scholarly journals Assessment of the Effectiveness of Different Safety Measures at Tunnel Lay-Bys and Portals to Protect Occupants in Passenger Cars

2021 ◽  
Vol 6 (6) ◽  
pp. 81
Author(s):  
Ernst Tomasch ◽  
Simon Franz Heindl ◽  
Gregor Gstrein ◽  
Wolfgang Sinz ◽  
Hermann Steffan
Keyword(s):  
Injury Risk ◽  
Severity Index ◽  
Assessment Criteria ◽  
Passenger Compartment ◽  
Passenger Cars ◽  
Protection Measure ◽  
Safety Measures ◽  
Road Users ◽  
Data Acquisition Unit ◽  
Concrete Barrier

Tunnel portals and tunnel lay-bys are hazardous spots for road users. Different infrastructure safety measures are in use, but the protection level is not known. In this study the following safety measures for reducing the injury risk are investigated: angular positioned 4 m and 8 m concrete barrier, crash cushion Alpina F1-50 and Alpina <prototype> crash cushion. A passenger car equipped with a data acquisition unit is accelerated to 100 km/h and impacts the safety measure. The assessment of the latter is based on the EN 1317 criteria, specifically the Acceleration Severity Index (ASI), Theoretical Head Impact Velocity (THIV). Further assessment criteria are related to intrusions into the passenger compartment and post-crash motion. The best result in terms of ASI and THIV was achieved by the 8 m (ASI: 1.6, THIV: 30 km/h) concrete barrier. The crash cushion Alpina <prototype> showed good results for the ASI (1.8) but the THIV (57 km/h) was less satisfactory, while the angular positioned 4 m concrete barrier (ASI: 2.9, THIV: 53 km/h) and the crash cushion Alpina F1-50 (ASI: 3.3, THIV: 74 km/h) performed worst. Even though some of the measures showed good results, no protection measure tested currently complies with all the assessment criteria used.

scholarly journals Contrasting Perspectives on the Comfort and Safety of Pedestrians Interacting with Other Road Users

2021 ◽  
Vol 2675 (3) ◽  
pp. 33-43
Author(s):  
Alexander Bigazzi ◽  
Gurdiljot Gill ◽  
Meghan Winters
Keyword(s):  
Traffic Safety ◽  
Injury Risk ◽  
Road User ◽  
Motor Vehicles ◽  
Advisory Group ◽  
User Interactions ◽  
The Public ◽  
Road Users ◽  
Expert Assessments ◽  
Sample Representation

Assessments of interactions between road users are crucial to understanding comfort and safety. However, observers may vary in their perceptions and ratings of road user interactions. The objective of this paper is to examine how perceptions of yielding, comfort, and safety for pedestrian interactions vary among observers, ranging from members of the public to road safety experts. Video clips of pedestrian interactions with motor vehicles and bicycles were collected from 11 crosswalks and shown to three groups of participants (traffic safety experts, an engaged citizen advisory group, and members of the general public) along with questions about yielding, comfort, and risk of injury. Experts had similar views of yielding and comfort to the other two groups, but a consistently lower assessment of injury risk for pedestrians in the study. Respondent socio-demographics did not relate to perceptions of yielding, comfort, or risk, but self-reported travel habits did. Respondents who reported walking more frequently rated pedestrian comfort as lower, and respondents who reported cycling more frequently rated risk as lower for pedestrian interactions with both motor vehicles and bicycles. Findings suggest small groups of engaged citizens can provide useful information about public perspectives on safety that likely diverge from expert assessments of risk, and that sample representation should be assessed in relation to travel habits rather than socio-demographics.

scholarly journals Impact of Operating Time on Selected Tribological Properties of the Friction Material in the Brake Pads of Passenger Cars

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 884
Author(s):  
Andrzej Borawski
Keyword(s):  
Tribological Properties ◽  
Operating Time ◽  
Friction Material ◽  
Operating Conditions ◽  
Direct Impact ◽  
Passenger Cars ◽  
Wear Factor ◽  
Brake Pads ◽  
Road Users ◽  
The Coefficient Of Friction

Braking systems have a direct impact on the safety of road users. That is why it is crucial that the performance of brakes be dependable and faultless. Unfortunately, the operating conditions of brakes during their operating time are affected by many variables, which results in changes in their tribological properties. This article presents an attempt to develop a methodology for studying how the operating time affects the value of the coefficient of friction and the abrasive wear factor. The Taguchi method of process optimization was used to plan the experiment, which was based on tests using the ball-cratering method. The results clearly show that the degree of wear affects the properties of the friction material used in the production process of brakes.

