AASHTO PP 108-2023
Assessment of Navigation Drift Mitigation in Transverse Pavement Profiling Systems

Standard No.

AASHTO PP 108-2023

Release Date

2023

Published By

American Association of State Highway and Transportation Officials

Status

Be replaced

Replace By

AASHTO PP 108-2024

Latest

AASHTO PP 108-2025

Introduction

Standard Background and Technological Evolution

The American Association of State Highway and Transportation Officials (AASHTO) revised the PP 108-23 standard in 2023 to specifically address the navigation drift of transverse pavement profilers (TPPs). As pavement inspection technology evolves from traditional manual measurement to automated, high-precision systems, the use of inertial navigation systems (INS) in pavement profile measurement is becoming increasingly widespread. However, the resulting navigation drift has severely impacted the accuracy and reliability of measurement data.

The technological evolution of this standard reflects the stringent requirements for position accuracy in the pavement inspection field. From early visual odometry to modern multi-sensor fusion navigation systems, the stability of position estimation has always been a key technical challenge. Through standardized testing procedures and rigorous data analysis methods, the PP 108-23 standard provides equipment manufacturers and testing organizations with a unified performance evaluation benchmark.

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Scope of Application and Technical Requirements

This standard primarily applies to transverse pavement profile systems (TPPs) that provide global pavement position information, focusing on evaluating the drift characteristics of these positioning systems over extended periods of operation. The standard explicitly requires that this test be used in conjunction with three other standard practices to form a complete TPP performance evaluation system.

Associated Standards	Assessment Content	Technical Focus
PP 106	Static Performance Evaluation	Measurement Accuracy of the System in a Stationary State
PP 107	Body Motion Compensation Evaluation	The Impact of Vehicle Motion on Measurement Results
PP 109	Ground Reference and Lateral Width Evaluation	Verification of Reference Object Position Accuracy

The core technical requirements of the standard focus on ensuring the accuracy and repeatability of lateral measurement data, which is of great significance to network-level and project-level data collection. Measurement accuracy directly affects the calculation results of pavement deformation parameters such as rutting depth, cross slope, and curb drop.

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Test Site and Equipment Requirements

The standard specifies specific test site specifications, requiring a minimum length of 54 meters and a minimum width of 24 meters. A figure-eight test route must be established. This unique route design effectively simulates the lateral acceleration variations experienced during actual driving.

