scholarly journals Analisis Simpang Bersinyal Pada Simpang 4 Jl. Siliwangi Kota Tasikmalaya

2020 ◽  
Vol 3 (2) ◽  
pp. 70
Author(s):  
Farhan Sholahudin ◽  
Agi Rivi Hendardi
Keyword(s):  
Performance Analysis ◽  
Cycle Time ◽  
Transportation Problem ◽  
Degree Of Saturation ◽  
Critical Number ◽  
Phase Cycle ◽  
Traffic Conflicts ◽  
Traffic Conflict ◽  
Phase Setting ◽  
Congestion Problems

Transportation problem is one of the problems that is faced in Tasikmalaya City especially at the intersection. Congestion problems and traffic conflicts often occur at a signal especially in intersection on Siliwangi road Tasikmalaya. One of the efforts made to reduce traffic conflicts and optimize the performance of the junction is by setting up the junction and optimizing the Simpang. The purpose of this research is to know the performance of intersection on Siliwangi road Tasikmalaya and provide recommendations for precise handling, as well as analyzing the traffic conflicts that occurred in the junction. The method used in the performance analysis of the junction signal is to use the calculations in the PKJI 2014, while for analysis of traffic conflicts used to determine the severity of the conflict at the intersection on Siliwangi road Tasikmalaya is using the method Traffic Conflict Technique (TCT). After analysis, the performance in the intersection on Siliwangi road Tasikmalaya Tasikmalaya has approached the critical number of the degree of saturation (DS) of 0.7 with level D. In addition to these problems, there is a traffic conflict crossing as many as 230 events (55%), merging as many as 145 events (35%) and diverging as many as 41 occurrences (10%). With the handling and recommendation of phase setting and cycle time setting, it is proven to suppress and minimize the decline of junction performance level to C level with the value of saturation of 0.58. This will also impact the reduction in the amount of traffic conflicts that occur.Keyword : intersection, traffic conflict, PKJI 2014, phase, cycle time

scholarly journals ANALISIS TINGKAT PELAYANAN JALAN MENGGUNAKAN PERANGKAT LUNAK VISSIM PADA SIMPANG BERSINYAL CISALAK, KOTA DEPOK

LOGISTIK ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 1-3
Author(s):  
Dadang Suyadi ◽  
Rakha Imaulanda
Keyword(s):  
Natural Gas ◽  
Cycle Time ◽  
Degree Of Saturation ◽  
Level Of Service ◽  
Traffic Light ◽  
Phase Current ◽  
The Road ◽  
Toll Road ◽  
Traffic Conflicts ◽  
Long Time

The intersection of the Cisalak I toll gate in Depok City is the intersection that connects the road. Ir. H. Juanda, Jalan Raya Bogor, Jalan Gas Alam, and of course the Cisalak I highway exit & exit. By having 6 intersection arms, of course there are many traffic conflicts that occur at the Cisalak I toll gate intersection, one of which is a delay in the intersection arm long so that congestion in each intersection during rush hour always occurs and coupled with the cycle time of the traffic light which takes quite a long time so the long queue occurs. The purpose of this study is to know more about the performance of the traffic. The method used is to observe directly to the research location by observing the volume of vehicles with various types, the phase current of the vehicle passing at the intersection, and the cycle time of the traffic light, and by using Vissim software as modeling and getting the results of the count. The results of the study found capacity on the Bogor Highway (Jakarta direction) with a total of 771.69 , Jalan Ir. H. Juanda is 542.92, Bogor Highway (Bogor direction) is 612.21, and Cijago / Cisalak & Natural Gas Toll Road is 538. and the value of degree of saturation in each intersection is Highway Bogor (direction Jakarta) amounting to 2.96, Jalan Ir. H. Juanda is 3.52, Bogor Highway (Bogor direction) is 2.77, and Cijago / Cisalak & Gas Alam Toll Road is 2.95, so the level of service results in all F crossing arms which means the congestion condition takes up the duration long enough.

