Walkability is a measure that assesses the extent to which roadways are conducive to pedestrian walking. Walking, being an eco-friendly means of transportation, has many advantages including minimized adverse environmental effects, enhanced individual autonomy, and improved physical well-being. The aim of this research is to calculate an enhanced Walkability Index by considering nine variables. Additionally, it aims to assess the significance and effectiveness of the new sidewalk on Russian Conf. Blvd. in influencing pedestrian perceptions. Furthermore, it aims to evaluate the correlation between walkability and accessibility factors, as well as the availability of supporting facilities and convenience aspects in Phnom Penh City. The research employed the modified Global Walkability Index (GWI) technique, which was selected based on the specific attributes of pedestrians in major Asian cities. The findings of this study indicate that using the road diet idea can enhance the walkability of sidewalks. The Phnom Penh area can act as an example for other areas by effective as a pilot project site for the transformation of pathways. The findings of this study can help as instructive examples for global readers on the transformation of a car-centric city into one that prioritizes walkers, with potential implications for enhancing the importance of walkability and public transportation users. Furthermore, the walkability criteria were divided into four distinct categories to establish the correlation between walkability and each of the four features. The IPA results have discovered four criteria that are both significant and high-performing. Moreover, the findings of the correlation study validated a robust association between walkability and accessibility, together with the presence of supporting infrastructure.