Kajian Ulang Perencanaan Geometrik Simpang Simpang Tak Bersinyal Berdasarkan Highway Capacity Manual

Simpang Empat Jeuram Nagan Raya sering disebutkan oleh masyarakat setempat ”Simpang Peut” merupakan jalur utama jalan arteri kota melayani pergerakan lalu lintas antar kabupaten atau antar provinsi, yang berada di Kecamatan Kuala Kabupaten Nagan Raya. Simpang tersebut memiliki empat lengan, melayani arus 4 lajur jalan utama bermedian dan 2 lajur jalan minor menghubungkan jalur arah perkantoran, perumahan penduduk, perdagangan dan sebagai jalur menuju ke pusat kota. Permasalahan diangkat dan juga menjadi tujuan penelitian bagaimana kinerja persimpangan terhadap volume lalu lintas terjadi di empat lengan dan membedakan selisih perhitungan sekarang terhadap penelitian terdahulu. Batasan pembahasan yakni lokasi penelitian di Simpang Empat Jeuram, kinerja simpang berdasarkan metode HCM 1993, hambatan samping dan tidak memperkirakan penelitian terdahulu. Berdasarkan hasil, volume arus yang terjadi 3.310 smp/jam dengan komposisi arus kendaraan 2.789 smp/jam. Kapasitas 4.009 smp/jam berada diatas volume yang ada dikategorikan tidak macet atau tidak jenuh. Hambatan samping 1.328 kejadian dikategorikan daerah niaga dan aktivitas pasar sisi jalan sangat tinggi. Derajat kejenuhan 0.70 < DS (DS < 0.80 - 0.90) dengan rata-rata delay 7.95 detik/smp dan panjang antrian 40% - 20% dengan tingkat pelayanan D dimana arus tidak stabil dan kadang harus memperlambat kecepatan 43 km/jam. Terkait penelitian terdahulu menunjukkan hasil signifikan, karena peningkatan kendaraan terus meningkat 75% dalam kurun waktu 3 tahun terakhir.

Identification of Operational Design Domain for Autonomous Truck Mounted Attenuator System on Multilane Highways

The Autonomous Truck Mounted Attenuator (ATMA) vehicle system is a technology that leverages connected and automated vehicle (CAV) capabilities for maintenance of transportation infrastructure. Promoted by FHWA and state departments of transportation (DOTs), it is a niche CAV application in leader–follower style, intended to remove DOT workers from the following maintenance truck, to reduce fatalities in work zones. Because practicable guidance for deployment of this technology is largely missing in MUTCD, state DOTs have been making their own deployment criteria. In this manuscript, we focus on the operational design domain (ODD) problem—under what traffic conditions should ATMA be deployed. Modeling efforts are first focused on the derivation of an effective discharge rate that can be associated with a moving bottleneck caused by slow-moving ATMA vehicles on a multilane highway. Then, based on the demand input and discharge rates, microscopic traffic flow models calculate vehicle delay and density, which the Highway Capacity Manual (HCM) suggests are key indicators of a multilane highway’s level of service (LOS). In this way, the linkage between AADT and LOS is analytically established. NGSIM data is used for the model validation and shows that the developed model correctly captures the effective discharge rate discount caused by moving bottlenecks. The modeling results demonstrate that roadway performance is sensitive to the K factor and D factor, as well as the operating speed of ATMA and, if LOS = C is a desirable design objective, a good AADT threshold to use would be around 40,000 vehicles per day.

Evaluating the efficiency of investments in transport infrastructure in the subjects of the Russian Federation based on the DEA methodology

Subject. The article addresses comprehensive comparative assessment of return on investment in transport infrastructure in the constituent entities of the Russian Federation for 2017–2019, based on the DEA methodology. Objectives. We determine leaders and outsiders among regions, based on the DEA-analysis of investment performance in the transport sector, rank them on the basis of aggregated estimates of comparative efficiency. Methods. The research draws on the methods of systems analysis, mathematical, economic, statistical analysis, decomposition, and aggregation. We employ the data of Rosstat and the Ministry of Transport on constituent entities of the Russian Federation for 2017–2019. Results. The aggregated estimates of comparative efficiency of investments in transport infrastructure, taking into account the variable effect (VRS), have been determined for the first time. We rank the constituent entities of the Russian Federation, depending on the efficiency of investments in transport infrastructure. Conclusions. The performed analysis creates information basis for assessing and improving the regional transport policy, developing and implementing a set of measures, aimed at increasing transport accessibility and highway capacity. The findings may enable to monitor and enhance the efficiency of budgetary spending on transport infrastructure facilities.

Effect of increasing rate of tricycles on saturation flows at signalized intersections in Uyo, Akwa Ibom State, Nigeria

This study involves understanding the effect of tricycles on saturation flow rate at signalized intersections. The goal is to show that intersection dominated by tricycle experience congestion especially at peak periods (morning and evening). This was done by collecting vehicular traffic data, signal timing and geometric data from five (5) signalized intersections at ten (10) cycles. The period covered October, 2015 to June, 2016 for four working days of the week (Mondays, Tuesdays, Wednesdays, and Fridays), between the hours of 7:30 am–9:30 am and 4:30 pm– 6:30 pm. The duration of data collected covered both rainy and dry seasons. Average vehicular departure time during green time was determined and saturation flow obtained through field measurement by the ratio of average vehicular departure time to green time. Highway Capacity Manual method was also used to obtain saturation flow at each study approach. Saturation flow obtained through field measurement and Highway Capacity Manual were compared using independent t-test having t-value of 4.239 and P-value of 0.000 at 20 degree of freedom were obtained. The analysis indicated that P-value is less than 0.05, hence the mean of Highway Capacity Manual 2000 Model (5918.60) was significantly higher than the field measurement (4687.50). The result indicated that the increasing rate of tricycle with non-lane discipline causes congestion at signalized intersection. The findings suggest that the widely used Highway Capacity Manual is not appropriate for determining saturation flow for a mixed traffic with increasing rate of tricycle coupled with non-lane discipline traffic condition. From the analysis, it is recommended that Government should give priority to use of buses as a means of mass transit system so that it can accommodate more commuters than tricycle.

Effect of side frictions on level of service of DI Panjaitan street in Cawang - East Jakarta

DI Panjaitan street has a heavy traffic congestion on the-day-of-workday especially during peak periods from 7 am to 9 am and 5 pm to 7 pm. This research aims to determine the level of service of DI Panjaitan street especially during peak hours that caused by the traffic flow and the side friction of road. The level of service was determined by using Indonesian Highway Capacity Guidance or IHCG 2014 and the most influential variable of the side friction was determined by using multiple linear regression analysis in SPSS. The research shows that DI Panjaitan street has the level F on Monday during peak hours from 7 am to 9 am and between 5 pm to 7 pm and level from C to D occurred from Tuesday to Friday. The most influential variable of the side friction was determined by equation 0.157+ 0.002 X1 + 0.001 X2 + 0.002 X3. The research shows that the park & stop vehicle, exits + enters, not motorized vehicle, strongly correlates to the value of degree saturation with a correlation coefficient (R) of 0.792.