EVALUATION OF PAVEMENT DISTRESS ON FEDERAL HIGHWAYS IN OGUN STATE, NIGERIA
ABSTRACT
The rapid deterioration of federal highway pavements in Ogun State, Nigeria, poses a critical challenge to the region’s transportation efficiency, economic productivity, and public safety. This study evaluates pavement distress on selected federal highways in Ogun State using the Pavement Condition Index (PCI) methodology in accordance with ASTM D6433, supplemented by visual distress surveys and the International Roughness Index (IRI). The research examines multiple distress types including alligator cracking, rutting, potholes, longitudinal and transverse cracking, raveling, and edge failures along key federal corridors. Systematic field inspections were carried out on sample units across the study corridors, and distress data were classified by type, severity, and extent. Results indicate that a significant proportion of the examined pavement sections fall within the ‘Poor’ to ‘Very Poor’ PCI rating categories (0–40), suggesting widespread structural failure requiring urgent rehabilitation or reconstruction. Contributing factors identified include inadequate pavement design specifications, overloading by heavy vehicles, poor drainage systems, substandard construction materials, deferred maintenance, and the adverse effects of the tropical climate. The study recommends the integration of a robust Pavement Management System (PMS), enforcement of axle load regulations, use of appropriate pavement design standards suited to Nigeria’s traffic and climatic conditions, and increased budgetary allocation to road maintenance. Findings from this research provide an empirical baseline for policymakers, highway engineers, and the Federal Ministry of Works in prioritizing maintenance and rehabilitation interventions on federal highways in Ogun State.
Keywords: Pavement Distress, Pavement Condition Index (PCI), Federal Highways, Ogun State, Nigeria, Flexible Pavement, Road Deterioration, Pavement Management System
CHAPTER ONE
INTRODUCTION
1.1 Background of the Study
Road infrastructure constitutes the backbone of any nation’s socio-economic development framework. It facilitates the movement of people, goods, and services, enabling trade, agricultural productivity, and access to essential services such as health care, education, and emergency response. In Nigeria, roads account for over 90 percent of the country’s freight and passenger transportation, making the health and functionality of the highway network a matter of profound national importance (Adagunodo, Adeniji, & Okeniyi, 2025). Within this context, Ogun State occupies a strategic position in Nigeria’s transportation geography, serving as a critical corridor between Lagos Nigeria’s commercial capital and the broader hinterland to the north, west, and east. The state’s road network, particularly its federal highways, constitutes indispensable arteries for industrial, agricultural, and commercial activity across the southwest geopolitical zone. Despite the acknowledged centrality of road infrastructure to national development, the condition of Nigeria’s federal highways has deteriorated significantly in recent decades. According to the Federal Ministry of Works (2024), Nigeria’s road network stretches over 208,200 kilometers, of which approximately 28,980 kilometers are paved and roughly 179,220 kilometers remain unpaved. A substantial proportion of the paved network, including federal highways traversing states such as Ogun, is in an advanced state of distress, with numerous sections requiring immediate rehabilitation or reconstruction. The Federal Ministry of Works has acknowledged a funding gap of several trillion naira in the current federal road maintenance budget, underscoring the systemic underfunding that has contributed to accelerating pavement deterioration across the country (Federal Ministry of Works, 2024).
Pavement distress refers to any manifestation of deterioration or defect on the surface or structural layers of a road pavement. Such distress can take numerous forms, including but not limited to alligator (fatigue) cracking, longitudinal cracking, transverse cracking, rutting, potholes, raveling, depression, edge cracking, and corrugation (Shahin, 2005). Each distress type carries specific implications for structural integrity and riding quality, and its presence reflects underlying causes such as traffic-induced fatigue, environmental degradation, subgrade failure, material inadequacy, or poor construction quality. Identifying, classifying, and quantifying these distress types is a foundational activity in the science of pavement engineering and management (Milad et al., 2023).
