In this book, Chapter 1 will introduce various types of transportation big data, and the challenges in the transportation big data analysis; Chapter 2 will introduce the data structures and the data properties of common transportation big data; Chapter 3 will introduce the preprocessing methods of transportation big data; Chapter 4 will introduce some useful tools for analyzing transportation networks and human mobility; In Chapter 5, the advantages of data fusion approaches will be discussed, and four transportation data fusion cases will be introduced; and finally Chapter 6 will introduce five transportation big data applications to strengthen readers' understanding of the methods presented in Chapters 2, 3, 4.