Accredited Traffic Accident Reconstructionist Passing Score 2026: Exactly What You Need to Pass

What "Passing" Actually Means on the ACTAR Exam

When candidates ask about the "passing score" for the Accredited Traffic Accident Reconstructionist credential, they're usually picturing a single number - like a 70% cutoff you either clear or don't. That's not how the Accreditation Commission for Traffic Accident Reconstruction (ACTAR) structures its exam. Instead, ACTAR's in-person proctored written examination is split into two independently scored parts, and each part has its own passing threshold. Understanding this distinction early is one of the most important things you can do before you ever open a study guide.

The preparation guide effective June 1, 2026 lays out the format clearly: 75 theory questions in Part 1, and 25 practical questions plus a scaled diagram in Part 2, for 100 questions total across the full exam day. Each part is allotted four hours, which means eight testing hours in total, plus a separate one-hour lunch break between sessions. If you're mapping out your exam-day logistics or comparing this to other testing experiences, our exam dates and scheduling guide walks through the full-day structure in more detail.

The 75% Threshold on Each Part - Not an Average

Here is the single most important fact for anyone researching the Accredited Traffic Accident Reconstructionist passing score: candidates must score at least 75% on each part of the exam. Scoring 90% on Theory does not offset a 60% on Practical. The two scores are never blended into a composite. You either clear 75% on the theory exam and separately clear 75% on the practical exam, or you do not pass that sitting.

This matters enormously for how you allocate study time. A candidate who is a strong field investigator but rusty on multiple-choice recall of formulas cannot "coast" on practical skill to cover theory weaknesses. Likewise, someone who is excellent at written theory but has never manually built a scaled diagram under time pressure cannot lean on textbook knowledge to pass Part 2. The two content areas - detailed in our exam domains guide - each demand their own dedicated preparation track.

Why No Partial Credit Changes How You Prepare

ACTAR's exam does not award partial credit. This is a very different scoring philosophy from many licensing exams that give credit for "showing your work" or landing in the right ballpark. On the ACTAR exam, a calculation with the correct method but a rounding error, a missing unit, or an answer expressed with the wrong level of precision is simply marked wrong - full stop.

This single rule reshapes how disciplined your practice needs to be. It's not enough to understand the physics of a crash reconstruction problem conceptually; you need to consistently produce final answers in the exact format ACTAR expects. That means practicing calculations start-to-finish, checking your unit labels every time, and training yourself to never submit a range ("between 35 and 40 mph") when a specific value is required.

Theory Examination (Part 1): Scoring Mechanics

Part 1 consists of 75 questions delivered as multiple-choice, true/false, and calculation items. Because this section blends recall-based questions with applied math, candidates often underestimate how much of their Theory score depends on calculation accuracy rather than memorized facts. A wrong formula recall is one missed point; a wrong final numeric answer on a multi-step calculation can cost you the same single point even if your reasoning was sound throughout, since there's no partial credit to soften the blow.

To clear the 75% threshold on Theory, you need consistent accuracy across a broad question set - not just strength in your favorite subtopics. If you want a structured breakdown of what's actually tested inside this part, our study guide organizes the theory content into a first-attempt-focused review plan.

Practical Examination (Part 2): Scoring Mechanics

Part 2 shifts format entirely. Instead of standalone questions, candidates work through a controlled-crash case and must produce a manual reconstruction diagram to scale, alongside 25 practical questions tied to that case. This section tests whether you can take real-world crash data and translate it into an accurate, properly scaled physical representation - by hand, under time pressure, with no computer assistance.

Because Part 2 is scored separately from Part 1, a candidate cannot "bank" points from strong theory performance to offset a weak diagram. Precision in your manual drawing - correct scale, correct measurements transferred accurately, clean labeling - is graded independently of how well you did on the written theory portion earlier that same day.

