Collision Avoidance Pass/Lane Change Maneuvers


Overview: Computes the Time and Distance required to complete a passing maneuver. It also computes a Lane Change during an Acceleration, Deceleration or Constant Velocity.


Entry into Module:


This module of the program is normally entered by clicking on the REC-TEC block in the upper left of the REC-TEC Window causing the drop-down menu to appear. Place the cursor on the Collision Avoidance block and click on Passing Maneuvers on the sub-menu to initiate this module.


Under certain circumstances, the user may choose to use the Files block instead of the drop-down menu approach. Selecting any file with a .PSM extension in the Dialog box accessed from either the Open Single File or Open Multiple Files block opens this module.


Selecting AutoLoad [ON] from either the Setup Menu or the AutoLoad Icon on the upper right side (third line) of the REC-TEC Window automatically loads the scenario that was on the screen when the module was closed, either individually, or when the program was closed. With AutoLoad [OFF] on the main REC-TEC Window, modules will start without loading a file.


Data Entry:


This module contains the following data entry blocks within the leftmost frame:

             Pass ( ) L ( ) R - V1 past to Left or Right of V2 (Animation output files)

             V1 Speed (I) Speed at start of Maneuver

             V2 Speed (I) Speed at start of Maneuver

             V1 Length

             V2 Length

             Lane Centers (D) Distance between Lane centers

             Separation (I) Initial Separation Distance (X-Axis) between Vehicles after first Lateral acceleration (lane change)

             Accel (V1) Initial Initial Acceleration factor (X-Axis) if V1 accelerating

             Lat. Accel (V1-1) Lateral (Y-Axis) Acceleration factor (required)

             Pass Accel (V1) Passing Phase Acceleration factor (X-Axis) Required if V1 accelerating

             Pass Accel (V2) Passing Phase Acceleration factor (X-Axis) Required if V2 accelerating

             Lat. Accel (V1-2) Return Lateral (Y-Axis) Acceleration factor (required)

             Accel (v1) Final Final Acceleration factor (X-Axis) if V1 accelerating

             Separation (F) Final Separation Distance (X-Axis) between Vehicles before second Lateral acceleration (lane change)




The output from this module consists of the repeated input variables plus deceleration rates and V1 final speed expressed in the primary and secondary configurations. Animation Output files for V1 and V2 are automatically generated.


The top frames on the right side of the screen shows the Lateral Distance Center to Center of the lanes.


The upper middle two frames show the 1st and 2nd Lane Change Phases.


(N) Lane Change Phase


             Distance: Longitudinal distance for Lane Change

             Hypotenuse: Straight line from start to completion of lane change


Combined Arcs


             Angle: Subtended Angle

             Radius: Radius of Arc


Data (N) Lane Change


             Distance: Actual Track Distance

             Time: Time required


             Speed (I): Initial Speed (Primary)

             Speed (I): Initial Speed (Secondary)


             Speed (F): Final Speed (Primary)

             Speed (F): Final Speed (Secondary)


Passing Phase:


             Distance: Distance required for Passing Phase

             Time: Time required for Passing Phase


Total Passing Maneuver


             Distance: Total Distance required for Pass

             Time: Total Time required for Pass




Several Command Buttons appear in a frame located at the lower right corner of the module Window. The Command Buttons allow the user to engage options including the option to Open and Save the data required to generate the scenario shown on the screen at the time the file was saved.


             Open .PSM File Calls up a Dialog box, which Opens any pre-existing .PSM file and displays the output results.


             Save .PSM File Calls up a Dialog box, which Saves data on the screen to files with any user-selectable filenames. This is independent of the automatic saving as LastFile.PSM of the data at the close of this module or the close of the program.


             Diagram The Diagram displays the Maneuvers plus the Speeds Times and Distances of both. [Esc] to Exit


             N This button toggles a graphical number pad on the screen that can be used to enter data into the input boxes without using your keyboard number pad. This may be useful for presentations as data entry can be accomplished using a wired/wireless mouse.