Time Distance

The Time Distance Application allows the Collision Reconstructionist to complete a full time distance analysis in a vehicle-to-vehicle collision.

The application is designed to perform time distance calculations in a typical path intrusion scenario where the driver of through or bullet vehicle is attempting to avoid the collision by applying the vehicle brakes.

All that is necessary to perform the base calculations is the impact speeds of both involved vehicles, the pre impact braking distance and drag factor of the through vehicle along with the driver’s perception reaction time. After these items are entered the application will establish how far the through vehicle was from the collision, in terms of both time and distance, at the driver’s point of perception.

The application then takes the time distance analysis a step further and conducts a series of “What If?” calculations. The what if calculations establish if the collision would have occurred had the through vehicle been traveling at the posted speed limit. In the event the through vehicle would not have been able to stop before reaching the point of impact the application will take into account the movement of both vehicles, to determine if there would have been sufficient additional time for the Intruding vehicle to clear the path of the Thru vehicle. If the Intruding vehicle is capable of clearing the point of impact, the distance the vehicle clears the impact by is determined.

If the collision involves a red signal, the application will perform a complete red light analysis to determine where the Through vehicle would have been from the Stop Bar, in terms of both time and distance, when the traffic signal turned both yellow and red.

The calculations are dynamic in nature, allowing the user to change any of the entered variables and to see the results of those changes instantly.

The results along with all of the related math is displayed in a line-by-line or step-by-step fashion that may be viewed from within the application or emailed, allowing results and math to be copied and pasted into any word processing program.


Price: $4.99
Languages: EN
Released: 2011-12-21 16:17:54
Version: 1.0
Seller: Charles Russell
Size: 573.65 KB


The SFST Application is an application designed to assist Officers with administering the Standardized Field Sobriety Test when stopping a driver suspected of driving under the influence.

The SFST Application has 4 basic views. The first allows the Officer to select driver observations concerning the driver’s activities when contact is first made and when they get out of the vehicle. A few of the observations that may be selected are:
-Bloodshot Eyes
-Slurred Speech
-Admitted to Drinking
-Trouble Exiting the Vehicle

The next three views are for the three Standardized Field Sobriety Test tests
-Horizontal Gaze Nystagmus (HGN)
-Walk and Turn Test
-One Leg Stand Test

On the HGN view the Officer selects whether each of the 6 possible clues are present simply by selecting a Yes/No button. Additionally, there is button to identify if Vertical Nystagmus is present, as well as the ability to identify other activity such as the driver’s inability to keep his head still, swaying during the test, etc.

On the Walk and Turn Screen there are two sets of footprints representing the nine steps the driver is to take up and then the nine steps they are to take when they return. The set of footprints on the left side of the screen are used to identify those steps where the driver failed to walk heel-to-toe. The set of footprints on the right side of the screen represents those steps where they step off the line. During the test the test the Officer simply selects the step on the screen the driver missed, at which time the selected step will turn red.
Below the footprints are other observations that may be made of the driver during the test such as;
Could not stand heel-to-toe
Started Test to Soon
Took the Wrong Number of Steps, etc.

On the One Leg Stand Test screen there is a button to identify the foot raised and four buttons for each of the four possible clues. When the option for putting their foot down is selected a text box will appear along with a plus button. Each time the plus button is pressed the counter for when they put their foot down is increased by one. As with the other two tests there are additional observations the Officer may make simply by checking the appropriate check box.

After the test and driver observations are completed the Officer selects the option to email the results. The application converts all of the observations made by the Officer into a narrative, placing the narrative into an email message they email to themselves. Upon receiving the email message the Officer simply copies the narrative from the email and pastes it into whatever program they are using to write their DUI report.

In addition to describing the results of the tests, the narrative also includes the instructions the Officer would have given to the driver, conforming to SFST manual.

There is an additional screen that includes the SFST instructions to be given to a driver.

