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Research Search Results

Research

Development of Guidelines for Rehabilitation of Existing highway and Rail Transit Tunnels

  • 2010
  • AASHTO
  • CEO / GM / Commissioner
  • Director / Program Manager
  • Freeway Management
  • Freeway Operations
  • Manager / First Line Supervisor
  • NCHRP
  • Research
  • Research
  • Research
  • TRB
  • Transit Operations
    • |PDF
Existing highway and rail transit tunnels are gradually becoming functionally obsolete and structurally deficient. These structures cause safety concerns. Older tunnels need frequent inspections, higher levels of maintenance, and rehabilitation. There is limited experience in the State Departments o
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Research

Traffic Enforcement Strategies for Work Zones

  • 2010
  • Associate Engineer
  • Business Processes/Policies and Procedures
  • Engineer
  • Interagency Agreements / Cooperation / MOUs
  • NCHRP
  • Public Safety Officer
  • Public safety agency collaboration
  • Research
  • Research
  • Research
  • Researcher/Academic
  • Senior Engineer
  • Technician
  • Work Zone Management
  • Work Zone Management
  • Work Zone Traffic Management
  • Work Zone Traffic Management

This report presents guidance for the safe and effective deployment of traffic enforcement strategies in work zones on high-speed highways with speed limits greater than 45 mph. The report discusses planning, design, and operation of traffic enforcement strategies, and associated a

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Research

Application of AASHTO LRFD Specifications to Design of Sound Barriers

  • 2010
  • AASHTO
  • Associate Engineer
  • CEO / GM / Commissioner
  • Director / Program Manager
  • Engineer
  • Maintenance Staff
  • Maintenance and Operations
  • Manager / First Line Supervisor
  • Media / PIO
  • NCHRP
  • Operator
  • Principal Engineer
  • Project Development
  • Project Development Overview
  • Public
  • Public Safety Officer
  • Research
  • Research
  • Research
  • Researcher/Academic
  • Roadside Maintenance
  • Senior Engineer
  • Senior Manager
  • TRB
  • Technical Understanding
  • Technician
  • Transit Professional
  • Transportation Planner
    • |PDF
The current design criteria for sound barriers are based on the AASHTO Standard “Guide Specifications for Design of Sound Barriers” dated 1989 and interims through 2002. The content of the AASHTO Guide Specifications for design of sound barriers is not consistent with the requirements of the AASHTO
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Research

Putting Customer Research into Practice: Guidelines for Conducting, Reporting, and Using Customer Surveys Related to Highway Maintenance Operations

  • 2005-2009
  • CEO / GM / Commissioner
  • Customer Request Management
  • Director / Program Manager
  • Manager / First Line Supervisor
  • NCHRP
  • Public
  • Research
  • Research
  • Research
  • Researcher/Academic
    • |PDF
The research objective was to synthesize and provide illustrative examples for existing highway maintenance-related market research or customer survey activities or efforts conducted by SHA. The compilation includes: 1. Documentation of current customer survey practices at state DOTs related
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Best Practice

Best Practices for Implementing Quality Control and Quality Assurance for Tunnel Inspection

  • 2005-2009
  • AASHTO
  • Associate Engineer
  • Best Practice
  • Best Practice
  • Engineer
  • Maintenance Staff
  • Manager / First Line Supervisor
  • NCHRP
  • Operator
  • Principal Engineer
  • Research
  • Researcher/Academic
  • Risk Management
  • Risk Management
  • Senior Engineer
  • Senior Manager
  • TRB
  • Technical Understanding
  • Technician
  • Training and Profesional Development
    • |PDF
The objective of this project is to develop guidelines for owners to use in selecting practices for tunnel inspection, operational safety and emergency response systems testing, and inventory procedures to improve the safety of highway tunnels.
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Research