Units, Precision, and the Ranges Trap

One detail trips up more capable candidates than almost anything else: ACTAR requires numerical answers to include correct units and match the reporting precision specified in the guide. An answer that is numerically close but missing a unit label, or rounded to the wrong decimal place, is marked incorrect. Equally important - answer ranges are marked incorrect. If a question calls for a speed, a distance, or a coefficient, ACTAR wants one specific value reported to the expected precision, not a bracketed estimate.

This is a formatting discipline as much as a math skill. As you work through practice calculations, get in the habit of:

• Writing the unit next to every intermediate and final number, every time
• Rounding only at the final step, to the precision ACTAR specifies
• Committing to a single final value rather than hedging with a range
• Double-checking that your final answer format matches what the question is actually asking for

If you're unsure how demanding this precision standard feels in practice, our breakdown of exam difficulty discusses how the strict scoring rules affect perceived difficulty compared to more forgiving licensing formats.

What Happens If You Fail One Part

Because Theory and Practical are scored independently, it's possible to clear one part and fall short on the other. ACTAR's structure requires both parts to be passed - the preparation guide is explicit that both parts must be completed successfully regardless of earlier partial success on a prior attempt. In other words, passing Theory in one sitting does not permanently "bank" that result for a future exam attempt if you don't ultimately certify within your eligibility window with both parts cleared.

Initial eligibility lasts two years and allows up to three attempts within that window. If needed, candidates can request one additional two-year eligibility period, which also comes with up to three attempts. This gives most candidates a real runway to retake a part they fell short on, but it also means you shouldn't treat a first attempt casually - repeated attempts cost additional exam fees and calendar time. For the full mechanics of eligibility timing, see our requirements and eligibility guide.

Approved Materials and Tools During the Test

Since the passing score depends heavily on calculation accuracy, it's worth knowing exactly what tools you're allowed to use while working toward it. ACTAR permits printed bound references and laminated or sleeved resource pages, as long as they're secured in binders. Approved calculators and manual drawing tools are also permitted. What's strictly prohibited: computers, phones, smartwatches, and any electronic reference files. The June 2026 preparation guide includes the specific approved calculator list, and using an unlisted calculator model is a risk not worth taking on exam day.

This matters for your passing-score strategy because your reference materials and calculator should become part of your practice routine well before test day - not something you touch for the first time under the four-hour clock. If your binder tabs and calculator functions aren't second nature, you're spending exam minutes on navigation instead of on the calculation itself.

Building a Study Plan Around the Passing Score

Because Theory and Practical are graded separately, your preparation calendar should treat them as two projects with two finish lines, not one blended review. A simple way to structure the weeks leading into your exam is to dedicate early weeks to Theory question drills - multiple-choice recall plus calculation practice with strict unit and precision checks - before shifting later weeks to full practical case walk-throughs and scaled-diagram drawing under a timed four-hour simulation.

For a more detailed week-by-week breakdown tailored to first-attempt success, our full study guide expands on each phase, and our practice test platform lets you rehearse both question styles under realistic conditions.

Registration, Fees, and Eligibility Windows

Passing the exam is only part of the process - getting to test day requires clearing ACTAR's eligibility and registration steps first. The nonrefundable application fee is $175 for members of ACTAR participating organizations or $200 for other candidates, and the separate examination fee is $75 or $125 respectively. Eligibility itself is not automatic; ACTAR reviews documented training, education, and experience, plus at least three references, before approving a candidate to sit for the exam. Timing matters too: applications must be submitted at least 60 days before the exam, and registration must be completed at least 30 days before it. Missing these windows can push your test date back by an entire cycle, which is worth planning around well in advance. For a full cost breakdown including renewal fees, see our certification cost guide.

Once accredited, the credential doesn't stand still - renewal happens every five years, requiring 80 ACTAR CEUs and a $325 renewal fee, or alternatively retaking the complete exam for $325. Keeping your passing scores fresh in memory (and your notes organized) makes that renewal decision easier down the road. If you're still deciding whether the whole process is worth pursuing, our ROI analysis and salary guide cover the career side of that equation, and our practice exam resources can help you gauge readiness before you commit to an application fee.

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