scholarly journals Accident Prediction based on Integrated Design Consistency with the Lower Number of Vehicles/Traffic Volumes (due to Health Disaster/COVID-19)

2020 ◽  
Vol 3 (3) ◽  
pp. 287-295
Author(s):  
Joewono Prasetijo ◽  
Guohui Zhang ◽  
Muhammad Isradi ◽  
Zaffan Farhana Zainal ◽  
Wan Zahidah Musa ◽  
...  
Keyword(s):  
Integrated Design ◽  
Access Point ◽  
Road Accident ◽  
Speed Profile ◽  
Passenger Cars ◽  
Road Design ◽  
Consistency Model ◽  
Traffic Volumes ◽  
Design Consistency ◽  
The Impact

Purpose: Malaysia is one of the developing countries that facing high road accident in Asia. The most common accident happens is between motorcyclist and cars. A motorcyclist is 17 times more dangerous than passenger cars. Analysis shows the three main types of accidents in Malaysia is collision with passenger cars, collisions with other motorcycles and single-motorcycle accidents. Road accidents keep rising in Malaysia, because lacks of road geometric design consistency where the drivers make mistakes errors due to the road geometric features. Design/methodology/approach: The study was conducted at F0050 from km 21 until km 25. By using GPS (DG -200), the continuous speed profile data were using new analysis method to develop road design consistency profile of motorcycle and cars and determined the value of the index the integrated road design consistency (IC). Findings: The developments of consistency model are based on parameter: the bounded area between the profile and the average speed, standard deviation of speed along a segment. Hence, use ACAD software for develops consistency model’s profile. The integrated-consistency model is the impact of the speed profile on design consistency in traffic and safety evaluations. The highest areas of an accident at km 24 are justified based on the design consistency of the area and integrated design consistency model between of car and motorcycle is poor design. The study shows that crashes and fatalities are fully effected by traffic volumes but road design performances and driving behavior. Research limitations/implications: However, the traffic volumes are relatively low in the whole country regarding to the Movement Control Order (MCO) due to the pandemic COVID-19 since March 2020. In contrast to the reduction of the volumes, the number of crashes still shows relatively high. Therefore, it shows that crashes and fatalities are influenced by other factors. Geometric factors such as access point, tangent length, curve length, shoulder width, and lane width are influencing an operating speed profile for developed tangents and curves of motorcycle and cars. Practical implications: The result of this study can be used as references to solve accident problems in Malaysia. Paper type: This study is categorized as a case study.

scholarly journals COUNTERMEASURES TO IMPROVE ROAD ALIGNMENT CONSISTENCY OF UNDIVIDED RURAL ROADS

2017 ◽  
Vol 12 (4) ◽  
pp. 211-217 ◽  
Author(s):  
Francesca Russo ◽  
Salvatore Antonio Biancardo
Keyword(s):  
Evaluation Process ◽  
Weather Conditions ◽  
Operating Speed ◽  
Speed Profile ◽  
Negative Exponential Function ◽  
Crash Rates ◽  
Consistency Model ◽  
Global Consistency ◽  
Design Consistency ◽  
Circular Curves

The research aims to assess the relationships between the crash rates and road consistency. Design consistency assessment is a tool employed by designers to improve road safety. The case study involved a rural two-lane two-way road in Southern Italy located on a flat terrain without spiral transition curves between tangent segments and circular curves. Road alignment consistency was examined in two steps: by adopting standards in force in Italy based on the design speed profile and by plotting operating speed profile to determine the area bounded by the speed profile and the average weighted speed, and the standard deviation of operating speeds for each geometric segment. Operating speed prediction model, which returns the 85th percentile of the speed distribution of the only cars under free flow conditions, right weather conditions, and lighting was adopted. A negative exponential function was performed to predict the global consistency of a road as a whole. Finally, a model for predicting the crash rate was calibrated, confirming an increase of design consistency when the crash rates decrease significantly. The consistency model represents a useful tool during the geometric design process or the evaluation process for two-lane rural highways.

scholarly journals Crash model based on integrated design consistency with low traffic volumes (due to health disaster (COVID-19)/movement control order)

