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YKAAVIO - Traffic Signal Coordination
MOST INFORMATION IS IN FINNISH
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YKaavio is a free software package for planning the arterial coordination (green band) of signalized junctions. It is based on the well-known graphical method presented first time in the Finnish National Traffic Signal Planning Handbook LIVASU-1978.  

The current version of YKaavio is provided for drawing and checking the time-space diagrams of coordinated signals. Later some real planning options will be included, too

Read more about the software

INPUT DATA

Input data needed for the program: 
- Distances between junctions
- Distance between stop lines of the same junction 
- Movements (signal groups)
- Signal plans (timings)
- The objective speed of the green band

All input is given in tables. The link and junction data can be changed using the graphical or numerical interface directly on the screen
 
 

OUTPUT DATA

The program draws the time- distance diagram of the signal coordination, called green band.  Scales of the diagram can be specified free.

The diagram shows in every junction and in every link:
- junction number and name
- link length and objective band speed in both directions
- signal timings in graphical and in numerical format
- theoretical speed of the leading and lagging edges of the green band.
 

EXAMPLES

Basic Examples - two junctions

Main road in the center of Helsinki (Southern part of Mannerheimintie)

PLANNING
What is the green wave? 
How to plan a green wave?
What are the planning problems?
What else you should know?
Read more

 

 

 

 

OUTPUT  IS GRAPHICAL
The user interface of the program is grafical. It is very descriptive, so the objectives of the planning process are all the time in hands.

SEVERAL TIMING PLANS

You can draw up to 16 timing plans simultaneously. So it is easy to compare several possibilities to coordinate traffic signals.
RECENT VERSION 1.4.1
-
English version available
Language file YKaavioUK.txt
must be located to the same folder as the program file YKaavio.exe

DRAWBACKS 
- The current version of the program is suitable for drawing of the green band diagrams
 - Planning or optimising options are not yet available.


Liikenteenohjauskeskus HELSINKI Urban Traffic Control Centre