Multimodal injury risk analysis of road users at signalized and non-signalized intersections

2014 ◽  
Vol 71 ◽  
pp. 201-209 ◽  
Author(s):  
Jillian Strauss ◽  
Luis F. Miranda-Moreno ◽  
Patrick Morency
Keyword(s):  
Risk Analysis ◽  
Injury Risk ◽  
Signalized Intersections ◽  
Road Users

Roof Strength and Injury Risk in Rollover Crashes of Passenger Cars

2009 ◽  
Vol 10 (6) ◽  
pp. 584-592 ◽  
Author(s):  
Matthew L. Brumbelow ◽  
Eric R. Teoh
Keyword(s):  
Injury Risk ◽  
Passenger Cars ◽  
Roof Strength

scholarly journals Impact test comparisons of 20th and 21st century American football helmets

2012 ◽  
Vol 116 (1) ◽  
pp. 222-233 ◽  
Author(s):  
Adam Bartsch ◽  
Edward Benzel ◽  
Vincent Miele ◽  
Vikas Prakash
Keyword(s):  
Head Injury ◽  
21St Century ◽  
Injury Risk ◽  
Diffuse Axonal Injury ◽  
Angular Acceleration ◽  
Linear Acceleration ◽  
Severity Index ◽  
Head Impact ◽  
American Football ◽  
Acute Subdural Hematoma

Object Concussion is the signature American football injury of the 21st century. Modern varsity helmets, as compared with vintage leather helmets, or “leatherheads,” are widely believed to universally improve protection by reducing head impact doses and head injury risk for the 3 million young football players in the US. The object of this study was to compare the head impact doses and injury risks with 11 widely used 21st century varsity helmets and 2 early 20th century leatherheads and to hypothesize what the results might mean for children wearing similar varsity helmets. Methods In an injury biomechanics laboratory, the authors conducted front, oblique front, lateral, oblique rear, and rear head impact tests at 5.0 m/second using helmeted headforms, inducing near- and subconcussive head impact doses on par with approximately the 95th percentile of on-field collision severity. They also calculated impact dose injury risk parameters common to laboratory and on-field traumatic neuromechanics: linear acceleration, angular acceleration, angular velocity, Gadd Severity Index, diffuse axonal injury, acute subdural hematoma, and brain contusion. Results In many instances the head impact doses and head injury risks while wearing vintage leatherheads were comparable to or better than those while wearing several widely used 21st century varsity helmets. Conclusions The authors do not advocate reverting to leather headgear, but they do strongly recommend, especially for young players, instituting helmet safety designs and testing standards, which encourage the minimization of linear and angular impact doses and injury risks in near- and subconcussive head impacts.

scholarly journals DESIGN, SIMULATION AND MATHEMATICAL MODELLING OF THE DYNAMIC BEHAVIOR OF A VEHICLE TIRE AND CHASSIS SYSTEM AT A TURN.

2020 ◽  
Vol 7 (1) ◽  
pp. 12-23
Author(s):  
Mbelle Samuel Bisong ◽  
Paune Felix ◽  
Lokoue D. Romaric Brandon ◽  
Pierre Kisito Talla
Keyword(s):  
Road Construction ◽  
Maximum Speed ◽  
Safety Measures ◽  
The Road ◽  
Road Users ◽  
Road Section ◽  
Lateral Behavior ◽  
Road Characteristics ◽  
Fundamental Theorems ◽  
The Given

Road security has become with time a topic of concern in our society as per the increasing number of accidents and deaths occurring on the highways. Regulatory experts on road users have constantly been working for ways to solve this problem and thence better the lives of the citizens. This paper is aimed at proposing a mathematical model integrating specific parameters, describing the dynamic lateral behavior of a vehicle’s tire and chassis systems and enabling to state a relationship between road characteristics and vehicle dynamics. To achieve this, we made used of the fundamental theorems of dynamics for the modeling of the vehicle’s suspended and non-suspended masses and load transfers, then we associated this with the Pacejka Tire model to obtain a complete vehicle model. After the particularization of a global model, a simulator was realized named “DYNAUTO SIMULATOR” which iterates the given variables to produce a consistent result. After an experimental research made on the Ndokoti – PK 24 road section we could, thanks to our simulator determine the maximum speed to have at every turn of this road section and also understand the effect of the modification of a vehicle’s center of gravity on its stability. This work will be an important tool which can be recommended to the regulatory board as a major asset in the road construction policy and also in the improvement of road safety measures.

scholarly journals Willingness-To-Pay for Estimation the Risk Pedestrian Group Accident Cost

2020 ◽  
Vol 6 (6) ◽  
pp. 1064-1073 ◽  
Author(s):  
Chompoonut Puttawong ◽  
Preeda Chaturabong
Keyword(s):  
Willingness To Pay ◽  
Injury Risk ◽  
Road Accident ◽  
Road Accidents ◽  
The Road ◽  
Statistical Life ◽  
Perception Of Safety ◽  
Road Users ◽  
Pedestrian Injury ◽  
The Cost