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Joewono Prasetijo ◽  
Guohui Zhang ◽  
Zulhaidi Mohd Jawi ◽  
Mohd Eizzuddin Mahyeddin ◽  
Zaffan Farhana Zainal ◽  
...  
Keyword(s):  
Integrated Design ◽  
Movement Control ◽  
Model Based ◽  
Traffic Volumes ◽  
Design Consistency ◽  
Control Order ◽  
Crash Model ◽  
Low Traffic

scholarly journals The Impact of Cold and Snow on Weekday and Weekend Highway Total and Passenger Cars Traffic Volumes

2014 ◽  
Vol 8 (1) ◽  
pp. 62-72 ◽  
Author(s):  
Hyuk-Jae Roh ◽  
Satish Sharma ◽  
Sandeep Datla
Keyword(s):  
Statistical Significance ◽  
Accurate Estimation ◽  
Passenger Cars ◽  
Passenger Car ◽  
Motion Data ◽  
Dummy Variable ◽  
Weigh In Motion ◽  
Traffic Volumes ◽  
Adjustment Factors ◽  
The Impact

Presented in this paper is an investigation of the impact of cold and snow on daily traffic volumes of total traffic and passenger cars. It is based on a detailed case study of five years of Weigh-In-Motion data recorded continuously at a highway site in Alberta, Canada. Dummy-variable regression models are used to relate daily traffic volumes with snowfall and categorized cold variables. The importance of all the independent variables used in the model are established by conducting tests of statistical significance. The total traffic and passenger car volumes are influenced by both the snowfall and the cold categories. Plots of the partial effect of each independent variable on the dependent variable are generated. It is found that a daily snowfall of 10 cm may cause a 25% reduction in the daily volume of passenger cars, and temperatures below -25°C may reduce the passenger car volumes by 10% or more. It is believed that the developed traffic-weather models of this study can benefit highway agencies in developing more advanced imputation method or identifying weather adjustment factors for accurate estimation of AADT from short duration traffic counts.

Time-Based Calibration of the Inertial Operating Speed to Enhance the Assessment of the Geometric Design Consistency

2018 ◽  
Vol 2672 (38) ◽  
pp. 223-232 ◽  
Author(s):  
David Llopis-Castelló ◽  
Francesco Bella ◽  
Francisco Javier Camacho-Torregrosa ◽  
Alfredo García
Keyword(s):  
Human Factors ◽  
Short Term Memory ◽  
Weighted Average ◽  
Geometric Design ◽  
Accurate Estimation ◽  
Operating Speed ◽  
Speed Profile ◽  
Consistency Model ◽  
Global Consistency ◽  
Design Consistency

Road crashes are mainly caused by three concurrent factors: infrastructure, vehicle, and human factors. The interaction between the infrastructure and human factors leads to the concept of geometric design consistency. Recently, a global consistency model was developed based on the difference between the inertial operating speed profile and the operating speed profile. The first was defined as the weighted average operating speed of the previous road section based on distance, and represents drivers’ expectancies, whereas the second represents road behavior. However, drivers’ expectancies are related to short-term memory which declines gradually and depends on time. Thus, a time-based inertial operating speed would allow a more accurate estimation of the phenomenon. This research analyzes different periods of time and weighting distributions to identify how drivers’ expectancies should be estimated. A set of 71 homogeneous road segments located in Italy were considered in the study. As a result, 25 seconds and a convex parabolic distribution should be used to calculate the inertial operating speed profile. This new way of estimating drivers’ expectancies showed better results than those obtained based on distance. Finally, the proposed consistency model was compared with the previous models and was found to be able to assess more accurately the geometric design consistency. Therefore, the proposed consistency model is a useful tool for engineers to estimate the number of crashes so that they can incorporate road safety considerations into the geometric design of either new two-lane rural roads, or improving the existing ones.

scholarly journals An efficient approach to reliability-based topology optimization for the structural lightweight design of planar continuum structures

2021 ◽  
Vol 37 ◽  
pp. 270-281
Author(s):  
Fangfang Yin ◽  
Kaifang Dang ◽  
Weimin Yang ◽  
Yumei Ding ◽  
Pengcheng Xie
Keyword(s):  
Topology Optimization ◽  
Lightweight Design ◽  
Integrated Design ◽  
Optimization Methods ◽  
Filter Function ◽  
Continuum Structures ◽  
Performance Indexes ◽  
Reliability Method ◽  
Economic Indexes ◽  
The Impact