Replacement Process for LED (Light Emitting Diode) Traffic Signals

  • 2005-2009
  • AASHTO
  • Adaptive Signal Control Technology
  • Advanced Traffic Signal Control
  • Advanced Traffic Signal Control
  • Associate Engineer
  • Engineer
  • Maintenance Staff
  • Manager / First Line Supervisor
  • NCHRP
  • Operator
  • Planning Analysis Tools
  • Principal Engineer
  • Regional Traffic Signal Operations & Program Management
  • Research
  • Research
  • Research
  • Researcher/Academic
  • Senior Engineer
  • Senior Manager
  • Statewide and Regional Integration
  • TRB
  • Technical Understanding
  • Technician
  • Traffic Signal Timing
  • Traffic Signal Timing Software
  • Transit Signal Priority
  • Transit Signal Priority
    • |PDF
As an initial step in developing maintenance guidelines for LED traffic signals, this project developed a process for determining when LED traffic signal heads should be replaced. Task 1. Synthesize existing human factors research relevant to the visibility of traffic signals, updating it as ap
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Research

Performance Measurement Framework for Highway Capacity Decision Making

  • 2005-2009
  • Research
    • |PDF

This report describes a performance measurement framework that supports the collaborative decision-making framework for additions to highway capacity. Five broad areas of performance are identified: transportation, environment, economics, community, and cost. The report devotes a chapter to each

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Research

Safety Impacts of the Emerging Digital Display Technology for Outdoor Advertising Signs

  • 2005-2009
  • AASHTO
  • Adaptive Signal Control Technology
  • Advanced Traffic Signal Control
  • Advanced Traffic Signal Control
  • Associate Engineer
  • Engineer
  • Maintenance Staff
  • Maintenance and Operations
  • Manager / First Line Supervisor
  • NCHRP
  • Operator
  • Planning Analysis Tools
  • Principal Engineer
  • Public Safety Officer
  • Regional Traffic Signal Operations & Program Management
  • Research
  • Research
  • Research
  • Researcher/Academic
  • Senior Engineer
  • Senior Manager
  • Sign Maintenance and Replacement
  • Statewide and Regional Integration
  • TRB
  • Technical Understanding
  • Technician
  • Traffic Signal Timing
  • Traffic Signal Timing Software
  • Transit Signal Priority
  • Transit Signal Priority
    • |PDF
This topic will review on-going human factor studies and guidelines with regard to highway agency DMS’s and CMS’s now in use on highways. The panel noted that the panel for this topic should include a representative from the outdoor advertising industry. The final report has been submitted and copi
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State-of-the Practice

Default Values for Capacity and Quality of Service Analyses

  • 2005-2009
  • Advanced Traffic Signal Control
  • Arterial Traffic Control Device Operations
  • Associate Engineer
  • Engineer
  • Freeway Management
  • Freeway Operations
  • NCHRP
  • Principal Engineer
  • Research
  • Senior Engineer
  • State-of-the Practice
  • Technology Tracker
  • Traffic Signal Timing

This report presents valuable information on the appropriate selection of default values when analyzing highway capacity and level of service based on an extensive set of field data from across the United States. In addition, the report describes how to prepare service volume tables, which c

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Research

ADA Compliance at Transportation Agencies: A Review of Practices

  • 2005-2009
  • Associate Engineer
  • Business Processes/Policies and Procedures
  • CEO / GM / Commissioner
  • Director / Program Manager
  • Engineer
  • Maintenance Staff
  • Manager / First Line Supervisor
  • Media / PIO
  • NCHRP
  • Operator
  • Principal Engineer
  • Public
  • Public Safety Officer
  • Research
  • Research
  • Research
  • Researcher/Academic
  • Senior Engineer
  • Senior Manager
  • Technician
  • Transit Professional
  • Transportation Planner
    • |PDF
To assess ADA compliance agencies need to develop a comprehensive inventory of pedestrian pathways and crossings, identify non-compliant locations and develop a program for remedial repairs to bring facilities into compliance. Such an inventory is necessary to adequately address ADA issues during de
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