The Fay Engineering Intersection Calculator presents two versions of this intersection accident, and allows the user to compare them interactively. This case involved the allegation that a political sign obstructed a car driver's view of an oncoming pickup.
To operate the calculator, choose a speed for the vehicle and then drag the slider bar to advance or rewind the timeline. The green dot shows the currently chosen speed. Clicking on the nighttime driver's view box in the upper left corner will enlarge that view.
Clicking the "Display Details" checkbox activates a "Shadow" that demonstrates which part of the road is hidden from the driver by the sign, and makes the sign transparent in the driver's view box.