Abstract In order to solve the application restrictions of deterministic-based topology optimization methods arising from the omission of uncertainty factors in practice, and to realize the calculation cost control of reliability-based topology optimization. In consideration of the current reliability-based topology optimization methods of continuum structures mainly based on performance indexes model with a power filter function. An efficient probabilistic reliability-based topology optimization model that regards mass and displacement as an objective function and constraint is established based on the first-order reliability method and a modified economic indexes model with a composite exponential filter function in this study. The topology optimization results obtained by different models are discussed in relation to optimal structure and convergence efficiency. Through numerical examples, it can be seen that the optimal layouts obtained by reliability-based models have an increased amount of material and more support structures, which reveals the necessity of considering uncertainty in lightweight design. In addition, the reliability-based modified model not only can obtain lighter optimal structures compared with traditional economic indexes models in most circumstances, but also has a significant advantage in convergence efficiency, with an average increase of 44.59% and 64.76% compared with the other two reliability-based models. Furthermore, the impact of the reliability index on the results is explored, which verifies the validity of the established model. This study provides a theoretical reference for lightweight or innovative feature-integrated design in engineering applications.

scholarly journals The Development of Strategies to Reduce Exhaust Emissions from Passenger Cars in Rzeszow City—Poland. A Preliminary Assessment of the Results Produced by the Increase of E-Fleet

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1046
Author(s):  
Maksymilian Mądziel ◽  
Tiziana Campisi ◽  
Artur Jaworski ◽  
Giovanni Tesoriere
Keyword(s):  
Particulate Matter ◽  
Electric Vehicles ◽  
Combustion Engine ◽  
Present Report ◽  
Exhaust Emissions ◽  
Motor Vehicles ◽  
Strategic Choices ◽  
Passenger Cars ◽  
Particulate Concentration ◽  
The Impact

Urban agglomerations close to road infrastructure are particularly exposed to harmful exhaust emissions from motor vehicles and this problem is exacerbated at road intersections. Roundabouts are one of the most popular intersection designs in recent years, making traffic flow smoother and safer, but especially at peak times they are subject to numerous stop-and-go operations by vehicles, which increase the dispersion of emissions with high particulate matter rates. The study focused on a specific area of the city of Rzeszow in Poland. This country is characterized by the current composition of vehicle fleets connected to combustion engine vehicles. The measurement of the concentration of particulate matter (PM2.5 and PM10) by means of a preliminary survey campaign in the vicinity of the intersection made it possible to assess the impact of vehicle traffic on the dispersion of pollutants in the air. The present report presents some strategies to be implemented in the examined area considering a comparison of current and project scenarios characterized both by a modification of the road geometry (through the introduction of a turbo roundabout) and the composition of the vehicular flow with the forthcoming diffusion of electric vehicles. The study presents an exemplified methodology for comparing scenarios aimed at optimizing strategic choices for the local administration and also shows the benefits of an increased electric fleet. By processing the data with specific tools and comparing the scenarios, it was found that a conversion of 25% of the motor vehicles to electric vehicles in the current fleet has reduced the concentration of PM10 by about 30% along the ring road, has led to a significant reduction in the length of particulate concentration of the motorway, and it has also led to a significant reduction in the length of the particulate concentration for the access roads to the intersection.

Mobility aware of WDM-based CMO OFDM communication system

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Saad M. Hardan ◽  
Ayad A. Abdulkafi ◽  
Saadi Hamad Thalij ◽  
Sherine S. Jumaah
Keyword(s):  
Wavelength Division Multiplexing ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Light Emitting Diode ◽  
Access Point ◽  
Mobile Users ◽  
Visible Light Communications ◽  
Optical Wireless Communications ◽  
High Data ◽  
The Impact

