During commuting hours, the number of vehicles on main line roads increases rapidly. As a result, traffic jams occur. When a traffic jam occurs, some vehicles will flow into nearby residential areas roads that can be used as a “loophole.” In this study, the authors investigated multiple roads known as “loopholes” and evaluated their traffic environments using ETC2.0 data and Geographic Information System (GIS) information. It was also clarified that “loophole” roads have characteristics such as “high number of traffic volume” and “high average velocity.” These are characteristics that have a negative impact on pedestrian safety in “loopholes,” which have many sections without sidewalks. Therefore, it is important to take countermeasures to improve pedestrian safety on “loophole” roads.