Efforts have been made to make the narrative as detailed as possible while in a format generic enough to comply with the writing styles of theb various police agencies.


Price: $4.99
Languages: EN
Released: 2011-08-01 17:03:27
Updated: 2012-03-31 15:43:39
Version: 1.3
Seller: Charles Russell (Accident Analysis and Reconstruction, Inc)
Size: 633.68 KB


The Momentum 360 application allows the collision investigator to determine vehicle velocities in two vehicle collisions utilizing the conservation of linear momentum based on:
•Vehicle Weights (masses)
•Approach and Departure Headings and
•Any combination of 2 of the 4 involved velocities.

Unlike most traditional momentum programs, the momentum 360 application does not limit the accident investigator to using only the post impact velocities when determining speeds. Instead, the momentum 360 application allows the investigator to use any combination of the 2 impact and post impact velocities in order to solve the remaining 2 unknown velocities.

The approach and departure angles may be entered in either a clockwise or counterclockwise direction, and there is no requirement that any of the angles have to be set to 0 degrees.

All of the data may be entered directly into the application through the use of text boxes. However, ALL of the entered values may be adjusted up and down through the use of a slider. This allows the investigator to quickly determine any sensitivity issues that may be associated with the selected data simply by moving the slider, since the calculated results change instantly along with the selected data as the slider is moved.

To activate the slider, the button adjacent to the data is selected, which in-turn will highlight the selected data in red.

The main data screen displays the momentum results, the change in velocities of both vehicles (in units of mph or km/h) as well as their respective principal direction of force.

There are two additional screens. The first displays the momentum, delta v and pdof calculations in a step-by-step manner. The third screen displays additional results to include: the calculated velocities in units of fps or m/s, the impact and post impact kinetic energy of the involved vehicles along with the combined change in kinetic energy, the closing and separation velocities of the vehicles, each vehicle’s change in direction and the collision restitution.


Price: $9.99
Languages: EN
Released: 2009-11-12 17:07:46
Updated: 2011-11-10 18:19:11
Version: 2.0
Seller: Charles Russell
Size: 466.55 KB


Calculates the take-off speed of a vehicle involved in an airborne event (vault, fall or flip).
The calculated speed is displayed in both fps and mph in the Imperial System and m/s and km/h in the Metric System.
In addition to the take-off speed of the vehicle, its horizontal and vertical velocities are calculated along with the total airborne time.
The horizontal distance is entered through the use of a text box while the take-off angle and vertical distance are entered through the use of the sliders.
The vertical distance (landing height) is entered relative to the vehicle’s take-off position. Positive values indicate the vehicle landed higher than its take-off and negative values lower.
By entering the take-off angle and vertical distances via sliders, the investigator can rapidly determine the sensitivity of the data. Moving the slider changes the related value and speed calculations simultaneously.


Price: $4.99
Languages: EN
Released: 2009-10-08 21:55:04
Updated: 2010-07-29 00:31:38
Version: 2.0
Seller: Charles Russell (Accident Analysis and Reconstruction, Inc)
Size: 87.47 KB

Minimum Speed Calculations

Calculates the Minimum Speed/Velocity of a vehicle that is skidding/decelerating based on its skid distance, braking efficiency, roadway grade and the vehicle’s final/impact velocity.

Calculations are completed in fps and mph when using the Imperial System and m/s and km/h in the Metric System.
In addition to the speed calculations, the time elapsed in the skid is determined as well as the adjusted drag factor.

The coefficient of friction, vehicle braking efficiency and roadway grade, are all entered via sliders or text fields. When the slider for any of the related values is moved, both the value of the related item and all of the related calculations are instantly changed. This allows the investigator to instantly determine how sensitive the values are to the speed calculations.


Price: $4.99
Languages: EN
Released: 2009-09-26 23:41:57
Updated: 2011-11-18 22:31:44
Version: 3.1
Seller: Charles Russell (Accident Analysis and Reconstruction, Inc)
Size: 290.89 KB