Originally Posted by Magic Bus

JC, I appreciate the fact that you agree with me that someone who is speeding has liability in an accident.

Here's what you and 37zero may have overlooked. While the dash cam video itself cannot determine the speed of the Z, the data that it recorded can be analyzed to determine the speed of the Z with very good accuracy. Here's how.

Authorities will pick a landmark starting point for the Z from the video. From that landmark point, they will then measure the distance to the point of impact for the 2 cars. Review the video again to determine the amount of time it took the Z to travel the distance between these 2 points. Input these factors in a time and distance calculator and your mph will be calculated.

Let's use 1087's link of this video (1st video for accident) for me to explain. Right at the 3 second mark in the video (bottom time on screen) the Z overtakes the video cam car on the left. It passes a small street and a white sign on the left of it, lets use that sign as the landmark starting point. At right around the 9 second mark, we see the collision then hear the driver say "boom".

So 6 seconds from landmark starting point to collision point. Now if this distance was 220 yards (1/8 mile), her speed was 75 mph. If 250 yards, speed is 85 mph. Obviously, the shorter the distance, the slower her speed.

I think this should explain it pretty clearly and in the other video where the police said she was over 30 mph above the speed limit, indicates to me that they have already done their preliminary calculations. Then include the fact that she was on her cell phone, gives the prosecuting attorney a solid case.