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Time mean speed and space mean speed are two important measures of speed.
It is possible to have a relation between them and was derived in this chapter.
Also, time mean speed will be always greater than or equal to space mean speed.
The fundamental diagrams of traffic flow are vital tools which enables analysis
of fundamental relationships.
There are three diagrams - speed-density, speed-flow and flow-density.
They can be together combined in a single diagram as discussed in the last
section of the chapter.
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