Seongnam City Targets the "Balloon Effect" of Chronic Congestion with Comprehensive Road Network Analysis
Seongnam City Launches Improvement Plan for Congestion-Prone Areas
Comprehensive Review from Cause Analysis to Road Network Assessment and Basic Design
Basic Designs Include Lane Adjustments and Intersection Improvements... Completion Expected by July 2027
Seongnam City, Gyeonggi Province (Mayor Shin Sang-jin), has launched the development of a comprehensive improvement plan to address recurring traffic congestion throughout the downtown area.
On August 6, Seongnam City announced that it has begun the “Congestion-Prone Section Improvement Planning Service,” which aims to identify the causes of traffic congestion and to prepare improvement measures and basic designs considering the entire road network. The project will run until July 2, 2027.
The city plans to select congestion-prone areas by analyzing objective data such as traffic volume, travel speed, and vehicle queue lengths, as well as by reflecting citizen opinions, survey responses from bus drivers, and on-site feedback from related institutions such as the police.
Among the selected sections, the city will identify spots where application of Traffic System Management (TSM) techniques is suitable and will develop tailored improvement measures and basic designs based on site conditions. TSM is a method that reduces congestion within a short period and at relatively low cost by efficiently utilizing existing roads and traffic facilities, rather than constructing or widening roads on a large scale.
Major improvement measures under review include installation of dedicated left-turn and right-turn lanes, adjustment of turning regulations, improvements to intersection layouts, and changes to signal systems and traffic operation methods.
The city will conduct a comprehensive analysis not only of vehicle flow at specific intersections but also of pedestrian environments, public transportation use conditions, and overall traffic safety. To prevent the so-called “balloon effect,” where improvements in one location cause congestion at adjacent intersections or connecting roads, Seongnam will also examine the impact on the overall road network.
To ensure that the proposed improvements can be implemented as actual projects, the city will also consider road structure, conditions for installing traffic facilities, relevant regulations, and project costs. In addition, prior consultations with the police and other related institutions will be conducted to enhance the feasibility of the projects.
An official from Seongnam City stated, “It is difficult to identify the exact causes of traffic congestion by looking only at a single intersection or specific time period. We will develop effective improvement measures that citizens can directly feel by comprehensively analyzing vehicle flow, pedestrian movement, public transportation, and traffic safety, as well as carefully examining the effects on the surrounding road network.”
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Based on the results of the study, Seongnam City plans to gradually implement congestion-prone section improvement projects by comprehensively assessing the urgency of each project, the anticipated effectiveness of the improvements, and their on-site applicability.
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