Analysis of Pedestrian Conflicts with Left-Turning Traffic

1996 ◽  
Vol 1538 (1) ◽  
pp. 61-67 ◽  
Author(s):  
Dominique Lord
Keyword(s):  
Data Collection ◽  
Statistical Tests ◽  
Computer Programs ◽  
Signalized Intersections ◽  
Laptop Computer ◽  
Expected Number ◽  
Positive Correlation ◽  
Data Collection Process ◽  
Traffic Conflicts ◽  
Traffic Conflict

The interaction between pedestrians and left-turning vehicles at signalized intersections are examined using the traffic conflict technique. Paramount was a comparison of the safety of left turns at two types intersections: T-intersections and X-intersections (cross-intersections). Previous research has indicated that T-intersections are more dangerous to pedestrians. In preparation for the comparison several traffic conflict definitions and their applications to pedestrians were evaluated. Use of a laptop computer for data collection was tested. Eight sites taken from intersections in Hamilton, Ontario, Canada, were selected. A conflict recording methodology was developed for T-intersections and X-intersections that consisted of recording data at various times along the paths of pedestrians and left-turning vehicles, and recording traffic conflicts. Two computer programs were written for the data collection process: one for vehicles and one for pedestrians. Several statistical tests to relate traffic conflicts and the expected number of accidents were performed. These tests indicate that a positive correlation between traffic conflicts and expected number of accidents exists; they also suggest that T-intersections have a higher traffic conflict rate than X-intersections.

scholarly journals Evaluasi Kinerja Apill dan Geometrik Simpang 3 Sungai Bengkel Kota Bengkalis

2021 ◽  
Vol 18 (2) ◽  
pp. 197-206
Author(s):  
Nursafika Syafika ◽  
Muhammad Idham
Keyword(s):  
Cycle Time ◽  
Slow Motion ◽  
Public Works ◽  
Degree Of Saturation ◽  
Traffic Light ◽  
Traffic Jam ◽  
The North ◽  
Calculation Results ◽  
Bottle Neck ◽  
Intersection Geometry

Third junction of Sungai Bengkel was a Signalized Intersection which a hasn’t have traffic jam ,which has three approach, are North approach, West approach and East approach. However, the alinyemen for the North approach has problems that make it difficult for vehicles, especially four-wheelers to turn because the effect bottle neck resulting in the slow motion of the vehicle and change of phase time . the problem solving, the evalution of traffic light and intersection geometry were carried out by widening  the alinyemen for the North approach and East approaches and doing changes in cycle time. The purpose of evaluating the performance of traffic light and Geometrics at the third intersection of Sungai Bengkel is to determine the value of the degree of saturation and to know the performance of the intersection.At the intersection planning, it refers to the PKJI 2014 for Intersection Performance, while for the Geometrics it refers to Module 4 of the Ministry of Public Works and Public Housing on Geometric Planning of Plane Intersections.Based on  the calculation results of the Sungai Bengkel junction performance indicate that, the degree of  saturation  < 0.85,which is 0.529 for North,  0.537 for East, and 0.570  for West .With the radius is 15 m, and the cycle  time of traffic light 50 second, with the delay time  as long as 17 second/pcu

scholarly journals Peningkatan Keselamatan Pada Simpang Dengan Menerapkan RHK Sepeda Motor (Studi Kasus Simpang Empat Bersinyal Srikandi Di Kabupaten Pasuruan)

2020 ◽  
Vol 3 (1) ◽  
pp. 40
Author(s):  
Yordan Suryoatmojo
Keyword(s):  
Economic Development ◽  
Performance Analysis ◽  
Queue Length ◽  
Traffic Management ◽  
Degree Of Saturation ◽  
Average Delay ◽  
The North ◽  
Qualitative Descriptive ◽  
Quantitative Descriptive ◽  
Performance Results

Pasuruan Regency is one of the regions in Indonesia which is precisely located in the province of East Java. With a very rapid economic development will certainly affect the flow of traffic, especially at the intersection. One of the most populous intersections is the Srikandi Four Intersection which is located in Pandaan District. To improve safety at an intersection, traffic management is necessary. This study aims to analyze the performance of the intersection by using the MKJI calculation and calculate the area of the Special Stop Room (RHK) of a motorcycle that refers to the Guidelines for Designing Motorcycle RHK at a Signed Intersection in the Urban Area planned on Jalan R.A. Kartini and Jalan A. Yani. The method used to plan the RHK of this motorcycle uses quantitative descriptive methods and qualitative descriptive methods. Intersection performance results obtained from calculations for the existing conditions of the North approach capacity (Jalan Urip Sumoharjo) 252 pcu / hour, queue length 131 m, degree of saturation of 0.85. Eastern approach capacity (Jalan Pahlawan Sunaryo) 265 pcu / hour, queue length 146 m, degree of saturation 0,85. South approach capacity (Jalan R.A. Kartini) 579 pcu / hour, queue length 134 m, degree of saturation of 0.85. The Western approach capacity (Jalan A. Yani) is 730 pcu / hour, the queue length is 104 m, the degree of saturation is 0.85, while the average delay is 59.10 seconds / pcu. From the performance analysis of the intersection, the length of the RHK motorcycle for the R.A. Kartini is 11.5 meters long, while for Jalan A. Yani it is 10.3 meters long.

