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HOW TO USE GTS

Step 1:

Input arterial data

Step 2:

Get all possible solutions

Step 3:

Select your green wave

When you use GTS for the first time you see the sample table for the arterial with 5 intersections. You can try working with it: press “Calculate” under the table and get the arterial portrait (AP) below. Then press any green asterisk in AP and get the time-space diagram (TSD) in the right. You can press another asterisk and see how the TSD changes. You can also change any entry in the Table, click "Calculate" again and see how the AP changes. 

 

Sample arterial data input table

You may want to work with your own arterial. For that press the button “New” in the upper left corner of the Table. You will be asked to specify the number of intersections in it. After that, you get an empty table of the right size. After filling the table don’t forget to save it by pressing the save icon at the top of the page.

Fill in:

                                                                                             

  • Distances. Distances between adjacent intersections can be entered in meters or feet.

  • Velocity/s. The Table allows for two vehicle velocities in the opposite directions as well as in different segments of an arterial, if necessary. Otherwise, only one velocity has to be entered. Velocities can be entered in km/h or mph. 

  • Cycle length/s. The arterial can be coordinated only if all its signals have the same cycle length. The input table though allows individual cycle lengths for each intersection. If cycle lengths are different, one has to fill the desired common cycle length in the bottom of the table. At that, the table recalculates all green and red times proportionally to the common cycle length. When all individual cycle lengths are the same, filling the desired cycle length is not necessary. 

  • Green-red split is a set of green and red light durations in the particular intersection. We recommend filling green "through" lights in both directions and red light, after which green "left" durations are calculated automatically.

 

       All durations are entered in seconds. The signals in the inbound direction are numbered from top to bottom.

Press the "Calculate" button

Step 1:

Input arterial data

Step 2:

Get all possible solutions

Step 3:

Select your green wave

Sample arterial portrait

Now you see the AP. All the coordination solutions are here.

Each green asterisk represents a pair of bandwidths that is possible in the arterial. Dark asterisks correspond to the pairs with maximal sum bandwidth. Blue circles mean that a timing plan with that pair of bandwidths does not exist.

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At the bottom of the AP you can see the total number of the pairs of bandwidths that can be organised in the arterial, the number of those with maximal sum bandwidth, and the maximal sum bandwidth itself. 

Click any asterisk

Step 1:

Input arterial data

Step 2:

Get all possible solutions

Step 3:

Select your green wave

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Red rectangles in each intersection represent red light durations. Green rectangles represent inbound light durations: the upper ones are "through" while the bottom ones are "left". Blue rectangles represent oubound light durations: the bottom ones are "through" while the upper ones are "left".

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The green waves are shown with the transparent red and blue strips for inbound and outbound directions, correspondingly. Current cycle length is marked with C in the bottom left corner of the TSD.

Explanation of the Time-Space Diagram

(What is that?)

TSD is the ultimate proof that the calculated offsets and phase sequences actually provide the chosen pair of bandwidths. That is why we take the accuracy of our diagrams very seriously. Each TSD is positioned over a grid with a 1 s step along the time axis and with a step determined by the length of the arterial along the distance axis. Thus anyone can verify the validity of the calculated timing plan.

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You can drag the diagram horizontally or zoom it in and out with the mouse wheel.

AP and TSD can be exported as PNG file, while the table can be saved as CSV.

2011:

Two-direction green wave control is difficult to achieve...

Fan S. and Ding H. (2011)

"One way green wave research"

2022:

 The existing coordinated        control methods of green 

  wave are complicated,

  difficult to operate...       

Ji L. and Cheng W. (2022)

"Method of bidirectional green wave coordinated control for arterials under asymmetric release mode"

2023:

With GTS

it is now easy!

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