The Pavement Condition Index (PCI), originally developed by the United States Army Corps of Engineers and later standardized through ASTM D6433, is globally recognized as one of the most reliable, objective, and systematic tools for pavement surface condition assessment. The PCI is a dimensionless index ranging from 0 (failed pavement) to 100 (perfect condition), derived from a structured visual survey of distress types, their severity levels, and the extent of their occurrence across defined sample units of pavement (ASTM D6433-20, 2020). The PCI methodology has been widely validated across diverse road environments and is recommended for use in national pavement management systems (Attoh-Okine, 2003; Ashqar et al., 2025). In the context of Nigerian federal highways, the application of structured pavement evaluation tools such as the PCI remains limited, particularly at the state level. While several studies have examined pavement failure in states such as Kano, Oyo, Anambra, and Lagos (Owolabi, Sadiq & Abiola, 2012; Janet et al., 2023; Afolayan & Abidoye, 2017), systematic empirical assessments of pavement distress on Ogun State’s federal highways using internationally standardized methodologies remain scarce. This gap in the evidence base means that maintenance and rehabilitation decisions are often driven by reactive, politically motivated responses rather than engineering-based prioritization a pattern identified by multiple researchers as a primary driver of Nigeria’s persistent road failure problem (Advanced Journal of Science Technology and Engineering, 2024; Egwunatum et al., 2022). Ogun State’s federal highway network has experienced compounding stressors in recent years. The state’s rapid industrialization, with major industrial estates in Agbara, Sagamu, Ota, Ijebu-Ode, and Papalanto, has led to exponential growth in heavy commercial vehicle traffic. The Ilaro-Papalanto highway, a key federal route serving the Portland cement manufacturing belt of the state, has been extensively studied and found to be structurally deficient, carrying axle loads far exceeding the design threshold of 120 mm pavement thickness for over 505 heavy vehicles per day (Alayaki, 2022). Similarly, routes on the Lagos-Ibadan Expressway and the Sagamu-Abeokuta Expressway both traversing Ogun State have suffered severe distress due to combined effects of heavy traffic, inadequate design, and inadequate routine maintenance (Layade et al., 2017; ThisDay Live, 2025).The economic consequences of pavement distress in Ogun State are significant and multifaceted. Poor road conditions increase vehicle operating costs, reduce freight efficiency, prolong travel times, and contribute to higher road traffic accident rates. A nationwide analysis estimated that disruptions attributable to poor road infrastructure account for approximately 1.6 percent of Nigeria’s Gross Domestic Product (GDP) annually a figure that exceeds the entire GDP contribution of the transport sector itself (Truth Nigeria, 2024). For a state like Ogun, which serves as a manufacturing and logistics hub adjacent to Africa’s most populous city, highway pavement distress translates directly into suppressed investment, constrained economic competitiveness, and higher logistical costs for industries dependent on road connectivity (ThisDay Live, 2025). The climatic conditions of Ogun State further exacerbate pavement deterioration. Located in Nigeria’s humid tropical belt, the state receives average annual rainfall of approximately 1,200 to 1,500 mm, predominantly between April and October. The cyclic wetting and drying cycles associated with the tropical climate accelerate asphalt aging, promote moisture ingress into pavement layers, weaken subgrade soil bearing capacity, and exacerbate distress types such as pothole formation and rutting. Research on pavement behavior in southwestern Nigeria has consistently identified poorly functioning drainage systems and moisture infiltration as major contributors to premature failure (Janet et al., 2023; Ganiyu et al., as cited in Adagunodo et al., 2025).The challenges of pavement design in Nigeria are further compounded by the inadequacy of existing national standards. The Federal Republic of Nigeria Highway Manual (1992) and the Nigerian General Specifications for Roads and Bridges (1997) provide design guidance that researchers and practitioners have repeatedly characterized as outdated and inadequate for the current traffic and environmental demands placed on Nigerian roads (Owolabi, Abiola & Sadiq, 2012; Okigbo, 2012). The predominant use of the California Bearing Ratio (CBR) design method, without adequate consideration of dynamic traffic loading, cumulative axle loads, and tropical material behavior, has produced pavement structures that deteriorate rapidly under real-world conditions (Owolabi et al., 2012). This design inadequacy, combined with poor quality control during construction and deferred routine maintenance, creates a self-reinforcing cycle of failure and expensive emergency rehabilitation.Globally, best practices in pavement asset management now integrate PCI-based condition surveys with Pavement Management Systems (PMS) that enable data-driven prioritization of maintenance and rehabilitation interventions. The Federal Highway Administration (FHWA) of the United States has developed a comprehensive framework for pavement performance monitoring, including the use of rolling wheel deflectometers, automated distress survey vehicles, and machine learning-based PCI prediction tools (FHWA, 2023; Ashqar et al., 2025). In Nigeria, the implementation of PMS at the national level remains limited, and pavement evaluation data at the state level for federal highways are rarely systematically collected, analyzed, or published. The absence of this data infrastructure perpetuates reactive maintenance approaches and the misallocation of scarce public resources.Against this backdrop, the evaluation of pavement distress on federal highways in Ogun State is both timely and imperative. This research seeks to contribute empirical data and systematic analysis to address this gap, providing a foundation upon which informed maintenance programming, policy decisions, and future engineering investigations can be built. By applying the internationally standardized PCI methodology alongside field observations of distress patterns, the study aims to generate a credible assessment of the current pavement condition of selected federal highways in the state, identify dominant distress types and their probable causes, and recommend appropriate rehabilitation strategies.
1.2 Statement of the Problem
Federal highways in Ogun State are experiencing accelerated rates of pavement distress, characterized by widespread pothole formation, extensive cracking networks, surface raveling, rutting, and structural failures that render significant sections of the road network hazardous and inefficient. Despite the critical importance of these roads to the state’s industrial and economic functions, systematic, data-driven evaluation of pavement condition using internationally recognized methodologies has not been adequately conducted on these highways.The consequences of this neglect are severe. Without reliable condition data, maintenance decisions are made reactively and often politically rather than on the basis of engineering need and priority. Resources allocated to road maintenance are therefore frequently misdirected, resulting in superficial repairs that delay but do not prevent eventual structural failure. Heavy commercial vehicles continue to operate on pavements designed for lighter traffic loads, accelerating distress propagation. Meanwhile, the growing industrial and urban development in Ogun State continues to intensify traffic demands on a highway network that is structurally and functionally compromised.There is a fundamental deficit in empirical, site-specific pavement distress data for federal highways in Ogun State. This deficit hampers the ability of the Federal Ministry of Works, the Federal Roads Maintenance Agency (FERMA), and state-level transportation authorities to develop evidence-based maintenance strategies, allocate resources efficiently, and plan long-term rehabilitation programs. The absence of this empirical foundation represents both a knowledge gap and a governance failure with tangible economic, safety, and developmental consequences.
