ANALISIS KINERJA JALAN LINGKAR SELATAN SALATIGA

Salatiga City is known as a city with a cool climate and beautiful natural scenery. Its strategic location between Semarang City and Surakarta City, makes this city a natural and culinary tourism destination. Due to the dense traffic flow passing through Salatiga City, especially those heading to Surakarta, the Salatiga South Ring Road (JLS) was built. One of the points prone to congestion in this area is in the Kumpulrejo area, Argomulyo District, this is due to the existence of unofficial U- turns because they are only coordinated by local residents without adequate signs. This situation is prone to congestion and even traffic accidents, especially during rain and at night. The research method was carried out by survey to obtain primary data. After that, the data was analyzed based on MKJI (Indonesian Road Capacity Manual 1997). From the survey results, the Salatiga South Ring Road has a volume at the morning peak of 1718.1 smp/hour, at the afternoon peak of 1160.8 smp /hour, at the afternoon peak of 1614.2 smp / hour. While the results of the calculation of road capacity obtained a maximum capacity of 2068.86 smp/hour. The speed on the Salatiga South Ring Road experienced a decrease in speed of 22.47%., from the planned flow speed (FV = 42.64 km/ hour <FVo 55 km / hour). The performance assessment on the Salatiga South Ring Road is currently less able to serve the volume, which is evidenced by the results of the calculation of the degree of saturation, namely 0.83 at the morning peak, 0.56 at the afternoon peak, and 0.78 at the afternoon peak, while the ideal maximum limit of road performance is to have a DS value <0.75. From the results of the Morning Peak Hour analysis, the service level is obtained with category D. namely the flow is approaching unstable, the traffic volume is high, the speed is still tolerable but is greatly influenced by changes in traffic flow conditions. At the afternoon peak hour, the service level is obtained with category C, which means the flow is stable but the speed and movement of vehicles are controlled by high traffic volume, and traffic density increases and internal resistance increases. At the afternoon peak hour, the service level is obtained with category D, namely the flow is approaching unstable, the traffic volume is high, the speed is still tolerable but is greatly influenced by changes in traffic flow conditions.
Key words: Degree of Saturation, Free Flow Speed, Road Capacity, MKJI 1997