ACTAR Study Guide 2026
Everything you need to pass the ACTAR exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 ACTAR Exam Format at a Glance
📚 ACTAR Topics to Study (71)
✍️ Sample ACTAR Questions & Answers
1. Which formula correctly relates time, distance, and constant acceleration for a vehicle starting from rest?
For a vehicle starting from rest under constant acceleration, d = ½ × a × t² is the correct kinematic equation.
2. During a collinear rear-end collision (both vehicles traveling in the same direction), which formula correctly represents the conservation of momentum?
Conservation of momentum requires that the total momentum before impact equals total momentum after: m₁v₁ + m₂v₂ = m₁v₁' + m₂v₂' (with consistent sign convention).
3. Which personal protective equipment (PPE) principle applies to ALL ACTAR certified professionals regardless of their specific role?
Regardless of experience level or specific role, PPE must be properly fitted to the individual, regularly maintained in good condition, and replaced when worn or damaged. Improperly fitted or degraded PPE can provide a false sense of security.
4. What is 'yaw rate' and how is it used in accident reconstruction?
Yaw rate is the angular velocity of the vehicle about its vertical (z) axis; modern EDR systems record it and reconstructionists use it to determine vehicle rotation during pre-crash maneuvers.
5. In a rear-end collision analysis, which factor most directly determines whether a following driver had adequate time to perceive and react to a lead vehicle braking?
TTC at brake light activation determines whether the following driver had sufficient margin (typically ≥ PRT + braking time) to avoid collision.
6. A roadway has a 4% upgrade followed immediately by a 2% downgrade. What is the A-value at this crest?
A = |G1 − G2| = |4 − (−2)| = 6%; the algebraic difference accounts for sign change at a crest.