EVALUASI KINERJA SIMPANG SIYONOHARJO, TANPA DAN DENGAN LAMPU LALULINTAS BERDASARKAN METODE MKJI

Abstract The purpose of this study is to evaluate of existing unsignalized Siyonoharjo intersection and its performance after traffic signal is implemented using MKJI 1997. This study also predict its next 10 year performances. The primary data are road geometric, traffic flow and composition, and secondary data are intersection site plan, population and traffic growth rate. Based on 6% traffic growth rate, in 2003 degree of saturation is 0.66 and drastically increase up to 1.18 in 2013. By applying traffic signal in existing geometric, the degree of saturation of 2 and 4 phase are 0.89 and 0.76 respectively, with time cycle are 106.2 s and 76.7 s. After widening the approach of intersection, the de- gree of saturation are 0.66 and 0.56, with time cycle are 42.3 s and 50 s. Keywords: Cycle time, Degree of Saturation, Signalized, Unsignalized Intersection

Traffic Accident’s Model, Interaction Among The Driver – Vehicle – Carriageway Width in Highway Geometric Design’s Consistency

Highways as a transportations infrastructure have an important role to sustainability of transportation activity, many research abroad produce the models inform that when consistency of geometric design concerned so the traffic safety will be raise. The object of this research is to identify of inconsistency of alignment’s design at black-spot located in curve and developed the model which tell the relation of one of geometric design’s consistency is horizontal alignment and speed operational with traffic accident rate. The model means more appropriate for street condition and speed operation of vehicle in Indonesia. Secondary data acquisition of accident will be evaluated for horizontal alignment condition at black spot point of view. Running speed as a dependent variable, the degree of curvature as an independent variable. Result indicate the relation : Motor Cycle = 70.320 ( ), Light Vehicle = 67.121 ( ) and Heavy Vehicle = 50.790 ( ). The model inform opposed among operation speed and degree of curvature, means high operation speed caused the rate of degree of curvature low or choice of curve’s radius is magnitude, this values consistent for all the modal. This result also inform the behavior motor cyclist easy more maneuver such the condition of street’s geometric

The influence of vehicle speed changes at mechanistic performance of asphalt mixture

Asphalt mixture is a viscoelastic material. Several factors affect the behavior of a viscoelastic material. Temperature and loading time are the most critical of these parameters. Vehicle speed affects time loading, therefore it’s very important to know the influence of vehicle speed changes in mechanistic performance of bitumen and asphalt mixture with different aggregate gradation types, namely dense graded and gap graded. Based on data of bitumen penetration, bitumen softening point, volume of bitumen, volume of aggregate and volume of voids, mechanistic performance of bitumen and asphalt mixture influenced by vehicle speed changes can be predicted using the software BANDS 2.0. The variation of vehicle speed will be carried out to see its significance. The results of the BANDS 2.0 simulation show that vehicle speed changes influence bitumen stiffness, asphalt mix stiffness and fatigue life asphalt mix. The higher the vehicle speed is, the higher bitumen stiffness and asphalt mix stiffness will be, but fatigue life asphalt mix will be lower. At the same vehicle speed, asphalt mix stiffness of dense graded mixture will be higher than gap graded mixture. The other way for fatigue life asphalt mix

Strategy toward sustainable local road network infrastructure

With massive explosion of population, the urban inhabitants will rise up to 64% in 2050. This condition increases the pressure on the existing urban road infrastructure and requires substantial maintenance and often expansion of the inter/rural-urban as well as local road as mobility of people and goods upsurge extensively. The construction of these new network and maintenance of existing road infrastructures consumes huge natural resources which further might increase volume of waste and greenhouse gas emission. Currently, approximately 28% provincial road and 41% local (urban) road network in Indonesia are in unsatisfactory condition. There is obvious demand to improve regional road with minimum ecological impact despite limited amount of resources and budget. In achieving sustainable road network, local authorities require a strategy in tackling this complex, large-scale and interconnected problems. This study aims to formulate relevant strategy for local authorities – urban or inter rural-urban level within a province – in operation, maintenance and development of road network by applying strategic management principles. Rational decision model was used in strategy formulation in three consecutive steps: input stage, Matching stage, and Decision Stage. Rational decision model was also used in strategy establishment taking into account the Environmental Minister regulation and some important issues in the Department of public works employing sustainability concept. The strategy proposed is believed to be ecologically sound (environmentally friendly) while improving local road network quality