Who May Be Responsible For A Crash At A San Mateo Intersection Or Freeway
The fault in a San Mateo freeway or intersection crash depends on the specific conduct and conditions that produced the collision, not simply on who was hit. California applies a rule called pure comparative fault, meaning that even if you shared some responsibility for the crash, you may still recover compensation. Your percentage of fault reduces your recovery, but it does not eliminate it.
Several parties can share responsibility for a single crash, depending on the facts:
- Negligent Driver: A driver who was speeding, tailgating, distracted by a phone, impaired, or failed to yield can be held liable under California’s negligence standard.
- Commercial Driver or Employer: When a truck, delivery vehicle, or rideshare driver causes a crash while on the job, the employer may share liability. Commercial carriers operating on US-101 are subject to additional federal and state regulatory duties beyond those applicable to ordinary drivers.
- Vehicle Owner: An owner who permitted another driver to use the vehicle can be held vicariously liable under California’s permissive-use statute (Vehicle Code § 17150). If the owner knowingly entrusted the vehicle to an unlicensed or otherwise unfit driver, broader liability may arise under negligent entrustment principles.
- Government Entity: If a dangerous condition on a highway like US-101 or a city street, such as Peninsula Avenue, contributed to the crash, the California Department of Transportation (Caltrans) or San Mateo County may be a potentially responsible public entity. A city, county, or other agency may be involved only if it owns, controls, or maintains the particular road, signal, or facility at issue. Responsibility must be confirmed for the exact location.
- Vehicle or Parts Manufacturer: If defective brakes, tires, or a steering component contributed to the crash, a product liability claim may be available separately from or in addition to a negligence claim.
Many people who are unsure about their situation look for free advice from a traffic accident attorney as a first step. An initial consultation gives you a factual assessment of who may be liable and what evidence matters most before that evidence disappears.
If you were injured in a San Mateo collision, Arash Law is ready to help. Call (888) 488-1391 for a free initial consultation — no attorney’s fees unless we recover for you.
What To Do After A Crash On A San Mateo Road
The actions you take in the hours and days after a crash directly affect both your medical recovery and the strength of any legal claim you may have. Insurance carriers scrutinize gaps in treatment, missing police reports, and vague or inconsistent statements. A clear, consistent record built from the scene forward gives you the best foundation.
When it is safe to do so, take the following steps:
- Call the San Mateo Police Department or 911: For crashes on local streets within San Mateo city limits, the San Mateo Police Department responds. For crashes on freeways like US-101 or SR-92, the California Highway Patrol handles the report. CHP has primary jurisdiction over all state freeways, including those passing through city limits. Request the report number before leaving the scene. That way, you can retrieve the official collision record later.
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Seek Medical Evaluation Promptly: Go to an emergency room, urgent care clinic, your primary care doctor, or a chiropractor, a licensed provider who can document musculoskeletal injuries, including whiplash and soft-tissue damage.
San Mateo Medical Center’s emergency department serves the area and provides emergency care. Do not wait to see whether the pain resolves on its own. Delayed symptoms, especially after rear-end crashes, are common, and a gap in treatment creates an opening for insurers to argue your injuries weren’t caused by the crash.
- Document the Scene Thoroughly: Photograph vehicle damage, license plates, skid marks, lane markings, traffic signals, and any visible road defects. If your crash occurred at the US-101/SR-92 interchange or another freeway location, note the exact milepost marker or nearest signage. That detail matters for identifying which agency (Caltrans vs. the county) maintains that segment.
- Collect Witness Contact Information: Names and phone numbers from bystanders or other drivers who stopped are often the most persuasive evidence in a disputed-fault case.
- Preserve Dashcam Footage Immediately: Dashcam recordings can overwrite within hours. Download and store the file as soon as possible, and consider sending a legal hold notice to any nearby businesses whose security cameras may have captured the crash.
- Avoid Recorded Statements to the Other Driver’s Insurer: You are not required to give a recorded statement to the other party’s insurance company. Because the statement may be used when evaluating liability, coverage, or damages, consider obtaining legal advice before agreeing to one.
Deadlines For Filing A Claim After A San Mateo Crash
California law sets firm deadlines for pursuing compensation after a traffic crash, and missing them can permanently end your right to recover. The applicable deadline depends on who caused your injuries.
- Standard Personal Injury Deadline: Under California Code of Civil Procedure (CCP) § 335.1, you generally have two years from the date of your injury to file a lawsuit. If your case settles before suit is filed, this deadline still governs your negotiating leverage. Cases filed in San Mateo County proceed through the San Mateo County Superior Court, Civil Division. Filing requires a Civil Case Cover Sheet (CM-010), a Summons, and a Complaint, with fee information available at sanmateo.courts.ca.gov.
- Government Entity Deadline: If your crash may have involved a Caltrans road defect on US-101 or SR-92, a malfunctioning signal maintained by San Mateo County, or any other public agency failure, a separate and much shorter deadline applies. Under Government Code § 911.2, you must file a formal government claim before you can sue.
