IRTE
Definition
Institute of Road Traffic Engineers (UK); publishes the Forensic Collision Investigation manual that governs police and expert-witness reconstruction methodology in England and Wales.
- Full name
- Institute of Road Traffic Engineers
- Jurisdiction
- United Kingdom
- Key publication
- Forensic Collision Investigation manual
- Role
- Governs police and expert-witness reconstruction methodology in England and Wales
Common questions
Why does a national engineering institute set methodology for court testimony?+
Road collision reconstruction sits at the intersection of physics, engineering and legal evidence, so IRTE's manual gives police collision investigators and expert witnesses a shared, examinable methodology that courts in England and Wales can treat as an accepted professional standard.
Does the IRTE manual apply outside England and Wales?+
It is specific to that jurisdiction's practice and courts. Other jurisdictions, including Scotland, the US and India, rely on their own professional bodies or accepted textbooks for reconstruction methodology, though the underlying physics of momentum and skid-mark analysis is shared.
Related terms
- Coefficient of Kinetic Friction (Mu)
- The dimensionless ratio of the sliding friction force to the normal force between a tyre and the road; typically 0.55-0.70 for dry...
- Coefficient of Restitution (E)
- The ratio of the relative velocity of separation to the relative velocity of approach in a collision; e = 0 for perfectly...
- Daubert Standard
- The US federal evidentiary standard (Daubert v. Merrell Dow Pharmaceuticals, 1993) requiring that expert testimony be based on scientifically valid methods with...
- Energy-Equivalent Speed (EES / Delta-V)
- The SAE J2080 metric quantifying the kinetic energy absorbed by vehicle crush deformation, expressed as the speed change equivalent; used in the...
- Event Data Recorder (EDR)
- An onboard module that records pre-crash vehicle kinematics (speed, throttle, brake, steering) in the seconds before airbag deployment; governed by SAE J1698...
- Head-Throw Distance (HTD)
- The horizontal distance from the vehicle's front bumper contact zone to the final rest position of the pedestrian's head; used in the...
- Momentum Conservation
- In the absence of external horizontal impulses, the total linear momentum of a two-vehicle collision system (sum of mass times velocity for...
- PC-Crash
- Accident reconstruction simulation software (Steffan and Moser, Austria) that models vehicle dynamics, pedestrian multibody kinematics, and collision geometry; validated against crash-test data...
- SAE J1739
- Society of Automotive Engineers standard for traffic-accident reconstruction covering momentum, skid, and crush-energy methods; the primary scientific-community reference for admissibility arguments in...
- Skid-Mark Formula
- v = sqrt(2 mu g d), where v is the pre-skid speed (m/s), mu is the coefficient of kinetic friction between tyre...
- Yaw Mark
- A curved, striated tyre impression produced when a vehicle slides at an angle to its direction of travel during a steered or...