Appreciation to Robert Herman

This is the first issue of Transportation Science to be published without Robert Herman as its editor. With his typical clarity and singleness of purpose, Bob guided the Journal through its formative years. It has played an important role in developing transportation science, communicating research findings, and attracting the interest of a growing number of scientists to the study of transportation. After seven volumes, Transportation Science has obtained a secure place among scientific journals. Its success is a tribute to his foresight, high standards, and dedicated services.