For San Mateo County, that claim is filed with the Clerk of the Board, which refers it to the County’s Risk Management division for investigation. This process typically takes six to eight weeks. For claims involving Caltrans, the proper filing office depends partly on the amount claimed.
Claims of $12,500 or less generally require submitting a DOTLD-0274 form to the appropriate district claims office, while claims exceeding $12,500 generally must be filed through California’s Government Claims Program.
If the agency does not respond or formally act on your claim within 45 days of submission, the claim is deemed rejected by operation of law, and you generally have two years from the date of injury to file suit.
Missing the government claims deadline does not just slow your case — it can bar it. This is why it is critical to move quickly after a crash on US-101 or SR-92: the six-month government claims window can close before the standard two-year deadline even becomes relevant.
Arash Law handles government-entity claims and standard personal-injury cases throughout the San Mateo-San Francisco Peninsula. Call (888) 488-1391 for a free case review today.
Arash Law Case Results: Freeway & Intersection Injury Claims
Though the following verified Arash Law case results, drawn from the firm’s published case results page, don’t guarantee future outcomes, they reflect how our firm can assist victims of freeway and intersection crashes in San Mateo:
$3,500,000 — Car Accident: Rear-End Collision at a Red Light Leading to Spinal Surgery. The client was stopped at a red light when a distracted driver violently rear-ended the vehicle, causing severe spinal injuries that required surgery. The case was settled just three days before the trial was set to begin.
$1,300,000 — Auto vs. Auto: Multi-Vehicle Freeway Pileup. A multi-vehicle pileup on the freeway, including a vehicle that caught fire, led to more than three years of litigation before the firm secured the maximum available compensation for its client.
Compensation You May Be Able To Recover After A Crash In San Mateo
The losses that follow a serious freeway or intersection crash extend beyond the immediate emergency room bill. California law allows you to seek compensation across a broad range of economic and non-economic losses, subject to the facts of each case.
Economic damages cover documented financial losses, including:
- Emergency room treatment, surgery, and hospitalization costs.
- Follow-up care, physical therapy, chiropractic treatment, and rehabilitation.
- Future medical expenses if your injuries require ongoing care.
- Lost wages during your recovery.
- Reduced earning capacity if the injury permanently affects your ability to work.
- Vehicle repair or replacement.
- Towing and rental car expenses.
Non-economic damages compensate for harm that doesn’t have a fixed price, including pain and suffering, emotional distress, loss of enjoyment of daily activities, and the impact of permanent scarring or disability.
If a crash caused a fatality, the decedent’s surviving spouse or registered domestic partner, children, certain descendants, and other persons who qualify under California Code of Civil Procedure § 377.60 may be able to pursue a wrongful death claim.
Multiple insurance policies may apply to a single crash. Depending on the facts, recovery may draw from the at-fault driver’s liability policy, your own uninsured motorist (UM) or underinsured motorist (UIM) coverage, a MedPay policy, your health insurer’s benefits, or a commercial carrier’s policy if a business vehicle was involved. Provider liens and health-plan reimbursement or subrogation claims may affect the net amount a claimant receives. An attorney can negotiate those liens as part of resolving your case.
Frequently Asked Questions About San Mateo Traffic Accidents
After a collision at a San Mateo freeway interchange or intersection, you may be navigating insurance calls, medical appointments, and work absences all at once.
What Happens If A Driver Rear-Ends Me At The US-101/SR-92 Interchange?
Rear-end crashes at the US-101/SR-92often result in a negligence inference against the following driver under Vehicle Code § 21703, which requires drivers to maintain a safe following distance. However, fault may also lie with the driver in front, depending on the facts. For example, if you brake suddenly and do not give the driver behind you time to stop, you may be partially liable for the resulting collision.
Even if investigators find you share some responsibility, California’s pure comparative fault rules mean your recovery is reduced by your share, not eliminated. Freeway accident attorneys can request the CHP collision report for your crash and evaluate the specific circumstances.
Can I File A Claim Against Caltrans Or San Mateo County For A Road Defect On US-101?
You can file a claim against Caltrans or San Mateo County for a road defect on US-101, but the claims process is different, and the deadline is shorter. You must first file a government tort claim, a formal written notice, with the responsible agency before you can sue. For Caltrans claims of $12,500 or less, they are generally submitted through the online portal at dot.ca.gov. Claims exceeding $12,500 must be filed with the Department of General Services (DGS) Government Claims Program at dgs.ca.gov.
What If The Driver Who Hit Me Had No Insurance?
Your car insurance may cover you through Uninsured Motorist (UM) coverage. California law requires insurers to include Uninsured Motorist (UM) coverage in every automobile liability policy unless the policyholder explicitly rejects it in writing. A UM claim is filed with your own insurer, and you may seek the same categories of compensation, medical expenses, lost wages, and pain and suffering that you would pursue against an at-fault driver. If the at-fault driver had insurance but not enough to cover your losses, Underinsured Motorist (UIM) coverage on your own policy can bridge the gap.
How Does Chiropractic Care Fit Into A Traffic Accident Claim?
