Browsing Technical Reports (VTTI) by Title
Now showing items 1-20 of 55
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Access Control Design on Highway Interchanges
(Virginia Center for Transportation Innovation and Research, 2008-01-01)The adequate spacing and design of access to crossroads in the vicinity of freeway ramps are critical to the safety and traffic operations of both the freeway and the crossroad. The research presented in this report develops ... -
Analysis of Repeated Network-Level Testing by the Falling Weight Deflectometer on I-81 in the Virginia Department of Transportation's Bristol District
(Virginia Transportation Research Council, 2016-11)This study was undertaken in an effort to determine the required time between subsequent rounds of network-level pavement deflection testing using a falling weight deflectometer (FWD) on the Virginia Department of ... -
Asphalt Materials Characterization in Support of Implementation of the Proposed Mechanistic-Empirical Pavement Design Guide
(Virginia Center for Transportation Innovation and Research, 2007-01-01)The proposed Mechanistic-Empirical Pavement Design Guide (MEPDG) procedure is an improved methodology for pavement design and evaluation of paving materials. Since this new procedure depends heavily on the characterization ... -
Assessment of the Durability of Wet Night Visible Pavement Markings: Wet Visibility Project Phase IV
(Virginia Center for Transportation Innovation and Research, 2012-06)This project encompassed a research effort to establish the durability of pavement markings in an on-road installation. Six marking technologies were installed on a portion of Route 460 in Blacksburg, Virginia. A human ... -
Assessment of the Performance of Light-Emitting Diode Roadway Lighting Technology
(Virginia Transportation Research Council, 2015-10)This study, championed by the Virginia Department of Transportation (VDOT) Traffic Engineering Division, involved a thorough investigation of light-emitting diode (LED) roadway lighting technology by testing six types of ... -
Automated Vehicle Crash Rate Comparison Using Naturalistic Data
(Virginia Tech Transportation Institute, 2016-01-08)This study assessed driving risk for the United States nationally and for the Google Self-Driving Car project. Driving safety on public roads was examined in three ways. The total crash rates for the Self-Driving Car and ... -
Best Practices and Performance Assessment for Preventative Maintenance Treatments for Virginia Pavements
(Virginia Transportation Research Council, 2015-08)Preventive maintenance has the potential to improve network condition by retarding future pavement deterioration. This report outlines guidelines for implementing a preventive maintenance policy for bituminous pavements. ... -
Carbon Fiber Reinforced Polymer Grids for Shear and End Zone Reinforcement in Bridge Beams
(Virginia Transportation Research Council, 2018-01)Corrosion of reinforcing steel reduces life spans of bridges throughout the United States; therefore, using non-corroding carbon fiber reinforced polymer (CFRP) reinforcement is seen as a way to increase service life. The ... -
Composite Pavement Systems: Synthesis of Design and Construction Practices
(Virginia Center for Transportation Innovation and Research, 2008-11-01)Composite pavement systems have shown the potential for becoming a cost-effective pavement alternative for highways with high and heavy traffic volumes, especially in Europe. This study investigated the design and performance ... -
Continuous Friction Measurement Equipment As a Tool for Improving Crash Rate Prediction: A Pilot Study
(Virginia Transportation Research Council, 2016-01)A comprehensive pavement management system includes a Pavement Friction Management Program (PFMP) to ensure pavement surfaces are designed, constructed, and maintained to minimize friction-related crashes in a costeffective ... -
Description of the SHRP 2 Naturalistic Database and the Crash, Near-Crash, and Baseline Data Sets
(Virginia Tech Transportation Institute, 2016-04)The focus of this project was to identify and prepare crash, near-crash, and baseline data sets extracted from the Second Strategic Highway Research Program (SHRP 2) Naturalistic Driving Study (NDS) trip files, then to ... -
Determination of the In-Place Hot-Mix Asphalt Layer Modulus for Rehabilitation Projects Using a Mechanistic-Empirical Procedure
(Virginia Center for Transportation Innovation and Research, 2006-07-01)This project evaluated the procedures proposed by the Mechanistic-Empirical Pavement Design Guide (MEPDG) to characterize existing hot-mix asphalt (HMA) layers for rehabilitation purposes. Thirty-three cores were extracted ... -
Developing a Network-Level Structural Capacity Index for Structural Evaluation of Pavements
(Virginia Center for Transportation Innovation and Research, 2013-03-01)The objective of this project was to develop a structural index for use in network-level pavement evaluation to facilitate the inclusion of the pavement's structural condition in pavement management applications. The primary ... -
Development of a Framework for Evaluating Yellow Timing at Signalized Intersections
(Virginia Center for Transportation Innovation and Research, 2011-02-01)Studies show that the proper design of clearance intervals has significant implications for intersection safety. For example, in 2001, approximately 218,000 red-light-running crashes occurred at signalized intersections ... -
Evaluation of a Buried Cable Roadside Animal Detection System
(Virginia Transportation Research Council, 2015-06)Animal-vehicle collisions (AVC) are a concern for departments of transportation as they translate into hundreds of human fatalities and billions of dollars in property damage each year. A recently published report states ... -
Evaluation of Innovative Approaches to Curve Delineation for Two-Lane Rural Roads
(Virginia Transportation Research Council, 2018-06)Run-off-road crashes are a major problem for rural roads. These roads tend to be unlit, and drivers may have difficulty seeing or correctly predicting the curvature of horizontal curves. This leads to vehicles entering ... -
Evaluation of the Cargill Safelane Surface Overlay
(Virginia Center for Transportation Innovation and Research, 2009-02-01)A recent development in polymer concrete overlays is the Cargill SafeLane surface overlay (SafeLane overlay). The 3/8-in-thick overlay is constructed with epoxy and broadcast aggregates, as are typical multiple-layer epoxy ... -
Evaluation of the MMLS3 for Accelerated Wearing of Asphalt Pavement Mixtures Containing Carbonate Aggregates
(Virginia Transportation Research Council, 2014-06)The purpose of this study was to develop an accelerated wearing protocol for assessing the susceptibility of asphalt surface mixtures to polishing. This was the second phase of the study. The first phase focused on assessing ... -
Evaluation of Traffic Responsive Control on the Reston Parkway Arterial Network
(Virginia Center for Transportation Innovation and Research, 2009-02-01)Traffic responsive plan selection (TRPS) control is considered an effective operational mode in traffic signal systems. Its efficiency stems from the fact that it can capture variations in traffic patterns and switch timing ... -
Examination of the Current Practice of Lighting in Virginia: Nighttime Work Zones and Improving Safety Through the Development of Nighttime Lighting Specifications
(Virginia Transportation Research Council, 2017-09)This project evaluated current nighttime work zone lighting practices for limited-access highways and primary routes in Virginia through (1) an on-site evaluation of lighting levels in work zones; (2) an illuminance ...
