# Why is space mean speed less than time mean speed?

**mean**is always

**lower than**the arithmetic

**mean**, and also as observed ,

**space mean speed**is always

**lower than**the

**time mean speed**. In other words,

**space mean speed**weights slower vehicles more heavily as they occupy the road stretch for longer duration of

**time**.

Furthermore, what is time mean speed and space mean speed?

In simple terms, the **space**-**mean speed** is the distance traveled divided by an **average** travel **time**, whereas the **time**-**mean speed** is an **average** of individual vehicle **speeds**. **Space**-**mean speeds** weight slower vehicles' **speeds** more heavily, as the slower vehicles are within the segment of interest for a longer period of **time**.

**speed**measured is known as Spot

**Speed**. Journey

**speed**is the distance divided by total journey time. Total journey time includes all delays due to

**traffic**.

**Running speed**is the distance divided by

**running**time, i.e. total journey time minus delays.

Keeping this in consideration, what is free speed?

The point C refers to the maximum density and the corresponding flow is zero. OA is the tangent drawn to the parabola at O, and the slope of the line OA gives the **mean free** flow **speed**, ie the **speed** with which a vehicle can travel when there is no flow.

A **time**–**space diagram** is commonly used to solve a number of transportation- related problems. The **time**-**space diagram** is a **graph** that describes the relationship between the location of vehicles in a traffic stream and the **time** as the vehicles progress along the highway.