For those with access to IEEE Intelligent Transportation Systems online, PATH researcher Steven Shladover has written a 20 year retrospective of the organization. The abstract reads thusly:
The California Partners for Advanced Transit and Highways (PATH) Program was founded in 1986, as the first research program in North America focused on the subject now known as intelligent transportation systems (ITS). This paper reviews the history of the founding of PATH and of the national ITS program in the U.S., providing perspective on the changes that have occurred during the past 20 years.
Schladover explains well the significance of 20 years for the booming ITS field and some of the generational shifts that have occurred since its inception.