Using Pavement Performance Data to Develop Mechanistic-Empirical Concepts for Deteriorated and Rehabilitated Pavements
Publication No. FHWA-RD-93-162
This report summarizes existing pavement condition indices and available prediction models for each condition index, and it also identifies existing databases, where the required variables for the prediction models have been collected. The conclusions emphasize the development of modeling tools rather than specific models.
The NTIS number for this publication is PB95-194833; the cost is $27 for a paper copy and $12.50
for the report on microfiche.
Older Driver Perception-Reaction Time for Intersection Sight Distance and Object
Detection Final Report
Publication No. FHWA-RD-93-168
Four on-road experiments investigated whether the assumed values for driver perception-reaction
time (PRT) used in American Association of State Highway and Transportation Officials (AASHTO) design equations adequately represent the range of actual PRT for older drivers.
This volume is the first in a series; the others are: Volume II (Appendixes, FHWA-RD-93-169,
PB95-231874) and Volume III (Executive Summary, FHWA-RD-93-170).
The NTIS number for this publication is PB95-199907; the cost is $27 for a paper copy and $12.50 for
the report on microfiche.
Older Pedestrian Characteristics for Use in Highway Design
Publication No. FHWA-RD-93-177
The objective of this project was to develop traffic planning and engineering guidelines for the design of pedestrian facilities that are sensitive to the needs of older pedestrians. A detailed task analysis and a literature review of motor, sensory, perceptual, cognitive, and behavioral factors were conducted to identify pedestrian tasks that are difficult for older pedestrians. Several activities were undertaken to identify specific problems that could be addressed by changes in design standards and operational practices.
It was determined that older pedestrians experience difficulties at signalized intersections and often do not have sufficient time to cross. A field study of more than 7,000 pedestrians in four cities was conducted to determine walking speed, startup time, and stride length of older pedestrians. Specific recommendations for changes to highway design and operational practices are described.
The NTIS number of this publication is PB95-199295; the cost is $27 for a paper copy and $12.50 for the report on microfiche.
An Upgrade Plan for FHWA Roadway Safety Simulation ModelsPublication No. FHWA-RD-93-189
This report reviews the current FHWA roadway simulation models and defines the key mathematical formulations. It also provides an outline for a single, common user interface that organizes and automates data communications among the models.
The NTIS number of this publication is PB95-209276; the cost is $17.50 for a paper copy and $9 for the report on microfiche.
Performance of Grouts for Post-Tensioned Bridge StructuresPublication No.
This report describes a study to identify the most appropriate grout mix for the post-tensioning application. A test program was carried out to evaluate 15 different grout mixes that had shown promise based on an evaluation of existing literature and data. As a result of this study, it was determined that the most appropriate mix for this application consisted of type I portland cement that was 20 to 25 percent silicafume by weight of the cement, potable water, and a superplasticizer.
The NTIS number of this publication is PB95-231767; the cost is $19.50 for a paper copy and $9 for the report on microfiche.
Verification of the Pressurized Flow Simulation Module (PFSM) of Storm Drain Program
Publication No. FHWA-RD-92-100
A hydraulic, laboratory model of a storm drain system was tested and used to verify results from PFSM of the Storm Drain computer program. This program is part of a larger collection of Highway Drainage (HYDRAIN) programs that have been developed under a national pooled-fund study sponsored by 30 state highway agencies.
The NTIS number of this publication is PB95-216156; the cost is $19.50 for a paper copy and $9 for the report on microfiche.
Precursor Systems Analyses of Automated Highway Systems (PSA of AHS)
Fifteen Precursor Systems Studies for the Automated Highway System (AHS) were completed in November 1994. These studies examined a multitude of aspects regarding an AHS. These included logistical and technical issues (e.g., automated check-in and check-out on the system, and roadway deployment), implementation issues (e.g., urban and rural comparisons, and commercial and transit applications), safety issues, and institutional and societal issues. To date, 36 of the 70 reports produced by these studies have
been published, and they are available through NTIS. Some information about the available reports titles, FHWA publication numbers, and NTIS numbers and prices is listed below. These reports will soon be available via CD-ROM distributed by the Volpe National Transportation Systems Center in Cambridge, Mass. Also, within the next two months, the public will be able to access these reports through an Internet home page administered by the Volpe Center.