The proven willingness-to-pay with contingent valuation (WTP-CV) method is an effective tool for evaluating the cost of road accidents in many countries. In Thailand, the most fatalities on Thailand’s roads involve the vulnerable road users (VRUs) including motorcycle users, bicyclists, and pedestrians. With the effectiveness of using WTP-CV in analyzing the accident cost of motorcycle users and lack of specific accident cost for pedestrians, this research focuses on evaluating the accident cost on the pedestrians which is the second most VRU fatality. In this research, the road accident cost of pedestrians aged 15-39 years in Bangkok by WTP-CV method was determined. The WTP-CV questionnaire was employed as a tool to measure the payment of which each pedestrian is willing to pay to reduce the fatality and injury risk from road accidents. One thousand and two hundred pedestrians in Bangkok were interviewed. With the results, the value of statistical life (VOSL) for pedestrians in Bangkok is valued at US$ 0.43 million, while the value of statistical injury (VOSI) is estimated at about US$ 0.014 million, respectively. In addition, it is found from the regression analysis that for the fatality risk reduction, higher educational levels and private business pedestrians are likely to pay more to save their lives. In order to reduce the risk of injury, respondents, who are single in marriage status, are likely to pay more to reduce the risk of pedestrian injury. However, a high perception of safety is less likely to pay for the reduction of injury risk.

An Integrated Modeling Method to Evaluate Fleet Safety Performance of New Vehicle Designs

2013 ◽  
Author(s):  
Randa Radwan Samaha ◽  
Priyaranjan Prasad ◽  
Dhafer Marzougui ◽  
Chongzhen Cui ◽  
Cing-Dao (Steve) Kan ◽  
...  
Keyword(s):  
Finite Element ◽  
Real World ◽  
Injury Risk ◽  
Three Dimensional ◽  
Structural Models ◽  
Passenger Compartment ◽  
Different Types ◽  
Structural Deformations ◽  
Scale Test ◽  
Frontal Crashes

A methodology for Evaluating Fleet, i.e., self and partner, Protection (EFP) of new vehicle designs is developed through a systems modeling approach driven by structural and occupant modeling and real world crash and full scale test data. The EFP methodology consists of a virtual model simulating the real world crash environment (i.e., different types of vehicles, impact velocities, impact directions, impact types, etc.). A concept or new vehicle design could be introduced into this model to evaluate the safety of its occupants and those of other vehicles with which it is involved in crashes. The initial implementation of EFP methodology is to frontal crashes where the modeled crash configurations are derived from a new crash taxonomy based on real world structural engagement. Simulation data to drive the methodology is obtained from finite element structural models of the vehicles. Occupant responses are based on three dimensional articulated rigid body models of the occupant and the passenger compartment. The occupant is restrained by seat belts and airbags and the structural deformations and kinematics of the passenger compartment needed to drive the occupant models are predicted by the finite element structural models. Both the structural and the occupant models are subjected to validation and robustness checks for the modeled crash configurations. The aggregate of injury risk across vehicle classes, impact speeds, occupant sizes, and crash configurations, weighted by relative frequency of the specific event in real world crashes, is used as a measure of overall societal safety. Results from a proof-of-concept application are presented.

Impacts of socio economic factors on perceptions of being safe while using Kuwaiti roads

2016 ◽  
Vol 13 (1) ◽  
pp. 56-64
Author(s):  
Hana AlSaeid ◽  
Talal Almutairi ◽  
Hamad Matar ◽  
Faraj F. Al-Ajmi ◽  
Fawaz A. Alrashidi ◽  
...  
Keyword(s):  
Design Methodology ◽  
Relevant Literature ◽  
Time Constraints ◽  
Economic Factors ◽  
Work Commitment ◽  
Safety Measures ◽  
Content Type ◽  
Road Users ◽  
Economic Attitudes ◽  
Socio Economic Factors

Purpose – The purpose of this paper is to investigate road users attitudes and preferences towards accidents and safety measures in Kuwait. The paper also quantifies impacts of user’s attitudes on the perception of being safe while using roads in Kuwait. Design/methodology/approach – In this paper, a review of relevant literature, has been carried out, then a questionnaire has been piloted and implemented to collect data. The main survey was carried out in 2013. A total of 700 distributed questionnaires resulted in the return of 427 completed questionnaires. Findings – Results show that socio economic, attitudes and work commitment factors, all contribute to the behaviour and attitudes of road users in Kuwait. Research limitations/implications – Data are limited due to time constraints. Originality/value – There is very little knowledge of modelling and analysing factors which affect drivers’ behaviour towards safety in Kuwait.

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