Chiropractic care is a recognized form of treatment for the musculoskeletal injuries that commonly result from rear-end and sideswipe crashes, including whiplash, cervical strain, lumbar sprains, and soft-tissue damage. Treatment records from a licensed chiropractor document the nature and duration of your injury and connect it to the crash.
Those records may help document the treatment you received. Still, compensation for chiropractic expenses depends on whether the care was reasonably necessary, related to the crash, and supported by admissible evidence. Records from San Mateo Medical Center or other treating providers in the county will likely be requested by the opposing insurer and reviewed in any San Mateo County Superior Court proceeding. Consistent, documented treatment strengthens the evidentiary link between the crash and your injuries.
What Should I Bring To An Initial Consultation With A Traffic Accident Attorney?
When attending an initial consultation with intersection accident attorneys, bring whatever relevant documents you have. Key items include:
- The San Mateo Police Department report or the CHP report, depending on where the crash occurred.
- Photos from the scene.
- Insurance cards and policy declarations.
- Medical records or billing statements.
- Pay stubs or employer documentation if you missed work.
- Any correspondence from insurance companies.
If you received a request for a recorded statement from the other driver’s insurer, bring that too. Do not give the statement before speaking with an attorney.
Do Lawyers Only Get Paid If They Win A Traffic Accident Case?
Yes, if lawyers work on a contingency fee basis. Under this arrangement, you pay no upfront legal fees, and the firm only receives attorney’s fees if it recovers compensation for you through a settlement or court judgment. A written agreement must explain how costs are handled and whether the client may be responsible for any costs.
Talk To Arash Law After A San Mateo Freeway Or Intersection Crash
A collision at the US-101/SR-92 interchange or anywhere on San Mateo’s high-volume corridors can trigger a chain of decisions about medical care, insurance statements, evidence preservation, and legal deadlines. These decisions can happen faster than most people are prepared for. Insurance companies move quickly after crashes, and early statements can shape how a claim resolves.
Arash Law investigates traffic crashes throughout the Peninsula, gathers collision reports and physical evidence, identifies every potentially liable party (including public agencies subject to the Government Claims Act), and handles all communications with insurers on behalf of clients. AK Law’s attorneys can evaluate the full scope of your economic and non-economic losses and explain what California law allows you to pursue.
Reach Arash Law at (888) 488-1391 for a free and confidential initial consultation. Our hotline is available 24 hours a day. There are no legal fees unless we recover for you.
About This Page
This page was prepared by Arash Law and last reviewed in July 2026 by Arash Khorsandi, Esq. (California State Bar #249405). Crash location data is drawn from the California Highway Patrol’s 2025 California Crash Reporting System (CCRS) dataset, available at data.ca.gov. Deadline and court-filing information are sourced from the California Judicial Branch Self-Help Center, the San Mateo County CEO’s office, the Caltrans damage claim portal, the San Mateo County Superior Court civil division, and San Mateo Medical Center emergency services. This page is updated when source materials change or when new CCRS data becomes available.
Case results depend on individual facts and circumstances. Prior results do not guarantee a similar outcome. This page is for general informational purposes only and does not constitute legal advice.
Sources
- California Highway Patrol – California Crash Reporting System (CCRS), Crashes_2025 dataset. data.ca.gov. Accessed July 13, 2026. https://data.ca.gov/dataset/ccrs/resource/9f4fc839-122d-4595-a146-43bc4ed16f46
- California Judicial Branch Self-Help Center – Deadlines to Sue Someone (CCP § 335.1). selfhelp.courts.ca.gov. Accessed July 13, 2026. https://selfhelp.courts.ca.gov/civil-lawsuit/statute-limitations
- San Mateo County CEO – Claim Against the County Form (Government Claims Act, 6-month deadline). smcgov.org. Accessed July 13, 2026. https://www.smcgov.org/ceo/claim-against-county-form
- California Department of Transportation (Caltrans) – Submit Damage Claim Portal. dot.ca.gov. Accessed July 13, 2026. https://dot.ca.gov/online-services/submit-damage-claim
- California Legislature – Government Code § 911.2 (6-month government claim deadline). leginfo.legislature.ca.gov. Accessed July 13, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV§ionNum=911.2
- San Mateo County Superior Court – File a Civil Case (CM-010, Summons, Complaint, fee schedule). sanmateo.courts.ca.gov. Accessed July 13, 2026. https://sanmateo.courts.ca.gov/divisions/civil-division/file-civil-case
- San Mateo County Superior Court – Courthouse Locations. sanmateo.courts.ca.gov. Accessed July 13, 2026. https://sanmateo.courts.ca.gov/locations
- San Mateo Medical Center – Emergency Services. smchealth.org. Accessed July 13, 2026. https://www.smchealth.org/smmc-services-emergency
Disclaimer
This page is provided for general informational purposes only and does not constitute legal advice. Reading this page does not create an attorney-client relationship with Arash Law or any of its attorneys. The law varies by jurisdiction and by the specific facts of each case. You should consult a licensed California attorney for advice about your individual situation. Case results depend on individual facts and circumstances. Prior results do not guarantee a similar outcome.