Abstract The continued increase in several mobile applications forces to replace existing limited spectrum indoor radio frequency wireless connections with high-speed ones. Visible light communications (VLC) technology has gained prominence in the development of high data rate transmission for fifth-generation networks. In optical wireless communications, light-emitting diode (LED) transmitters are used in applications that desire mobility as LED divergence enables larger coverage. Since each VLC access point covers a small area, handovers of mobile users are inevitable. Wavelength division multiplexing (WDM) can be used in VLC systems to tackle the above issue and to meet the increasing demand for indoor connectivity with high bit rates. In this paper, a new system architecture for WDM with coded modulated optical in orthogonal frequency division multiplexing (OFDM) VLC system in conjunction with red, green, blue, and yellow (RGBY) LEDs is proposed to reduce the impact of random receiver orientation of indoor mobile users over VLC downlink channels and improves the system’s bit-error-rate (BER) performance. Simulation results show that the proposed method is not affected by the user’s mobility and hence it performs better than other approaches, in terms of BER for all scenarios and at all positions. This study reveals that using WDM-OFDM-VLC with RGBY LEDs to construct a VLC system is very promising.

scholarly journals Attributes of turnaround rural hospitals: Case study findings and research opportunities

2017 ◽  
Vol 6 (6) ◽  
pp. 8
Author(s):  
Asa B. Wilson
Keyword(s):  
Theory Of The Firm ◽  
Access Point ◽  
Hospital Performance ◽  
Rural Hospitals ◽  
Rural Hospital ◽  
Classical Economics ◽  
The Status ◽  
History Of ◽  
Closure Conversion ◽  
The Impact

Background: Rural and Critical Access Hospitals (CAHs) have a history of operating challenges and closure-conversion threats. The history is reviewed including the supportive public policy provisions and administrative tactics designed to maintain a community’s hospital as the hub and access point for health services. Limited research indicates that rural facilities are not strategic in their responses to challenges. A question emerges regarding the enduring nature of operating difficulties for these facilities, i.e., no understanding with explanatory value.Objective: The author, as the CEO in six rural hospitals designated as turnaround facilities, used inductive participant-observer involvement to identify operating attributes characteristic of these organizations. An objective description of each facility is provided. While implementing a turnaround intervention, fifteen behaviors or outcomes were found to be consistent across all six entities. This information is used to posit factors associated with or accounting for identified performance weaknesses.Conclusions: It is conceptualization that observed organizational behaviors can be explained as remnants of an agrarian ideology. Such a mindset is focused on preserving the status quo despite challenges that would require strategic positioning of the organization. In addition, emerging studies on community types indicates that follow-up research is needed that assesses the impact of community attributes on rural hospital performance. Also, this study shows that a theory of the rural hospital firm based on neo-classical economics has no explanatory value. Thus, a theory of the firm can be developed that includes behavioral economic principles.

scholarly journals Design Integrated in the Mechanical Engineering Curriculum: Assessment of the Engineering Clinics

2007 ◽  
Vol 129 (7) ◽  
pp. 682-691 ◽  
Author(s):  
Jennifer Kadlowec ◽  
Krishnan Bhatia ◽  
Tirupathi R. Chandrupatla ◽  
John C. Chen ◽  
Eric Constans ◽  
...  
Keyword(s):  
Survey Data ◽  
Mechanical Engineering ◽  
Engineering Students ◽  
Integrated Design ◽  
Curriculum Assessment ◽  
Rowan University ◽  
Core Courses ◽  
Team Environment ◽  
Design Skills ◽  
The Impact

At Rowan University, design has been infused into the curriculum through an eight-semester course sequence called the Engineering Clinics. Through this experience, students learn the art and science of design in a multidisciplinary team environment and hone their design skills throughout their 4-year career. This paper describes the objectives of the clinics, types of projects, and how the clinics complement traditional core courses in the curriculum. Impacts and benefits of the clinics on students and faculty are discussed, including retention and graduate study rates comparing Rowan University mechanical engineering students to their peers nationally. An assessment of the clinics is presented based on survey data and accreditation objectives and outcomes. Survey data from students were assessed to determine levels of students’ satisfaction and confidence based on the clinics. Results of alumni and employer surveys also provide valuable feedback for assessing and improving the clinics as well as confirmation of the impact of clinics after graduation. Survey data are discussed along with challenges of the clinics at Rowan and adaptability of them at other institutions. Overall, the clinics are a positive and integrated design experience in the curriculum and assist students in achieving the program objectives.

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