Trajectory-Based Measurement of Signalized Intersection Capacity

2019 ◽  
Vol 2673 (10) ◽  
pp. 370-380 ◽  
Author(s):  
Walid Fourati ◽  
Bernhard Friedrich
Keyword(s):  
Cycle Time ◽  
Degree Of Saturation ◽  
Limiting Factor ◽  
Signal Timing ◽  
Flow Rates ◽  
Practical Applications ◽  
Road Intersections ◽  
Good Signal ◽  
Saturation Flow ◽  
Over Time

Capacities of road intersections are a limiting factor and crucial for the performance of road networks. Therefore, for purposes of intersection design and of optimal signal timing, numerous methodologies have been proposed to either estimate or directly measure the capacity of single movements at road intersections. However, both model-based estimation and direct measurement suffer from the large effort that is needed to gather the relevant data. Even worse, once the data are collected they only represent a snapshot of the capacity over time. This paper proposes an alternative approach to estimate capacity of signalized road intersections over time using only automatically generated trajectories of probe vehicles. The obtained capacity can be used to evaluate the effective degree of saturation using real demand, or to assess hypothetic different conditions in demand or signaling. The cyclic operation of signalized intersections allows for the accumulation of trajectories, and thus in practical applications for the compensation of potentially low penetration rates. Within a sequential process the intersection’s cycle time and the approach green time and saturation flow rates are determined. The determination of the cycle time and the green times is based on an existing approach. The derivation of the saturation flow rates relies on its direct dependency to the saturation time headway and uses two parameters to be calibrated. Testing with a commercial dataset on an intersection in Munich produced a good signal timing estimation and saturation flow values that are comparable to a calculation based on the German guideline.

Application of Extreme Value Theory for Before-After Road Safety Analysis

2019 ◽  
Vol 2673 (4) ◽  
pp. 1001-1010 ◽  
Author(s):  
Lai Zheng ◽  
Tarek Sayed
Keyword(s):  
Extreme Value Theory ◽  
Safety Analysis ◽  
Value Theory ◽  
Extreme Value ◽  
Data Traffic ◽  
Crash Data ◽  
Safety Improvement ◽  
Traffic Conflicts ◽  
Traffic Conflict ◽  
Generalized Pareto Distributions

Because of well-recognized quality and quantity problems associated with historical crash data, traffic conflict techniques have been increasingly used in before-after safety analysis in recent years. This study proposes using an extreme value theory (EVT) approach to conduct traffic conflict-based before-after analysis. The capability of providing confident estimation of extreme events by the EVT approach drives the before-after analysis to shift from normal traffic conflicts to more serious conflicts, which are relatively rare but have more in common with actual crashes. The approach is applied to evaluate the safety effects of converting channelized right-turn lanes into smart channels, based on traffic conflicts defined by time to collision (TTC) and collected from three treatment intersections and one control intersection in the city of Penticton, British Columbia. Odds ratios and treatment effects are calculated from extreme-serious conflicts, the frequencies of which are estimated from the generalized Pareto distributions of traffic conflicts with TTC⩽0.5 s. The results show approximately 34% reduction in total extreme-serious conflicts (i.e., combining merging conflicts and rear-end conflicts), indicating overall a remarkable safety improvement following the smart channel treatment. This finding is consistent with the analysis result based on traffic conflicts with TTC⩽3.0 s. It is also found that the reduction in extreme-serious merging conflicts is small and insignificant. This is caused by the phenomenon that TTC values of merging conflicts become smaller after the treatment, and it is possibly because drivers become more aggressive with the better view of approaching cross-street traffic provided by the smart channel.

scholarly journals Using Rapid Cycle Improvement (Plan, Do, Study, Act) to Design a Scalable Appointment Scheduling System for Complex Oncology Clinical Trials at an Academic Cancer Center

2018 ◽  
Vol 14 (9) ◽  
pp. e591-e601
Author(s):  
Avantika H. Dang ◽  
Lauren N. Gjolaj ◽  
Helen Peck
Keyword(s):  
Cycle Time ◽  
Value Added ◽  
Appointment Scheduling ◽  
Cancer Center ◽  
Capacity Analysis ◽  
Study Phase ◽  
Full Time ◽  
Billing Data ◽  
Takt Time ◽  
Phase Cycle

