Duration of Restart Period Needed to Recycle with Optimal Performance: Phase II

examine the duration of restart period that would be needed to recycle to the work force with optimal performance. Based on the results of this study, a second, Phase II, study was conducted between February 26 and October 31, 2010, to examine an additional experimental condition. This technical report presents the design, methods, research findings, and conclusions of the Phase II study. The most important finding was that a restart period containing two biological nights (58 hours in duration as implemented in this study), relative to a restart period with only one biological night (34 hours per the present hours of service regulations), may improve the effectiveness of the restart period for nighttime driving operations, yielding a greater potential for recovery from fatigue before recycling to the work force. This technical report may be of interest to anyone interested in fatigue and its management in commercial motor vehicle operations and other modes of transportation. This is the final report of the study. NOTICE This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The United States Government assumes no liability for its contents or the use thereof. The contents of this Report reflect the views of the contractor, who is responsible for the accuracy of the data presented herein. The contents do not necessarily reflect the official policy of the U.S. Department of Transportation. The United States Government does not endorse products or manufacturers named herein. Trade or manufacturers' names appear herein solely because they are considered essential to the object of this report. Symbol When You Know Multiply By To Find Symbol LENGTH in inches 25.4 millimeters mm ft feet 0.305 meters m yd yards 0.914 meters m mi miles 1.61 kilometers km AREA in² square inches 645.2 square millimeters mm² ft² square feet 0.093 square meters m² yd² square yards 0.836 square meters m² ac acres 0.405 hectares ha mi² square miles 2.59 square kilometers km² VOLUME Note: Volumes greater than 1000 L shall be shown in m³ fl oz fluid ounces 29.57 milliliters mL gal gallons 3.785 liters L ft³ cubic feet 0.028 cubic meters m³ yd³ cubic yards 0.765 cubic meters m³ MASS oz ounces 28.35 grams g lb pounds 0.454 kilograms kg T short tons (2000 lb) 0.907 megagrams (or " metric ton ") Mg (or " t ")