A review and evaluation of existing flexible pavement overlay design procedures, including the ARE procedure (FHWA Contract DOT-FH-11-8544) resulted in a fully computerized rational method for the design of flexible overlay of flexible pavements. The overlay method presented is a combination and modification of several existing methods and incorpor
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This report is a user's manual for the design of flexible overlays of flexible pavements. Detailed instructions are given on obtaining the necessary input data and entering this data into the completely computerized design package. The design procedure is based on fatigue cracking criterion and nondestructive evaluation of the existing pavement. In
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Author's abstract: This report identifies 24 critical issues related to pedestrian and bicycle facilities and programs, summarizes the state-of-the-art on each issue as it is contained in the published literature, and provides a concise commentary on each critical issue. A critical issue is an issue of significant and recurring importance to people
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1981-07-01
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Nationwide Personal Transportation Survey (NPTS)
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PDF
This report provides information about family trips and travel from the point of view of the family life cycle, using data from the 1977 Nationwide Personal Transportation Study. Daily travel characteristics of families in stages of four life cycles are presented. The life cycles represented include the traditional family life cycle, consisting of
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The estimation of direct runoff for ungaged watersheds is a common problem inengineering hydrology. The method of the Soil Conservation Services (SCS) is widely used due to its ease of application. Runoff estimates are based upon the soil types and land use practices occurring within a watershed. This report presents an extension of the SCS method
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XSRAIN is a computer program written to calculate flood hydrographs for ungaged watersheds by means of the Soil Conservation Service (SCS) runoff index, the curve number (CN). The curve number (CN) for a watershed is determined by the soil and land use types occurring within it. XSRAIN does not, however, use SCS equations for computing excess rainf
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The project goal was to evaluate different methods of cutting recessed skip stripe grooves, and to evaluate various pavement marking materials placed into the recesses. The project objective was to find a marking system for Washington's mountain pass highways that would tolerate snowplowing and sanding operations, studded tires, and chain wear. Thr
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The objective of this study was to determine the effect the size and weight of large trucks has on accidents and traffic operations. The effect on accidents was determined by comparing the accident rates for a variety of truck types defined in terms of configuration, size, and weight. The accident rate is obtained by dividing the number of accident
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Observations and measurements were made at 140 low volume intersections in three regions of the United States. Control type, region, location (urban/rural), geometry (3-leg/4-leg), major roadway volume and sight distance are examined to determine their individual and interactive effects on driver behavior, accident experience, and travel time. Regi
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Three bridge rail systems were evaluated by crash test as installed on a curved, superelevated downgrade alignment. Concrete safety shape barriers mounted vertical and perpendicular to the superelevation, and a tubular three beam system were evaluated. Test vehicles included an. 1800-lb (820-kg) class mini-compact car, a 2250-lb (1020-kg) class sub
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Electronic Advertising Along Highways--Concern for Traffic Safety; Traffic Controller Synchronizer--Time-Based Signal Coordination; Current Research in the United States to Evaluate Materials Used in Recycling Asphalt Pavements; A New System for Traffic Simulation; 1977 Becomes the New Base Year for FHWA’s Bid Price Index
THIS STUDY ANALYZED THE NEED FOR AND THE FEASIBILITY OF INSTALLING AN IN-VEHICLEROUTE GUIDANCE SYSTEM.<P>THE STUDY CONCLUDED THAT A SYSTEM OF APPROPRIATE DESIGN WOULD SATISFY A SIGNIFICANT PORTION OF THE NEED FOR ROUTE GUIDANCE WITH AN APPROPRIATE BENEFIT TO COST RATIO AND APPROPRIATE NET BENEFITS.
This final report summarizes state of the art research on a broad range of techniques for Residential Street Traffic Control or Traffic Management and specific case study research on applications of the TRRL-developed "road hump" on U.S. residential streets. It also summarizes findings of original research on resident preferences regarding traffic
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The effects of sloshing liquid cargo on the limit performance of articulated trucks have been investigated. The limit performances of four vehicle configurations in cornering and braking maneuvers were simulated using an augmented version of the vehicle simulation program, TDVS (Three Dimensional Vehicle Simulation). The vehicle configurations cons
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1981-04-01
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Nationwide Personal Transportation Survey (NPTS)
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PDF
This report is part of a series that presents findings from the 1977 Nationwide Personal Transportation Study (NPTS). This report describes patterns of utilization of private vehicles (annual miles driven) in 1977. Utilization is keyed to estimates provided by the household of annual mileage placed on house hold vehicles. Usage of vehicles is relat
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1981-04-01
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Nationwide Personal Transportation Survey (NPTS)
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PDF
This report is part of a series that presents findings from the 1977 Nationwide Personal Transportation Study (NPTS). This report contains average vehicle occupancy rates by trip characteristics (trip purpose, trip length, time of day and day of the week) and characteristics of households (income, number of persons, number of drivers and vehicle ow
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