FHWA FHWA-PROJ-09-0045 Development of New Default Traffic Datasets for the Mechanistic-Empirical Pavement Design Guide Using the Data from Long-Term Pavement Performance Specific Pavement Study Traffic Data Collection Pooled Fund Study, TPF-5(004) 9/30/09 to 5/30/12
FHWA FHWA-PROJ-11-0110 Evaluation of Long-Term Pavement Performance Program Climatic Data for Use in Mechanistic-Empirical Pavement Design Guide Calibration and Other Pavement Analyses 5/18/11 to 1/17/15
Problem Statement Number LTPP-PROJ-0000054 Assess the Adequacy of the Available Long-Term Pavement Performance Data to Support Conclusions Concerning the Implications of Construction Variability for Pavement Susceptibility to Environmentally Induced Variations 1/1/00 to 1/1/00
Problem Statement Number LTPP-PROJ-0000060 Conduct an Objective Assessment of the Applicability and Utility of Existing Models for Prediction of Long-Term Changes in Pavement Materials 1/1/00 to 1/1/00
FHWA FHWA-PROJ-14-0131 Incorporating a Curling Factor in Layer Moduli Backcalculation Using Long-Term Pavement Performance's (LTPP’s) Seasonal Monitoring Program (SMP) Falling Weight Deflectometer (FWD) Data for Jointed Pavement Test Sections 5/1/14 to 11/30/15
Problem Statement Number LTPP-PROJ-0000067 Application of the Long-Term Pavement Performance Data to Validate Theoretical Analysis of the Relative Impacts of the Environment and Traffic on Pavement Response and Subsequent Performance 1/1/00 to 1/1/00
Problem Statement Number LTPP-PROJ-0000077 Develop Hierarchical Data Collection for Accurate Network- and Project-Level Pavement Management Considering Types and Frequency of Measurements 1/1/00 to 1/1/00
Problem Statement Number LTPP-PROJ-0000122 Constitutive Model of Complex Modulus of Asphalt From Ground Penetrating Radar Composition and Calibrated to Falling Weight Deflectometer Measurements 1/1/00 to 1/1/00
Problem Statement Number LTPP-PROJ-0000124 Constitutive Model of Unbound, Modified, and Stabilized Base Course From Ground Penetrating Radar Composition and Calibrated to Falling Weight Deflectometer Measurements 1/1/00 to 1/1/00
Problem Statement Number LTPP-PROJ-0000135 Determination of Long-Term Pavement Performance Experiment Maturity for Analysis in Maintenance and Rehabilitation and Other Strategic Objective Analytical Projects 1/1/00 to 1/1/00
Problem Statement Number LTPP-PROJ-0000139 Performance Efficacy and Characterization of the Series of Pavement Maintenance and Preservation and Rehabilitation Activities Needed Over the Life of a Pavement System 1/1/00 to 1/1/00
Problem Statement Number LTPP-PROJ-0000140 Followup of NCHRP to 14-14 Research with Emphasis on Quantitative Analysis of Enlarged Long-Term Pavement Performance Maintenance and Rehabilitation Database (M&R) and Supplemental M&R Data From State Highway Administrations and Others 1/1/00 to 1/1/00
NCHRP 1-34D Effects of Subsurface Drainage on Performance of Asphalt and Concrete Pavements, Evaluation, and Analysis of Long-Term Pavement Performance SPS-1 and SPS-2 Field Sections 11/18/02 to 12/31/06
Problem Statement Number LTPP-PROJ-0000175 Creation of Mechanistic-Empirical Pavement Design Guide Subdatabase of Most Complete Datasets That Can Be Used for Analysis (After the Release of DARWin-ME and To Be Combined with 8B1) 1/1/00 to 1/1/00
Problem Statement Number LTPP-PROJ-0000176 State Data vs. Long-Term Pavement Performance Data Since Long-Term Pavement Performance Units and Protocols Were Used in Mechanistic-Empirical Pavement Design Guide 1/1/00 to 1/1/00
Problem Statement Number LTPP-PROJ-0000190 Guidance on the Use of Long-Term Pavement Performance Data for the Mechanistic-Empirical Pavement Design Guide by Non-State Agency Users (i.e. consultants, contractors, associations, local governments, academics, international) 1/1/00 to 1/1/00
Problem Statement Number LTPP-PROJ-0000197 Material Characteristics for Pavement Design (Moved from 2E1 v2) 1/1/00 to 1/1/00
Sequence numbers denote the order in which Analysis Outcomes should be
addressed for a given Objective. Analysis Outcomes with the same
sequence number can be addressed at the same time.
Dashed light blue boxes are ongoing NCHRP
projects that were initiated by the LTPP ETG.
Solid Light Blue boxes are completed projects.
Dashed pink boxes are ongoing NCHRP projects
that were initiated by other agencies or work groups,
but are directly associated with LTPP Data Analysis
Plan Strategic Objectives and Analysis Outcomes.Solid Pink boxes are completed projects.
Dashed white boxes are proposed Research Problem
Statements that were developed at LTPP Workshops.
See Note 1) for an explanation of the Problem Statement
Hashed orange boxes are planned FHWA
projects or data studies that will be funded
using LTPP budgeted funds.
Dashed orange boxes are ongoing FHWA
projects that were funded using LTPP
Thin solid boxes are completed projects with
Thick solid boxes are completed projects with
1) Problem Statements are assigned a 3 character
number using the convention 'O_A_n'. 'O' is the
associated Strategic Objective number (1 through 9);
'A' is the associated Analysis Outcome letter
(A, B, C etc.) and 'n' is an arbitrarily assigned number
used for identification purposes. The number 'n' does
not imply a sequence in which Problem Statements
should be addressed.