For anyone who is interested, here is a blurb explaining what's new in the 4th edition of the ITE guide:
Parking Generation, 4th Edition: An ITE Informational Report
The updated publication represents a substantial change to the third edition, which was published in 2004. The report contains updated introductory material as well as updated land use descriptions, parking generation rates, equations and data plots. The fourth edition also includes a significant amount of new data; updated peak demand rates based on time of day distribution; and quantitative and qualitative information on the influence of numerous factors on parking demand rates.
Since the release of the third edition of Parking Generation, information on several land uses has been collected and added to the database. Sixteen new land use classifications and data from more than 450 new study sites are included in the fourth edition, for a total of 106 land uses.
