iPhone Crash Detection and Collision Reconstruction
Apple’s iPhone 14 has a new feature called crash detection. This feature is designed to detect when a user has been involved in a car accident and assist in alerting…
Videogrammetry: Extracting Temporal Spatial Data for 3D Reconstruction
To establish the position of vehicles in space and time, two-dimensional features captured in surveillance video are reprojected to their three-dimensional locations using high density laser scan data. While surveillance…
How Bicycle-Friendly is Your Neighborhood?
May is National Bicycle Safety Month, which is an appropriate time of the year to remind riders of best practices as they bring their bicycles out of winter storage to…
Engineering Animation: Accident of 18-Wheeler and Red Sedan
Our Engineering Animations team at DJS Associates, Inc., followed methodical steps to accurately reconstruct the events that lead to an accident between an 18-wheeler and the red sedan depicted in…
Sunny Delight? Grades Do Matter When Driving
Previously, I was picking up a morning coffee, when I “ran into” a bit of a sun glare situation. More recently, I was doing a little pre-work, holiday shopping and…
Sun Glare and the Circle Game … 180 Degrees Makes All the Difference!
Speed from video, tractor-trailer off-tracking, and sun glare are topics I enjoy writing about the most. Sun glare is the topic of choice this time around. Recently, I picked up…
Always, Always, Always… Start with the Physical Evidence
As collision reconstruction engineers, we are charged with the task of applying the laws of physics to the physical evidence that remains following a collision to determine, if possible, how…
Bus v. Motorcycle Collision: Synchronized Video Demonstrative
When a surveillance camera captured an incident involving a school bus and motorcycle, the forensic science of videogrammetry and three-dimensional accident reconstruction helped determine the speeds of the vehicles and…
Speed from Video
With the growing prevalence of dashcam and surveillance cameras, the cases we get with video of the collision have increased dramatically. In just about all of these cases, we are…