Where truck accidents happen in San Dimas
Three freeways touch San Dimas, and the 57 is the one that matters most. It is the shortest route from the 10 and 60 warehouse corridors up to the 210 and the foothill cities, and from Orange County north, and its ramps at Via Verde, Covina Boulevard and Arrow Highway are where those trucks leave the freeway for the Arrow Highway industrial strip. The 210 crosses the north side with exits at Lone Hill and San Dimas Avenue, and the 10 brushes the south end at Via Verde. The county’s truck-route list for the city names Arrow, Foothill, Covina Boulevard, San Dimas Avenue, Lone Hill, Cienega, Badillo, Cataract, Via Verde and San Dimas Canyon Road, and that is where the trucks and the crashes are.
The Orange Freeway’s Arrow Highway ramps are half a mile from our office. The northbound on-ramp from Bonita and Arrow has a history: in 2023, business owners on the frontage told a television crew that nearly a dozen drivers had slid off it, mostly in rain, and asked Caltrans for a guardrail. Caltrans counts close to 14,000 trucks a day on the 57 here, and the weave between the Arrow on-ramp and the 210 interchange a mile north is short. A car merging in front of a loaded rig that cannot slow in time is the crash this ramp produces.
The Foothill Freeway’s San Dimas Avenue off-ramp shows up in the CHP’s big rig log over and over. In August 2026, a silver sedan and a big rig collided in the third and fourth lanes at the eastbound off-ramp and someone was hurt. Two weeks later a box truck lost its engine on the same stretch and spilled about twenty gallons of diesel. In September a white big rig and a Mini Cooper collided at the merge. On January 12, 2026, a Toyota sedan ended up underneath a big rig on the westbound 210 near Lone Hill and its driver was cut out and taken to Pomona Valley Hospital.
The San Bernardino Freeway’s Via Verde exit is San Dimas’s back door, serving Bonelli Park, Raging Waters and the neighborhoods south of the lake, and it sits a mile from the 10/57/71 interchange where about 17,400 trucks a day come through. Summer weekend traffic to the largest water park in California mixes with those rigs at the Via Verde ramps. In March 2025, two big rigs collided on the westbound 10 to northbound 57 connector on the Pomona side and one person died; that connector feeds directly into San Dimas.
Arrow Highway runs the length of the city a block south of Bonita, along the rail line, and it is a designated truck route from city limit to city limit. West Arrow between the 57 and Lone Hill is the industrial strip: contractors’ yards, warehouses, distributors and the businesses on the 57 frontage. East Arrow carries trucks to La Verne, the Fairplex and Pomona. Trucks backing into docks across two lanes, pulling out of yards, and running the Arrow signals at San Dimas Avenue and Cataract are the daily hazards on the street our office sits a block from.
San Dimas Avenue is the truck route from the 210 through downtown to Arrow, Via Verde and the 10, and Bonita Avenue is the main street through Frontier Village, past the Walker House, the new Metro A Line station and our office. Delivery trucks, box trucks and construction rigs share those blocks with people on foot at the station, the restaurants and the Saturday events. A truck making a wide right from San Dimas Avenue onto Bonita, or a delivery truck stopped in the lane, is where the town’s pedestrian and cyclist crashes come from.
The west side’s truck routes connect the 210 at Lone Hill and the 57 at Covina Boulevard to the industrial pockets along Cienega, Badillo and Cataract on the Covina and Glendora lines, and Lone Hill runs past the retail center on the Glendora border. These are four-lane streets with driveways, schools and left turns across traffic. A rig on a residential street between them to skip a signal is off the designated network, and the county’s route list becomes evidence when it causes a crash.
The Los Angeles County Public Works truck-route list for San Dimas names every state highway plus Foothill, Arrow, Cienega to Arrow, Covina Boulevard to Cataract, Badillo to Covina Boulevard, Puente Street, Via Verde to the freeway, Lone Hill to Covina Boulevard, Cataract from Arrow to Covina Boulevard, San Dimas Avenue in two segments, and San Dimas Canyon Road. A tractor-trailer on a street off that list to skip a signal is breaking a safety rule, and in California a safety-rule violation that causes a crash is negligence per se.
The CHP’s 2026 log for the 210 at San Dimas Avenue reads like a calendar. On August 14, a sedan and a big rig collided in the lanes at the eastbound off-ramp and the fire department responded to an injury. On August 28, a box truck with a mechanical failure spilled diesel on the shoulder. On September 18, a big rig and a Mini Cooper collided at the merge, and the next day a rig with a 30,000-pound load broke down in the slow lane and waited an hour for a heavy-duty tow. On January 12, 2026, a driver was extricated from beneath a big rig on the westbound 210 near Lone Hill.
Why a truck case is not a big car accident case
The defendant is a company with an insurer and a lawyer, the rules it broke are federal, and the proof of what happened is stored on its truck. Each of those changes how the case has to be built.