Physical parameters	Symbol	Default value	Permissible deviation
Minimum length of test area	LT	54 m	Fixed value
Minimum width of test area	WT	24 m	Fixed value
Figure eight turn radius	R	10.0 m	±0.2 m
Distance between turning centers	D	28.3 m	±0.5 Target forward speed: 13 kph. Adjusted based on lap time. The reference object specifications are equally stringent, with a maximum horizontal width/length of 540 ± 70 mm and a vertical height of 75 ± 25 mm. The reference object's flatness tolerance is ± 5 mm, and its parallelism tolerance is ± 5 mm. The surface treatment must produce diffuse reflection, with specular reflection not exceeding 5%. Data Collection and Processing Procedure: During data collection, the TPP system must travel along a figure-eight path at a target speed of 13 km/h, completing at least five complete loops. This is equivalent to measuring the reference object ten times. Each lap must be completed in less than 37 seconds to ensure sufficient lateral acceleration during the test. Data processing utilizes the Iterative Closest Point (ICP) algorithm to determine optimal registration parameters by minimizing the distance error between the reference and measured point clouds. This process involves complex coordinate transformation calculations and requires specialized mathematical modeling and programming capabilities. In a provincial highway inspection project, a PP 108-23-compliant transverse pavement profile system was used to assess road conditions. During testing, the system drove along a prescribed figure-eight route, repeatedly measuring reference objects to obtain statistical distribution data for positional error. Data analysis showed that the system's positional error in both the east and north directions was within ±1000 mm, and its elevation repeatability error was within ±150 mm, fully meeting standard certification requirements. Error Analysis and Certification Requirements The standard evaluates the impact of navigation drift through rigorous statistical analysis methods, focusing on error metrics in three directions: easting position error (eX), northing position error (eY), and elevation position repeatability (rZ). These error data form the basis for device certification. Output parameters Test statistics 90% lower confidence limit 50% lower confidence limit 50% upper confidence limit 90% upper confidence limit Easting position error eX -1000 mm -500 mm 500 mm 1000 mm Northing position error eY -1000 mm -500 mm 500 mm 1000 Certification requirements are determined by the owner organization based on the specific application scenario and frequency of use. Equipment must successfully complete the test procedures specified in Section 6 and meet the requirement statements in Table 2. This tiered certification system ensures the suitability of equipment for different application scenarios. When implementing the PP 108-23 standard, a systematic approach is recommended to ensure test validity and reliable results. First, the selection of the test site is crucial; obstructions should be avoided to ensure safe testing. Second, the installation and leveling of reference objects must be carried out in strict accordance with the standard. Surveying-grade equipment should be used to determine the global position of the reference points with an accuracy of ±50 mm. During the data collection process, it is recommended to monitor vehicle speed and lap time in real time and make timely adjustments to ensure compliance with test conditions. During the data processing phase, the implementation accuracy of the ICP algorithm should be verified to ensure the mathematical correctness of the alignment process. Finally, regular system calibration and performance verification should be performed, and a comprehensive equipment maintenance and quality management system should be established in combination with manufacturer recommendations and standard requirements. For equipment manufacturers, it is recommended to consider the certification requirements of the PP 108-23 standard during the product design phase, optimize navigation algorithms and sensor configurations, and improve the system's anti-drift capability. For testing organizations, it is recommended to establish standardized test processes and data analysis templates to improve test efficiency and consistency of results. AASHTO PP 108-2023 Referenced Document AASHTO PP 106 Standard Practice for Assessment of Static Performance in Transverse Pavement Profiling Systems*， 2025-01-01 Update AASHTO PP 107 Standard Practice for Assessment of Body Motion Cancellation in Transverse Pavement Profiling Systems*， 2025-01-01 Update AASHTO PP 109 Standard Practice for Assessment of Highway Performance of Transverse Pavement Profiling Systems*， 2025-01-01 Update AASHTO PP 111 Definition of Terms Related to Transverse Pavement Profiling Systems and Ground Reference Equipment*， 2024-01-01 Update AASHTO PP 108-2023 history 2025 AASHTO PP 108-2025 Standard Practice for Assessment of Navigation Drift Mitigation in Transverse Pavement Profiling Systems 2024 AASHTO PP 108-2024 Standard Practice for Assessment of Navigation Drift Mitigation in Transverse Pavement Profiling Systems 2023 AASHTO PP 108-2023 Assessment of Navigation Drift Mitigation in Transverse Pavement Profiling Systems 2021 AASHTO PP 108-2021 Standard Practice for Assessment of Navigation Drift Mitigation in Transverse Pavement Profiling Systems Standard and Specification AASHTO PP 108-2024 Pavement Profiling Systems AASHTO PP 108-2021 Pavement Profiling Systems AASHTO PP 108-2025 Pavement Profiling Systems AASHTO PP 106-2024 Standard Practice for Assessment of Static Performance in Transverse Pavement Profiling Systems AASHTO PP 107-2024 Standard Practice for Assessment of Body Motion Cancellation in Transverse Pavement Profiling Systems AASHTO PP 107-2023 Standard Practice for Assessment of Body Motion Cancellation in Transverse Pavement Profiling Systems AASHTO PP 106-2023 Assessment of Static Performance in Transverse Pavement Profiling Systems AASHTO PP 106-2021 Standard Practice for Assessment of Static Performance in Transverse Pavement Profiling Systems AASHTO PP 111-2023 Definition of Terms Related to Transverse Pavement Profiling Systems and Ground Reference Equipment Copyright ©2025 All Rights Reserved