Creedon & Gill  MVA Reconstruction Formulas

The pages linked to here require your browser to run JavaScript for the calculations. If they don't work check your options menus. You won't need to do any converting by hand between MPH and Feet per Second or anything like that. It's all done for you. The following introduction is simply for your convenience.
STOPPING TIME AND DISTANCES SKID MARKS YAW MARKS
DEBRI FIELDS THROW DISTANCES AVOID OBSTACLE IN ROAD
POLE IMPACT, CRUSH DEPTH LANE CHANGES
INTRODUCTION
Collisions between Motor Vehicles, Pedestrians and Cyclists are governed by some simple rules. Most reconstruction formulas are a function of velocity, reaction time and a measure of a road's friction called its drag co-efficient, or drag factor. Gravity, along with the condition of the road's surface, dictate the drag number. The simplest way to understand a roads drag co-efficient is to know that if you need 80 pounds of force to drag a 100 pound sled along a road, the roads drag co-efficient is .8 Gravity also dictates how far a launched object, like a motorcycle driver, flies before coming back to land. On Earth the gravitational constant is usually expressed as 32.2. In calculating Velocities, Miles per hour are often converted into feet per second for use in these formulas by multiplying by them by 1.45. For instance at 50 Miles per Hour a vehicle is going about 75 feet per second.Reaction times measure how long a motorist takes to perceive a threat, decide on an action and undertake it. Studies have shown that 10% of people need less than .88 seconds to react, 50% less than 1.04 and 90% less than 1.27 seconds in controlled experiments for simple braking.