This "document was prepared in 2008-2009. In addition to field reviews and available research, significant information was obtained from public opinion and concerns voiced during the public and Citizen Advisory Committee meetings held along the route. The primary objective of this report is to document desired efforts along the Fredonia-Vermilion Cliffs Scenic Road that will sustain its resources for future generations. Additionally, this document fosters the necessary relationships required to promote and protect the intrinsic qualities that define this scenic road experience."--Foreword

Project Summary

Passing and climbing lanes provide additional lanes for vehicles to safely pass other vehicles while maintaining speeds. Implementing passing and climbing lane projects provides traffic operational and safety benefits at a cost that is far less than fully widening a highway. In an effort to enhance safety and mobility on Arizona's roadways, the Arizona Department of Transportation is currently updating the 2003 Passing and Climbing Lanes Prioritization Study. This update intends to further refine the identification and prioritization methodology previously utilized and to develop a prioritized list of candidate locations that would provide the most benefit to the traveling public.
Study Objectives

    Review previous studies and research current best practices.
    Analyze the safety and performance benefits of passing/climbing lanes constructed since the previous study.
    Develop a revised methodology and ranking criteria.
    Obtain feedback from ADOT District Engineers and other stakeholders, such as rural COGs and MPOs.
    Develop a new prioritized list of candidate passing/climbing lane projects. 
 

Composite materials using asphalts, mineral dusts, and a class of chemical coupling agents known as reactive silanes are prepared for use as binders in paving construction where asphalt alone is in general use at the present. The report describes how these coupling agents may, in very low concentrations, react with both asphalts and mineral dust fillers at the interfaces of their mixtures to integrate them into new materials which may appropriately be termed composite materials. Differing asphalts, mineral fillers, and silanes are considered. Also, wide ranges in composition and differing manufacturing methods are described. The report leads through a series of phases in development and characterization of composite products and in the evolution of the concepts and criteria felt by the author to be required for manufacture and control of superior composite binders.