Once the package is downloaded, even without an issued key an Operations Manual is available. Pending your review of that document,  here are briefly described the inputs which will (with key) drive the program.

The algorithm is input-configured as well as input-driven, meaning that the configuration of the impact between two moving vehicles need not be menu-defined; the available Site, Vehicle, and Damage Data is merely entered and the program is run. When there is either no known Site Data or no known Damage Data, these entries are left blank; the solution then proceeds to the extent possible absent the missing data. An Options Menu provides for impact with a Stationary Vehicle or an Immovable Barrier.

All inputs are in two columns (or four, for contour data), one (or two) for each vehicle. There are pop-up explanations at each field. As shown the Site Data requested is Cartesian data for 3 points along the trajectory, with X nominally North and Y nominally East. These three points are positions of the vehicle mass center At Impact, After Spin, and After Runout (non-spin). Either of the latter two points may be absent, denoting respectively no spin or no runout. Path curvatures are defined by offsets from the path chord, mid-spin and mid-runout. The Heading at Impact (which defines also the Approach Direction unless otherwise specified) and the Concluding Heading denote the initial and final chassis angular positions from North, with (at the end) full turns included. On occasion there may be a known Approach Yaw Rate (due to a prior impact) and/or a Concluding Speed (due to a subsequent impact).

Vehicle Data is always needed, although default values are furnished if the weights alone are entered. The Vehicle Data consists of Vehicle Weight at impact, Wheelbase, Mass Dispersion (k2/ab; the radius of gyration squared divided by the product of the portions of the wheelbase forward and aft of the mass center), the Tire Friction (mu), and the Relative Braking (as a fraction of mu). The latter three inputs are nondimensional.

With another option Imperial or Metric units of measurement may be selected, whereupon the transform is instantaneously adopted and applied to all data already entered. This allows mixed entry of data (some Imperial and some Metric). Calculations are always performed in the last designated system of units; they are not computed in one system and then converted to the other. NEXT