Purpose: This study’s purpose was to optimize the efficiency of and to design a scalable research scheduling team to meet the growing demands of an academic cancer center with increasing clinical trial accruals. Methods: The Plan, Do, Study, Act improvement methodology was deployed to increase the efficiency of research scheduling, to reduce non–value-added (NVA) activities, and to reduce cycle time to meet takt time. In the Plan phase, voice-of-the-customer interviews were conducted. In the Do phase, the baseline workflow was mapped and billing data were analyzed. In the Study phase, cycle time, takt time, and capacity analysis metrics were calculated at baseline. In the Act phase, interventions were implemented to increase efficiency by reducing NVA activities and increasing value-added activities, and metrics were reassessed after intervention. Results: An 8% increase in appointment requests was noted from baseline to after intervention, and the cycle time for appointment scheduling decreased by 11%, demonstrating increased efficiency. Process steps decreased from 15 to 10, eliminating NVA activities and rework and waiting, two types of waste. Conclusion: Although efficiency increased, the number of total appointments scheduled weekly increased by 4%, resulting in a reduced takt time, or a shorter time to schedule each appointment to meet demand. A capacity analysis demonstrated that even after interventions, an additional 0.5 full-time employee is required to reduce cycle time to equal takt time. Capacity analysis creates a scalable framework for the scheduling team and facilitates movement from reactive to proactive staffing, which can be applied throughout the research enterprise.

scholarly journals Road safety assessment in preferential bus lanes through field analysis and microsimulation of traffic conflicts

2019 ◽  
pp. 87-100 ◽  
Author(s):  
Julián Darío Julián Otero-Niño ◽  
Juan David Heredia-Castiblanco ◽  
Paula Daniela Fonseca-Agudelo ◽  
Sebastián Cabrera-Pinzón ◽  
Alejandro Gómez-Mosquera ◽  
...  
Keyword(s):  
Public Transport ◽  
Road Safety ◽  
Safety Assessment ◽  
Stopping Time ◽  
Field Analysis ◽  
Road Users ◽  
Traffic Conflicts ◽  
Traffic Conflict ◽  
Field Information ◽  
The One

Preferential bus lanes are a widely use strategy to promote travelers to use public transport instead of private cars. Considering its relevance in the urban transportation planning and operation, it is crucial to evaluate them in terms of the operation and safety externality. We performed a road safety assessment in preferential public transport lanes with complex driving environment using a preventive approach on the 7 th Avenue, in Bogota (Colombia), between 39 th Street and 45 th Street. A detailed study of traffic conflicts was carried out under the guidelines of the Swedish technique, which uses the Time to accident and Conflicting speed to establish the severity of a conflict. A traffic conflict is defined as an incident where, if two road users on collision course maintain their speed and trajectory constant, the crash between them will be imminent. With the field information, we calibrated a VISSIM microsimulation model that correctly replicates its traffic operation. Using the SSAM tool, we validated the base model to identify the simulated traffic conflicts in VISSIM and compared them with the observed conflicts. Under the calibrated environment, we developed and assessed three different scenarios of countermeasures to reduce the number of conflicts observed. As a result, we found that the safest scenario is the one established in the regulations that normalize the operation in preferential lanes, currently not obeyed by most users. Based on our results, we recommend an adjustment in the normative measures, including regulating the stopping time and stopping zones of private vehicles and taxis.

scholarly journals Safety Performance Evaluation of a Three-Leg Unsignalized Intersection Using Traffic Conflict Analysis

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Guoqiang Zhang ◽  
Jun Chen ◽  
Jingya Zhao
Keyword(s):  
Prediction Model ◽  
Video Camera ◽  
Conflict Analysis ◽  
Safety Performance ◽  
Time To Collision ◽  
Time Headway ◽  
Independent Variables ◽  
Minor Road ◽  
Traffic Conflicts ◽  
Traffic Conflict

Traffic conflicts were used to evaluate safety performance of a three-leg unsignalized intersection. With the aid of a video camera, data were collected at the intersection and 15-second time span was used in each observation to overcome the drawbacks of traditional methods of traffic conflict analysis. Time to collision (TTC), a widely accepted indicator, was used to identify whether an interaction between two vehicles was a traffic conflict. By using Poisson regression, a prediction model for traffic conflicts at the intersection was developed. Based upon the model, assuming that other factors remain constant, when time headway or speed of eastbound traffic on major road, which is crossed by left-turning traffic from minor road, increases, the number of traffic conflicts at the intersection decreases. When volume of left-turning traffic on minor road or speed of left-turning vehicles on minor road increases, the number of traffic conflicts at the intersection increases if other factors remain constant. Explanations for the influence of the factors, which were represented by independent variables of the prediction model, were then analyzed in detail.

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