What the Truck Driver Could — and Couldn't — See
3D Laser Scanning | Driver Visibility
The Situation
A passenger sedan crossed three through lanes of a divided highway and attempted to merge into a dedicated left-turn lane, pulling directly in front of a commercial dump truck that was already stopped or moving in that lane. Contact was made between the truck's front bumper and the driver's side of the sedan.
The smaller vehicle's driver insisted the truck "came out of nowhere" and ran into her. The trucking company's driver insisted he never saw the sedan enter his lane. Both drivers were telling the truth.
The Analysis
Using a terrestrial 3D laser scanner, Coastal Crash Consultants captured the dump truck's exact cab geometry, hood height, windshield angle, driver's seat position, and sightlines, in full spatial accuracy. That scan was combined with a dimensionally correct model of the sedan and placed into the reconstructed scene. From there, we reproduced the truck driver's actual eye-level view from the operator's seat, using published seated-eye-height data for a driver of his stature.
The Finding
Directly in front of the truck, objects below approximately 5'9" simply could not be seen. The sedan, with a roof height of roughly 5'0", sat entirely beneath the driver's field of view as it cut across at an acute angle to merge.
No amount of attentiveness from the truck driver would have brought that vehicle into his cone of vision before contact occurred. It wasn't a failure to look. It was physically impossible to see. From there, we reproduced the truck driver's actual eye-level view from the operator's seat, using published seated-eye-height data for a driver of his stature.
Why It Matters
What began as a "he should have stopped" case became a demonstrable visibility case, grounded not in argument, but in the truck's own measured geometry. Blind-spot and visibility disputes resolved by reproducible evidence.
Blind-spot and driver-visibility disputes are often won or lost on whether the expert can show what the operator could see, not just describe it. 3D scanning transforms a courtroom debate into a measurable, reproducible fact.