Accessibility is commonly assessed using indicators calculated from spatial data. Comparatively perceived accessibility cannot be adequately reflected by these calculated measures because it involves the perception to participate in spatially dispersed opportunities. This highlights the need to understand and consider perceived accessibility for planning and evaluation of transport systems from a complementary perspective. Therefore, this study aims to offer a systematic review concerning the interpretations of perceived accessibility in transport, its concept, major social drivers, barriers, evaluation methods and key influencing factors. This review also highlights the importance of perceived safety and service quality in public transport and their relationship with perceived accessibility in daily travel. The paper argues that perceived accessibility with due consideration of perceived safety and service quality will contribute to the development from mobility-based to accessibility-based planning.

The construction sector in Malaysia has been facing challenges in productivity due to the increase in greenhouse gas (GHG) emissions. This study aims to enhance the usage of low-carbon building materials among construction professionals so that the carbon emission and GHG can be reduced during the early stage of construction. The scope of this research involved main parties in the Malaysian construction industry, represented by fifty professionals including contractors, consultants, and architects with a focus on low-carbon building materials. Procedures in this study involved a literature review on low-carbon building materials in the construction industry followed by a questionnaire survey with analysis using One-way Analysis of Variance (ANOVA). Major study findings indicated that there is a significant need for increasing the awareness of low-carbon building materials, as this is vital to introduce the concept of sustainable development and consequently cutting down carbon emissions to all parties working in construction. The study also suggested that barriers in adoption also prevent alternative material choices as a means of mitigating embodied carbon emissions. Many of these barriers are common across materials with uptake restricted by lack of demonstration projects, regulation, high costs, shortage of skilled labor, lack of design knowledge, time constraints, and lack of knowledge on LCA. The results are significant as the construction industry can seek to overcome these barriers by providing more information on material performance, design training on alternative materials, cost reduction on low-carbon materials, and more demonstration projects as well as case studies. From the work in this study, the industry must also share the knowledge on embodied carbon and implement regulations that will limit embodied carbon. The industry must adopt a business case strategy in encouraging greater value in assessment schemes to adopt low carbon building materials.

Purpose: The construction industry is a major economic driver in Malaysia, playing a pivotal role in the developing nations economic growth. Malaysia's reliance on labor-driven construction practices often sees local industry lagging in adopting technological advancements common to the construction sector on a global scale. This study investigates the challenges faced by project players in using new construction industrial revolution (IR) 4.0 technologies and the difficulties in implementing these technologies in construction projects.Design/methodology/approach: A quantitative survey was distributed to 183 practitioners in the Malaysian construction industry. The collected data (N = 121) has been analyzed using statistical software to calculate relative importance index values for the identified factors. A triangulation approach to validate the factors obtained from the survey was conducted with an expert group to ensure there were no additional considerations identified in the study.Findings: The study results show that the main factors in adopting construction IR 4.0 technologies are 1) high implementation costs, 2) hesitation to adopt technologies, 3) lack of standards, 4) legal and contractual uncertainty and 5) complexity. By investigating these factors, cost and regulation issues can gradually be resolved, with construction firms implementing new technologies, educating workers and ensuring government involvement in training for skill development to support IR 4.0.Originality/value: The outcome of these efforts to resolve construction productivity would be beneficial in their industry impact on practice and digital transformation. Additionally, the results add to the body of knowledge for construction practitioners and technology developers to work together efficiently on the implementation of construction 4.0 technologies.