Using Tru-Traffic you can quickly develop either type arterial timing diagram for an artery, a set of intersecting arteries, or a signalized network. You may view the entire diagram or set of diagrams on the screen at once. You can easily adjust any parameter (cycle length, offset, phase sequence, splits, scales, green bands, volumes, etc.) for any intersection as often as desired, and instantly see the effects of the change. Thus, you can quickly optimize the parameters. On time-space and time-location diagrams, it automatically adjusts the green bands to show the traffic flow. On platoon-progression diagrams, it shows the flow density and queue lengths, much like the diagrams of PPD, the TRANSYT-7F post processor (except that the parameters may be changed interactively with the mouse or cursor keys, and the diagrams are displayed on the screen rather than just on the printer).

Tru-Traffic allows multiple timing plans and handles signalized networks or intersecting arteries by allowing multiple diagrams, each in its own diagram window, and each representing a different artery. The common intersections are "linked" across diagram windows so that you may edit the parameters in any diagram window, and Tru-Traffic ensures that the common parameters between linked intersections stay concurrent.

You may connect a GPS Receiver to your computer and let Tru-Traffic track position and speed. Use an optional remote control device or speech-recognition to control the GPS data collection while driving. The collected information may be used to:

• Calculate the distance between intersections,
• Lay out the Network View with high accuracy,
• Display your current location in time and space on the diagram window and in the Network View,
• Predict whether you will arrive at the next signal during the green time, and
• Record Trip Logs of travel along the artery. Trip Logs can be

• Plotted as trajectories on the diagram windows, graphically showing where delay occurs, which signals you're stopped at, and where you enter or leave the green bands. Before and after trip logs may be recorded in the same diagram data file, and you may select which ones are visible at any moment.
• Used to prepare comparative Travel Time and Delay Reports, which can be extended with user-defined formulas and can be easily be copied and pasted into word-processing documents or spreadsheets for detailed analysis. These can be powerful tools of analysis for determining the effectiveness of a timing plan.
• Plotted as Speed vs. Distance or as Time vs. Distance plots
• Played back as a movie showing progress through signal timings diagram or over Network View
• Saved as an *.AVI Video Clip
• Used to measure the actual travel distance between intersections.
• Used to calculate the "optimal" relative offset between intersections for a given direction of travel.
• Used to calculate the actual average speed between intersections.
• Used to color-code the links on the Network View according to a summary of the average link speed.