Florida's Open Roads Policy commits state crews to putting initial traffic control on a car accident scene within 30 minutes of notification. The medical file opens on a different clock. Federal crash data and peer-reviewed injury cohorts point the same way: a meaningful minority of people hurt in traffic are still in pain, still short of full duties at work, or still in treatment two years later, long after the lane is clear and the claim has closed.
The road reopens on a public deadline. The injury does not.
Traffic agencies treat a crash as a mobility problem with a stopwatch on it, and they are right to. The Federal Highway Administration's 2023 multistate study of secondary crashes found that about half of secondary crashes occurred within 20 minutes of the primary crash. Every minute a lane stays blocked is a minute someone else can be hurt.
So the clearance clock is public, funded, and measured. The Florida Department of Transportation commits to initial traffic control within 30 minutes of notification during working hours and 60 minutes after hours, under an agreement with the Florida Highway Patrol in force since 2002.
Nothing measures the other clock.
The Centers for Disease Control and Prevention counted more than 2.8 million emergency department visits for crash injuries in 2023. An emergency department visit is a snapshot. It records what was broken that night, not what still hurts in eighteen months.
How long do the effects of a car accident actually last?
Most car accident injuries resolve within weeks, but a substantial minority do not. Roughly half of people with whiplash develop chronic symptoms, and a 2025 analysis of 82 studies put post-traumatic stress disorder prevalence among road crash survivors at 20.3 percent. Those outcomes drive costs long after the vehicle damage is settled.
The whiplash figure comes from a 2022 editorial in Frontiers in Pain Research by de Zoete, Coppieters and Farrell, which puts the share developing chronic whiplash-associated disorder near 50 percent, with about 16 percent reporting ongoing severe pain-related disability. The PTSD estimate was published in Health Promotion Perspectives in 2025, with a 95 percent confidence interval of 18.1 to 22.8 percent. Prevalence there peaked at 29.4 percent one month after the crash and fell to 18.8 percent by three months, which is the pattern that matters: the number drops, then stops dropping.
None of this means a crash is a life sentence. Most people recover, and the same cohorts that show a persistent minority also show most people back on full duties within six months. The honest reading is a split outcome rather than a uniform one. Chronic pain is the branch that most often outlives the claim, and the Frontiers authors put the severely disabled share near 16 percent, which sounds small until it is you.
Head injuries follow their own timeline. CDC recorded 214,110 traumatic brain injury hospitalizations in 2020, and notes those counts exclude the many brain injuries treated only in an emergency department, in urgent care, or not at all. A concussion that never became a hospital record can still end a career.
The $340 billion crash bill leaves out about a trillion dollars
The National Highway Traffic Safety Administration priced the 2019 crash year at $340 billion in economic cost, covering 4.5 million injured people. Medical expenses were $31 billion of that. Lost market and household productivity came to $106 billion, more than three times the medical line.
Then the same report adds quality-of-life valuation, and total societal harm reaches nearly $1.4 trillion.
That gap of roughly $1 trillion is the whole argument. It is the part of the loss that generates no invoice: the pain, the hobby you gave up, the job you can still technically do but no longer enjoy. NHTSA also found public revenues covered only about 9 percent of crash costs, around $230 per household per year. The remaining 91 percent lands on individuals, their families, and their insurers.
Most claims close before the outcome is known
Two Australian cohorts followed people with non-catastrophic road injuries and tracked both their recovery and their claims. The two timelines do not line up.
The claim figures come from Gopinath and colleagues in BMC Public Health in 2016, following 364 claimants in the New South Wales compulsory third party scheme. The work figures come from Papic and colleagues in the same journal in 2022, following 2,019 people, of whom 1,533 had paid work before the crash. Both are Australian, and Australian compensation rules differ from any US state, so read the medical trajectory rather than the scheme mechanics.
Read that way, the pattern is stark. Over half of these claims closed at twelve months. At twenty-four months, one in five people still could not work as before.
When a car accident claim needs a lawyer, and when it does not
Here is the part most legal marketing leaves out. In the Gopinath cohort, consulting a lawyer was associated with a 10.4-fold increase in the odds of a claim closing between twelve and twenty-four months, and a 21.0-fold increase in the odds of it closing after twenty-four months. Representation makes claims take considerably longer.
Longer is not automatically worse, because the cases people take to a lawyer are the serious ones, and a serious case should not be settled at six months. There is still a real cost, and the medical literature is blunt about it. A 2018 PLOS ONE review of 37 studies found compensation-process involvement associated with extended symptom duration, and identified recovery expectations as a strong predictor, with people who expected to recover doing so roughly three times faster.
A sprained wrist that is fine in a month does not need any of this.
In a car accident claim, the calculation changes when the injury has a tail: a head strike of any kind, neck pain that has not improved by six to eight weeks, symptoms that plateau instead of fading, or work you have not fully resumed. Those are the cases where settling on the insurer's timetable means pricing an injury before anyone knows its size. Every state also sets a statute of limitations, commonly two or three years from the crash date, and it can expire while symptoms are still evolving.
Check your state's deadline this week, then put a date in your calendar at eight weeks post-crash. If you are not materially better by then, you are no longer dealing with a short problem. For Colorado-specific legal information, visit The Advocates Colorado.