1.3 Aim and Objectives of the Study
The aim of this study is to evaluate the pavement distress condition of selected federal highways in Ogun State, Nigeria, using the Pavement Condition Index (PCI) methodology and field-based distress surveys, in order to provide an evidence-based assessment of road condition and recommend appropriate maintenance and rehabilitation strategies.
In order to achieve this aim, the following specific objectives are pursued:
1. To identify and classify the types of pavement distress present on selected federal highways in Ogun State using visual inspection procedures consistent with ASTM D6433 standards.
2. To determine the severity levels and extent of identified distress types across defined sample units of the study highway sections.
3. To calculate the Pavement Condition Index (PCI) for each sample unit and the overall study highway sections, and to categorize pavement condition ratings accordingly.
4. To identify the probable causes and contributing factors underlying the observed pavement distress patterns on the selected highways.
5. To recommend appropriate maintenance, rehabilitation, and pavement management strategies based on the evaluated pavement condition data.
1.4 Scope of the Study
This study is focused on selected federal highway sections within Ogun State, Nigeria. The scope encompasses the visual inspection and distress quantification of flexible (asphalt) pavement surfaces on the selected routes. The study adopts the Pavement Condition Index (PCI) method as the primary evaluation framework, in accordance with ASTM D6433-20 standard procedures. The research does not extend to rigid (concrete) pavements, and does not include subsurface geotechnical investigation, laboratory material testing, or structural deflection measurements. The highways selected for this study represent major federal corridors within Ogun State that serve significant traffic volumes and have exhibited visible signs of distress. Environmental and traffic loading conditions specific to the study area are considered in the analysis of distress causes and the formulation of recommendations.
1.5 Significance of the Study
This research makes several important contributions at the theoretical, practical, and policy levels. At the theoretical level, it contributes to the growing body of empirical literature on pavement condition evaluation in developing country contexts, specifically addressing the under-documented case of Ogun State’s federal highway network. By applying internationally standardized PCI methodology within a Nigerian state-level context, the study provides a methodological model that can be replicated across other states in the country. At the practical level, the study generates condition data that can directly inform maintenance planning, budget prioritization, and rehabilitation scheduling by the Federal Ministry of Works and FERMA. The identification of dominant distress types and their probable causes enables targeted engineering interventions rather than blanket, cost-inefficient rehabilitation programs. This is particularly critical given the documented funding constraints facing Nigeria’s federal road maintenance budget (Federal Ministry of Works, 2024). At the policy level, the study provides evidence that supports the case for mandatory periodic pavement condition surveys on federal highways, investment in Pavement Management Systems at the national and state levels, and the enforcement of axle load regulations to protect pavement integrity. Given that poor road infrastructure has been estimated to cost Nigeria approximately 1.6 percent of GDP annually (Truth Nigeria, 2024), evidence-based highway maintenance policy has significant macroeconomic implications. The findings of this study therefore hold relevance not only for highway engineers and transportation planners but also for policymakers, economists, and development practitioners.
1.6 Limitations of the Study
The study acknowledges certain limitations that should be considered in interpreting the findings. First, the evaluation is restricted to visual surface distress assessment; structural adequacy of the pavement layers which requires deflection testing using equipment such as the Falling Weight Deflectometer (FWD) is beyond the scope of this research. Second, the study covers selected sections of federal highways rather than the entire federal highway network in Ogun State, which means findings may not be fully representative of all federal routes in the state. Third, traffic counting data and axle load distribution data used in the analysis are obtained from available secondary sources, and the accuracy of these estimates is subject to the limitations of the data sources. Finally, the study was conducted over a defined period; seasonal variations in pavement condition, particularly in relation to rainfall and temperature cycles, may affect the generalizability of condition ratings to other times of the year.
1.7 Organization of the Study
This research report is organized into five chapters. Chapter One provides the introduction, including the background of the study, statement of the problem, aims and objectives, scope, significance, and limitations. Chapter Two presents a comprehensive review of relevant literature on pavement distress types, evaluation methodologies, pavement management systems, and previous studies on road pavement failure in Nigeria and specifically in Ogun State. Chapter Three describes the research methodology, including the study area, field survey procedures, PCI calculation method, and data analysis approach. Chapter Four presents the results of the pavement distress surveys, PCI calculations, condition ratings, and analysis of dominant distress types and their probable causes. Chapter Five provides a summary of findings, conclusions drawn from the study, and detailed recommendations for maintenance, rehabilitation, and pavement management policy.
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