Fundamentals of Transportation

As part of our Simulating Transportation for Realistic Engineering Education and Training NSF project, we have been assembling an active textbook. The book, Fundamentals of Transportation , is part of the wikibooks project, and aims to provide pages that provide an introductory and fundamental look at transportation, targeted at the undergraduate Introduction to Transportation course.
As a wikibook, it is editable by anyone, however unlike wikipedia, we aim to keep the contributors known. If you have additions, corrections, and improvements to make, please do so, but please use your real name so we know who you are (at least on your user page) (or email me identifying yourself if you really need to be web anonymous. Additional resources, good diagrams, better explanations, problem sets, etc. are welcome. All need to meet the wikibook standard of being licensable under the GNU Free Documentation License. Anything you create and are willing to license is fine, as is public domain. Copyrighted material is not, without permission of copyright holders.
From a quality perspective, this book needs to be appropriate for an undergraduate textbook, so the difficulty level should be tuned to that. Of course, it also needs to be correct or true to the best of our knowledge.
Comments are welcome.