Human Factors in Intelligent Transportation Systems

By Woodrow Barfield; Thomas A. Dingus | Go to book overview
Estimation Procedures. Survey data also can provide estimations for the target population. The following estimations can be calculated on transportation survey data:
The overall population of people who will use real-time information as an in-vehicle traveler information system
The population of people willing to choose alternate routes when they drive
The population of people who use media information when choosing alternate routes
The population of people who are highly stressed in various situations
The population of people who use specific roadside information

In the surveys conducted in 1993, for each estimate, the population distribution by gender, age, income, private drivers, commercial drivers, and dispatchers also were needed. Because the population was divided into distinct populations, separate stratum statistics for private drivers, commercial drivers, and dispatchers were also calculated. Each stratum was then subdivided into various socioeconomic levels. This reduced the variance of the sample estimate and provided the required subpopulation estimates for the study.

An initial analysis of the survey data may also provide some direct correlations between variables. If the correlation coefficient, r, is close to one, a ratio estimation may be performed in addition to the stratified sampling estimate.


SUMMARY AND CONCLUSIONS

The general issue of how to design motorist information to impact a target audience is closely tied to the type of motorist information available and our understanding of the behavior and decision-making characteristics of the target commuters. Therefore, it is very important to understand the needs of the motorists by receiving feedback from them. Surveys provide a very effective means of collecting information that is pertinent to the design of a motorist information system. Conclusions drawn then become the basis for converting traffic data into motorist information. Furthermore, surveys help to limit the scope of future in-laboratory and on-road experiments and help to identify specific focuses for future studies.

In conducting a survey, sources of bias are usually apparent. It is important to make an attempt to recognize these sources of bias and then try and avoid them. For example, in the Ng et al. ( 1995) surveys, a high number of nonresponders was expected owing to the size of the surveys (7 to 11 pages).

-320-

Notes for this page

Add a new note
If you are trying to select text to create highlights or citations, remember that you must now click or tap on the first word, and then click or tap on the last word.
One moment ...
Default project is now your active project.
Project items

Items saved from this book

This book has been saved
Highlights (0)
Some of your highlights are legacy items.

Highlights saved before July 30, 2012 will not be displayed on their respective source pages.

You can easily re-create the highlights by opening the book page or article, selecting the text, and clicking “Highlight.”

Citations (0)
Some of your citations are legacy items.

Any citation created before July 30, 2012 will labeled as a “Cited page.” New citations will be saved as cited passages, pages or articles.

We also added the ability to view new citations from your projects or the book or article where you created them.

Notes (0)
Bookmarks (0)

You have no saved items from this book

Project items include:
  • Saved book/article
  • Highlights
  • Quotes/citations
  • Notes
  • Bookmarks
Notes
Cite this page

Cited page

Style
Citations are available only to our active members.
Buy instant access to cite pages or passages in MLA, APA and Chicago citation styles.

(Einhorn, 1992, p. 25)

(Einhorn 25)

1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

Cited page

Bookmark this page
Human Factors in Intelligent Transportation Systems
Table of contents

Table of contents

Settings

Settings

Typeface
Text size Smaller Larger Reset View mode
Search within

Search within this book

Look up

Look up a word

  • Dictionary
  • Thesaurus
Please submit a word or phrase above.
Print this page

Print this page

Why can't I print more than one page at a time?

Help
Full screen
/ 458

matching results for page

    Questia reader help

    How to highlight and cite specific passages

    1. Click or tap the first word you want to select.
    2. Click or tap the last word you want to select, and you’ll see everything in between get selected.
    3. You’ll then get a menu of options like creating a highlight or a citation from that passage of text.

    OK, got it!

    Cited passage

    Style
    Citations are available only to our active members.
    Buy instant access to cite pages or passages in MLA, APA and Chicago citation styles.

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn, 1992, p. 25).

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn 25)

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences."1

    1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

    Cited passage

    Thanks for trying Questia!

    Please continue trying out our research tools, but please note, full functionality is available only to our active members.

    Your work will be lost once you leave this Web page.

    Buy instant access to save your work.

    Already a member? Log in now.

    Author Advanced search

    Oops!

    An unknown error has occurred. Please click the button below to reload the page. If the problem persists, please try again in a little while.