Federal rules set the standard of care
The rigs on the 57 and the 210 are mostly interstate carriers, and the Federal Motor Carrier Safety Regulations govern them. A driver gets eleven hours of driving inside a fourteen-hour day with a thirty-minute break under Part 395, must be qualified under Part 391 and tested under Part 382, and the truck has to be inspected and maintained under Part 396. When a violation caused the crash at the Arrow Highway ramp or on the 210, California treats it as negligence per se, and the carrier has to explain the violation rather than you having to prove what a careful driver would have done.
The coverage is measured in millions
A car in California can be insured for $30,000 per person, which does not cover the first day in the trauma unit at Pomona Valley. A truck over 10,001 pounds hauling general freight in interstate commerce must carry at least $750,000 under 49 CFR 387.9, and $5 million for certain hazardous loads. Most carriers add excess policies. The money is there to pay for a serious injury, and the adjuster knows it, which is why the fight is over fault and not over the bills.
More than one company is on the hook
The driver works for a carrier that may lease its tractor from one company and pull a trailer owned by another. A broker matched the load, a shipper packed it, and an outside shop signed off on the brakes. On the Arrow Highway strip, the yard the truck was leaving may be a defendant too. Each of them can share fault and each has its own policy. Finding all of them is the first job, because the carrier will try to make its driver the only one.
The evidence is on a clock
Federal rules only require a carrier to keep electronic driver logs for six months. The engine’s data can be overwritten when the truck goes back to work, and dash-cam video is deleted on a rolling schedule. The carrier’s insurer will have an investigator on the 57 the same day. We are in town, so we can be there the same day too. We send a written preservation demand to the carrier, the broker and the insurer within days, so that if evidence goes missing afterward, the jury hears why.
The evidence we lock down in the first 72 hours
The trucking company’s insurer usually has an adjuster and an accident reconstructionist on a serious crash the same day. Because our office is in San Dimas, so do we. This is what we go after.
The driver’s hours for the trip and the seven days before it. Fatigue is the most common cause nobody sees at the scene, and the log either proves it or was edited.
Speed, throttle, brake application and following distance in the seconds before impact. On a merge crash at the 210 San Dimas Avenue ramp, it answers whether the truck had room to slow and did not.
Most fleets run cameras both ways. Video of a driver on a phone coming down the 57 into the Arrow Highway exit changes a case in a single frame.
License history, medical card, prior crashes and citations, training records, and the background check the carrier was required to run before it hired this driver.
Federal rules require testing after a crash with a death, an injury treated away from the scene, or a tow. We confirm the test was done on time and get the result.
Brake and tire records, the pre-trip inspection report, the bill of lading and the weight ticket. The box truck that dumped diesel on the 210 in August 2026 had a maintenance history, and so does every truck that breaks down in traffic.
Who can be held responsible for a San Dimas truck crash
- The truck driver
- For speeding, tailgating, an unsafe merge at the Arrow or San Dimas Avenue ramps, running a signal on Arrow or Bonita, leaving the designated truck route, distraction, fatigue or impairment. California also limits any vehicle with three or more axles or a trailer to 55 miles an hour and the right-hand lanes under Vehicle Code 22406.
- The motor carrier
- The company whose USDOT number is on the door answers for its driver’s negligence and for its own: hiring a driver with a bad record, dispatching him past the hours limit, or skipping maintenance to keep the truck on the road. We check the carrier’s federal safety record before the first call with its adjuster.
- The freight broker and the shipper
- A broker that hands loads to carriers with poor safety scores can be liable for negligent selection. A shipper or a yard on Arrow Highway that loaded and sealed the trailer can be liable when a shifting or overweight load caused the crash.
- Tractor and trailer owners, lessors and maintenance shops
- The tractor and the trailer often have different owners, and a leasing company or a contract shop that signed off on worn brakes or a bad tire becomes a defendant with its own insurance.
- Manufacturers
- Brake failures, tire blowouts and trailers without proper rear underride guards support product liability claims against the companies that built or sold them. After a car-under-trailer crash like the one at Lone Hill, the guard is the first thing we photograph.
- Caltrans, the City of San Dimas or a contractor
- When a ramp with a known slide-off problem, a lane closure, a missing sign or a bad signal contributed to the crash, a government claim must be filed within six months under Government Code 911.2. We calendar that deadline the day we open the file.
After a truck crash in San Dimas: who to call and where to go
What a San Dimas truck accident claim can recover
The companies responsible for the truck owe the full cost of what the crash did to you, not the number their adjuster offers in the first week. In a truck case that usually includes:
- Emergency and hospital care the ambulance, the trauma unit at Pomona Valley, surgery, imaging and the months of physical therapy that follow.
- Future medical care a life-care plan when a brain injury, spinal cord injury or amputation will need treatment for years, often at Casa Colina down Bonita Avenue.
- Lost wages and lost earning capacity the paychecks you missed and the job you cannot go back to.
- Pain, suffering and the loss of your normal life which California does not cap in a trucking case.
- Your car and your property the vehicle, the rental, and what was inside it.
- Wrongful death damages for a spouse, children or parents under Code of Civil Procedure section 377.60, including funeral costs and the loss of the person’s support, guidance and companionship.
Under California’s pure comparative negligence rule, a share of fault reduces the recovery by that share; it does not bar the claim. Immigration status has no bearing on any of it.
