This paper describes the road infrastructure found in California's national forests, their vulnerabilities, and specific measures that can be taken to adapt to projected climate change effects, thus minimizing damage from fires and storms. Over the past 40 years this region has been hit by numerous climate change-related events including droughts, major forest fires, major storms, and flooding. Billions of dollars in damage have been sustained and numerous lives lost. It is necessary now to assess vulnerabilities, rank resources at risk, and prioritize adaptation actions. The Forest Service has recently been involved in infrastructure vulnerability assessment and adaptation strategy projects involving climate model studies, interviews, a literature review, local workshops, website information, and publication of the project findings. Different agency vulnerability assessment methods have been reviewed to establish a functional assessment and risk analysis methodology. Efforts to mitigate the impacts of climate change have included greenhouse gas reduction from agency vehicles, evaluating alternative transportation routes, implementing energy-saving measures, and identifying stormproofing road design measures to reduce the vulnerability of roads to extreme climate-related events. Much of the effort has been the identification of road adaptation and resiliency measures, particularly measures that are practical and implementable at minimum cost. These measures include: routine road maintenance; relocating road segments as needed; adding trash racks and diversion prevention dips to prevent culvert failures; building stream simulation projects; protecting bridges from debris and scour; covering soil with deep-rooted vegetation; and using soil bioengineering stabilization and deep-patch shoulder reinforcement to prevent local slope failures.

Road infrastructure plays an important role in strengthening transportation and driving the economic advancement of countries. However, the increasing traffic volume has accelerated road deterioration, particularly at critical points like bridge-road junctions. Traditional repair methods involving demolition and reconstruction lead to extended closures and high costs. This study explores the polyurethane (PU) foam injection technique as an alternative solution, which can reduce both repair time and costs. The research evaluates the application of PU foam in various road projects across Thailand, highlighting its ability to repair pavement surfaces and structures, even in severely damaged areas. Despite its advantages, the use of PU foam faces challenges due to a lack of standardized quality control. This paper proposes a set of working guidelines for PU foam injection, aimed at key stakeholders such as the Department of Highways, the Department of Rural Roads, and the Department of Local Administration. The findings underline the importance of establishing standardized methods to ensure the long-term effectiveness of PU foam in road maintenance. Future research should focus on refining these guidelines for diverse road conditions to support the sustainable development of national transportation infrastructure.

Local site characterization and regional tectonic environment are crucial when designing earthquake-resistant bridges. Insufficient understanding of these factors can lead to significant seismic damages and low resilience of bridge components. In this study, the seismic loss and resilience of bridges located in soft soil are examined based on proposed fragility functions at both the individual element and system levels. The effects of aging and construction quality are also taken into account to evaluate the seismic performance of bridges. The findings of this study revealed that bridges in soil class D are the most vulnerable in all seismic and structural integrity scenarios. Bridges with inadequate seismic design may not have the necessary flexibility to absorb and dissipate seismic energy. The findings of this study can also contribute to evaluating transportation network functionality and decision-making procedures within a designated framework for disaggregation in any earthquake scenario

While plastic has been recognized as one of the top ten notable advancements of the 20th century, extensive utilization of plastic in its various forms has evolved into a complex concern with respect to environmental protection. The large amount of waste plastic and its low biodegradability is driving the research effort seeking alternatives to recycling plastic waste into construction materials, and recycled plastic utilization as a valuable alternative to soil, asphalt, and concrete appears to be one of the more promising solutions for beneficial use of plastic waste. Recent progress on recycled plastic utilization in transportation infrastructure systems, including content, size, shape, mechanism, effectiveness, and its applicability to soil, asphalt, and concrete, is outlined in this review paper. The effects of recycled plastic addition on the mechanical properties of soil, asphalt, and concrete are also discussed in detail. The potential for environmental disturbance and possible implementation difficulties in understanding the progress of recycled plastics utilization has also been investigated.