Bottleneck Effect Caused by Motorcyclist Presence in the Traffic Flow on Kerten Signalized Intersection

The number of motorcycles in Surakarta has been increasing dramatically since several years ago. This condition was engendering phenomena such as bottleneck and congestion including around an intersection. research aims to determine the repercussions from viewpoint traffic flow, timing signal, driver's behavior. flow analyzed based on Indonesian Highway Capacity Manual, analysis determined using Yuan model, behavior descriptive statistics. data consisted secondary sourced by a Local Government primary field survey at Kerten Intersection. Behavior were obtained questionnaires Google Forms reached 300 participants. result shows that behaviors point view are causing congestion. It is because when motorcycle volume added often exceeds 1, motorcycle's habits affecting driving's way other riders drivers. expected be source information well basis for comparison further authors researchers. shall provide viable with viability advantages those interested same subject research.