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Pedestrian Accident Reconstruction

Pedestrian collisions form a large part of the cases that are reconstructed by Crashteams in all locations. In most jurisdictions, the issues really boil down to establishing the potential of the incident for avoidance.

Pedestrian collisions can be some of the most complicated and demanding collisions for crash reconstructionists. These types of incidents typically occur in urban areas where there is a mixture of motor vehicles, pedestrians and intersections. Evidence from these types of collisions can be subtle and their relation to how the collision occurred can be complex. Hence, pedestrian reconstruction requires experts who are trained specifically in pedestrian related collisions and have a grounded understanding of scene evidence as it relates to the five main types of pedestrian collisions.

Time Distance Analysis

What opportunity did the driver and/or the pedestrian have to avoid the collision?

If either could go back in time and re-live the incident, what would they have done differently to avoid the actual outcome? Many times, it relates to visibility and time. However, it is almost always paramount to establish the speeds of both at the moment of impact. We can do that!

Crashteams experts use a combination of scene evidence and established physics procedures to pin down the impact speeds. Once that is done, we can immediately establish the positions of both at discreet time points prior to the impact. Some of those time points are critical to establishing the avoidance potential such as “ point of last opportunity “ and “ point of first perception “.  We can establish these points precisely for you and illustrate them in 2D and 3D static drawings as well as in moving animations both in 2D and 3D which are very persuasive tools. Clarifying the pre-impact positions and timing is key to success.

Types of Pedestrian Collisons

The five different types of pedestrian collisions are:

Wrap Trajectory
The most common type of pedestrian collision, which usually involves a decelerating vehicle. In this type of collision, the pedestrian’s torso wraps up onto the vehicle’s hood.

Forward Projection
This is the most common type of pedestrian collision that occurs with children. This type of collision occurs when the pedestrian’s center of mass is lower than the leading edge of the vehicle.

Fender Vault
This type of collision involves both vehicles which are braking and non-braking. The pedestrian is contacted near an outboard edge: the torso is wrapped onto the hood of the vehicle, and the pedestrian exits off of the side of the vehicle.

Roof Vault
This type of pedestrian collision occurs when a pedestrian center of mass is higher than the leading edge of the vehicle. The pedestrian is lifted into the air because of the vehicle’s speed or a low roof line. Typically, these types of pedestrian collisions are caused by high impact speeds.

Somersault
This is the least common of pedestrian collisions and is due to high impact speeds. The pedestrian is flipped into the air (or is somersaulted) before striking the ground.

Determining what type of pedestrian collision requires an analysis of the collision scene, a vehicle examination and an examination of the pedestrian’s injuries. From the analysis of these examinations, a crash reconstructionist will be able to determine how a person was contacted by the vehicle, if the person went up onto the vehicle, how the person fell to the ground, and what occurred while the pedestrian was on the ground.

3D Scene Models

Pedestrian Accident Reconstruction in 3D

All Crashteams experts are highly skilled in generating a 3D environment which accurately replicates the actual scene of the incident. This model is based on the forensic mapping procedure which creates the overall geometry of the scene precisely, and the evidence of the incident, combined with locations that have been determined by the use of physics. The end result provides the readers/court with a complete understanding the event.

Pedestrian Accident Reconstruction


The movie shown here is an actual crash captured by a red light camera. Mike Kennedy, Crashteam's senior reconstrucionist, has recreated the accident making 3D animations from different points of view to illustrate the intricate details of a pedestrian collision.

Sample animations from red light camera reconstruction

Pedestrian impacts understanding the magnitude
See sample animation

Crashteams reconstruction experts provide detailed animation reports for every 3D animation to back up visually stunning animations with data.

See sample 3D Animation Report.pdf

Steps in Pedestrian Reconstruction

Almost all pedestrian cases are reconstructed with a view to determine the possibility of the incident being avoided, given the visibility opportunities, impact speed, pedestrian motion, and motor vehicle condition.
This means that the professional crash reconstructionist must complete the following tasks:

  • Determine point of impact
  • Determine visibility issues
  • Generate accurate diagram (preferably in 3D)
  • Calculate impact speed
  • Calculate time vs position and velocity information

Once these tasks are complete, the reconstructionist can report on where the motor vehicle was located at various points in time, including where the motor vehicle was located when the first opportunity to recognize the pedestrian as a hazard occurred. From that position, the reconstructionist can predict the stopping distance based on the vehicle capability and standard perception response delay. Of course, the best way to demonstrate the results is in a 3D animation.

Pedestrian Collisions and Crashteams

Crashteams representatives have the highest level of pedestrian reconstruction training. Combined with the on-scene experience with pedestrian collisions, our Crashteams representatives will provide you with accurate and reliable analysis, which will include 2D or 3D diagrams of the pedestrian collision, speed determination of the vehicle and pedestrian (evidence permitting), calculate time vs position and velocity information, and if required, a 3D animation.

For more information call: (877) 372-3728

 

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Our Services

Crash Reconstruction

Our Crashteams reconstructionists are the most highly trained and qualified individuals in the industry.

Forensic Mapping/Scene Surveys

All Crashteams experts utilize survey equipment to produce precision crash scene diagrams and 3D models.

Expert Witnesses Testimony

All Crashteams reconstructionists are qualified expert witnesses and have given testimony at all court levels and jurisdictions.

Witness Interviews

Your Crashteams experts can interview witnesses and secure detailed statements, as recorded interviews in audio and video formats.

3D Animations

Crashteams experts are all trained and certified as forensic animators. You will find it advantageous that your reconstructionist and animator are the same person.

Crash Simulation

Crashteams experts are qualified to use many different software applications to simulate the crash for the purposes of answering what if scenarios and exposing errors in the hypotheses advanced by oppsing experts.

Rebuttal Reports

You may send us reports from opposing experts and we will be able to tell you immediately if a rebuttal is useful and if so, we produce professional, objective, commentaries.

Managed Services

Crashteams have the expertise coverage and manpower to take on all the crash investigation requirements of a community as a public private partnership.