Finding a simple and less expensive method to assess and improve sidewalk and corridor conditions in developing countries is essential in order to motivate more people to walk. This study aimed to design and test a method that uses direct observations of driver behavior and street measurements to assess sidewalk and corridor walkability in developing countries. The proposed method includes different walkability indicators related to sidewalk features, crossing facilities, sidewalk facilities, and driver behavior to provide one score that represents the walkability of a sidewalk and one that represents the walkability of a corridor. The method was tested on streets from 10 neighborhoods in the city of Doha, Qatar. The results indicated that the developed method was easy to use and could efficiently measure various indicators, illustrating that it can be used to evaluate corridors with different characteristics to identify and rank areas that require improvement. The study's findings will provide maintenance agencies, policymakers, and practitioners in developing countries with a simple, efficient, and cost-effective method to evaluate, plan, rank, and improve the walkability of sidewalks and corridors. index measuring poverty, literacy, education, and life expectancy, in addition to other factors. A key characteristic of a developing country is poor infrastructure. Some of these problems include narrow streets [12,13], obstructions [14,15], lack of shaded corridors [16], appealing elements [17], and aggressive driving against pedestrians [18].Sidewalks are the main infrastructure for pedestrian mobility. Although studying the condition of sidewalks and their impact on walkability has received considerable attention in different countries, few studies investigating sidewalks in developing countries exist. As such, the present study strives to investigate walkability in a developing country properly. The first aim of this study is to design a simple measuring method that assesses sidewalks and corridors in developing countries. The second aim is to apply the method to real-life data to check its ability to assess the sidewalk walkability in Qatar, a developing country, effectively. As a developing country in the Middle East, Qatar is a unique case. Even though Qatar is considered as one of the most advanced countries in the region-thanks to having one of the highest gross domestic product per capita in the world-the country is still considered a developing country according to the United Nations for several reasons. For instance, Qatar's infrastructure, particularly the transportation one, is facing problems. Some of these problems were caused by the rapid continuous growth of the population, resulting in heavy pressure on the existing transportation infrastructure, a low-quality non-motorized transportation infrastructure, traffic safety problems, noise and air pollution concerns, coordination issues between different public agencies, and a shortage in experienced transportation professionals for management, planni...