<![CDATA[In Wonosobo Regency, Central Java, mountainous terrain and high economic activity have contributed to a significant increase in motor vehicles. This growth has placed pressure on road infrastructure, particularly at strategic intersections such as the Pasar Kertek Roundabout. This unsignalized four-leg intersection connects traffic from several directions and carries thousands of motorized and non-motorized vehicles each day. The combination of local traffic, regional freight transport, and side friction from traditional market activities causes vehicle conflicts, long queues, and congestion. This study analyzes the intersection’s performance in terms of capacity, degree of saturation, delay, and queue probability, and determines its level of service (LOS). A quantitative approach was used, following the 1997 Indonesian Highway Capacity Manual (MKJI). Primary data on traffic volume, side friction, and road geometry were collected alongside secondary data. The highest peak-hour traffic volume occurred on Monday, 4 May 2026, from 07:00 to 08:00 Western Indonesian Time, reaching 11,284 vehicles/hour, equivalent to 6,568.5 passenger car units/hour (pcu/hour). Based on MKJI 1997, the capacity of the roundabout’s weaving sections ranged from 1,459.26 pcu/hour (section AB) to 2,243.92 pcu/hour (section DA). All sections were oversaturated, with degrees of saturation exceeding the specified threshold of 0.85: 1.17 for AB, 1.70 for BC, 1.69 for CD, and 1.26 for DA. These conditions resulted in substantial traffic delays and high queue probabilities throughout the roundabout. All weaving sections were classified as LOS F, indicating severely congested flow. Traffic engineering and area management measures are therefore needed, including restricting access to Sukardi Road to market operations, enforcing rules against unauthorized parking and roadside motorcycle taxi stands, relocating street vendors, and reducing side friction caused by public transport vehicles stopping on the road shoulder.]]>
