A number of state transportation agencies, such as California, Massachusetts, Arizona, Indiana, Texas, and Arkansas, publish their historical transportation construction and maintenance cost data online. In some cases, these data include the prices of individual pay items of the winning bid as well as those of the engineer’s estimates. At a national level, pay item data are available through AASHTO’s Trns.prt Estimator, an interactive Windows-based stand-alone cost estimation system for highway construction. For analysts who are interested in the prices of raw materials, labor, materials, and equipment use, the Federal Highway and Transit Administrations’ Web sites, have useful data that track trends in prices. This database is made possible through continual reporting to the FHWA and FTA, cost data from the states that cover key work items and materials. The FHWA publishes bid price data in its quarterly Price Trends for Federal-Aid Highway Construction and in its annual Highway Statistics series.