A series of field reports by the Planning and Research Division of the Colorado Department of Highways, beginning in May 1978 and ending in October 1978 on two different projects on recycling hot mix bituminous pavement. One project reported on was on I-80 west of Laramie, Wyoming. The second set of reports are on a recycling project outside of Buena Vista, Colorado. Includes discussion on methods and equipment used and the results of the various techniques.