Surakarta has several locations prone to congestion due to at grade highwayrailway crossing, one of which is in the Manahan area. The solution made by the government to overcome this problem was to build the Fly Over. Nevertheless, this condition affects the surrounding traffic condition, such as on Slamet Riyadi Street. This study aims to determine the characteristics of the traffic, and the existing performance of the road, then to compare it with the previous road performance. The primary data used are the existing condition of geometric, side frictions, volume and travel time which is then analyzed using IHCM 1997. The results show that during morning peak hour is obtained a volume of 1827.7 pcu per hour with the averages speed is 38.25 km per hour. The road performance expressed by the degree of saturation is obtained at 0.38. This value is smaller than before the change. This shows that the performance after the Fly Over is better than before. Nevertheless, both performances are still categorized in good condition.Abstraksi. Surakarta memiliki beberapa lokasi rawan kemacetan akibat adanya perlintasan sebidang antara jalan raya dengan jalan kereta api, salah satunya di daerah Manahan. Solusi yang dibuat pemerintah untuk mengatasi masalah tersebut yaitu membangun Fly Over. Meskipun demikian, hal tersebut mempengaruhi kondisi lalu lintas di sekitarnya, seperti Jl. Slamet Riyadi. Penelitian ini bertujuan untuk mengetahui kondisi karakteristik lalu lintas, dan kinerja ruas jalan tersebut saat ini, serta membandingkannya dengan kinerja sebelum perubahan. Data primer yang digunakan adalah kondisi geometrik, hambatan samping, volume dan waktu tempuh saat ini yang kemudian dianalisis menggunakan MKJI 1997. Hasil analisis menunjukkan saat periode puncak pagi diperoleh volume 1827,7 smp/jam, dengan kecepatan rata-rata waktu 38,25 km/jam. Kinerja ruas yang dinyatakan dengan derajat kejenuhan diketahui sebesar 0,38. Nilai tersebut lebih kecil dibandingkan dengan sebelum perubahan. Hal tersebut menunjukkan bahwa kinerja setelah adanya Fly Over lebih baik dibandingkan sebelumnya. Meskipun demikian keduanya masih dikategorikan dalam kondisi baik. Kata Kunci: fly over, karakteristik lalu lintas, kinerja jalan
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