No description available.

Thesis (M.S.)--Brigham Young University. Dept. of Civil and Environmental Engineering, 2007. / Includes bibliographical references (p. 99-100).

No description available.

Indiana University-Purdue University Indianapolis (IUPUI) / Road accident reconstruction and simulation investigates the accident causes, suggests improvements in vehicle design and investigates failures in vehicle control and safety systems such as the anti-lock brake system (ABS) and air-bag deployment. This thesis focuses on analysis of crash data from vehicles not equipped with collision warning systems. Vehicle parameters before and during an accident can be recorded using an Event Data Recorder (EDR) which helps in reconstructing an accident. This tool, installed in the vehicle, records different crash parameters like vehicle speed, lateral and longitudinal acceleration, seat-belt status, and air-bag deployment over a period that spens the accident. This thesis focuses on accident reconstruction with and without EDR data. A simulation software tool called HVE is used to visually recreate the reconstructed accidents. HVE is a platform to execute different accident simulation methods which are used for specific types of simulations. Two such simulation methods, EDSMAC4 and EDHIS, are discussed in this thesis. The former is an important method for vehicle-to-vehicle collisions and the latter is used for analysis of human behavior involved in the accident. Three real-life accidents were chosen for reconstruction and simulation. They were Bus and Car accident, Three Vehicle accident and Intersection accident. These particular accidents were chosen to represent a diverse selection of accidents based on the following parameters: the locations of the accidents, the vehicles involved in each accident, and the data available. A qualitative analysis of vehicle occupant's behavior is also presented for one of the three accidents. The thesis discusses in detail the reconstruction of these three accidents. Throughout these simulations, the thesis illustrates the advantages and limitations of the EDR and HVE simulation software for accident reconstruction and simulation.

Thesis (MScEng)--University of Stellenbosch, 2004. / ENGLISH ABSTRACT: South Africa, and other developing countries, experience great problems concerning road traffic accidents. Despite road safety campaigns like Arrive Alive being launched, accident rates do not decline significantly and the problem is predicted to get worse. This study is done on a road in the Western Cape, the R44, to investigate the causes of road accidents. The causes of the accidents are deduced from the accident reports and relationships are sought with other factors. The results of this study are risk factors (human-, environment- and vehicle factors) for the 14 accident types that occurred on the R44, as well as measures to prevent road accidents. It has been found that the human factor plays the biggest role in road accidents. Out of the 404 accidents analysed, 77.7% were caused by human factors, 8.7% by unknown factors, 7.2% by environmental factors and 6.4% by vehicle factors. The problems experienced with the data quality are reported and recommendations concerning it are made. / AFRIKAANSE OPSOMMING: Suid-Afrika en ander ontwikkelende lande ervaar groot probleme met verkeersongelukke. Ten spyte van veldtogte soos Arrive Alive wat geloods word, neem ongelukskoerse nie beduidend af nie, en daar word voorspel dat die situasie nie gaan verbeter nie. Hierdie studie is op 'n pad in die Wes-Kaap, die R44, gedoen om die oorsake van padongelukke vas te stel. Die oorsake van ongelukke i s van die ongeluksvorms a fgelei, en verwantskappe is gesoek met ander faktore. Die resultate van die studie is risikofaktore (menslike-, omgewings- en voertuigfaktore) vir die 14 ongelukstipes wat op die R44 voorgekom het, asook voorkomingsmaatreëls om padongelukke te voorkom. Daar is gevind dat die menslike faktor die grootste oorsaak van ongelukke is. Uit die 404 ongelukke wat geanaliseer is, is 77.7% van die ongelukke deur menslike faktore, 8.7% van die ongelukke deur onbekende faktore, 7.2% van die ongelukke deur omgewingsfaktore en 6.4% van die ongelukke deur voertuigfaktore veroorsaak. In hierdie studie is probleme ondervind met die datakwaliteit, en daaroor is verslag gedoen en aanbevelings gemaak.

D. Tech. Policing / The first legislation on accident reporting in South Africa was promulgated in 1913 in an ordinance of Transvaal, one of the four provinces of South Africa at the time. Since then several amendments have been made to legislation on accident reporting, but accident reporting has continued to be time consuming and unnecessarily complicated. It seems that technology is not yet utilised to its full potential. Therefore this study investigates ways in which an online application (app) for accident reporting could be designed and implemented. The development and implementation of a simpler and modern app for online accident reporting could successfully address the problem of unavailable statistics for minor damage-only accidents. By amending the National Road Traffic Act, 1996 (Act 93 of 1996) to accommodate more cost-effective online accident reporting through eAccident, the time spent on compiling the current accident reports could be minimised and costly human resources could be utilised more effectively in core police functions such as law enforcement.

Thesis (MTech. degree in Traffic Safety Management)--Tshwane University of Technology, 2008. / This research explored ways in which the process of road traffic accident reporting in the Johannesburg metropole could be enhanced. The specific objectives were to systematically examine the process of road traffic accident reporting and to focus on an analysis of (1) the time it takes the relevant authorities to complete the various activities involved in reporting road traffic accidents; (2) the quality of completed road traffic accident reports; and (3) the general experiences of drivers involved in road traffic accidents regarding the system of road traffic accident reporting and information retrieval in the Johannesburg metropole; to draft guidelines for strengthening the process of road traffic accident reporting in the research area, based on the mentioned analysis; and to provide pointers for future research. The study adopted a systems perspective on road traffic accident reporting and took cognisance of the wider road traffic safety management and transportation context in South Africa. The findings underlined that (1) the time taken to report road traffic accidents in the Johannesburg metropole tended to be unacceptably long; and that (2) accident reports tended to be inaccurate and/or incomplete. Based on the findings and the conceptual premises of the study, the researcher developed an accident-reporting management model.

Disagreements regarding to what degree right-turn lanes improve or worsen the safety of intersections and driveways provided the motivation and the need for this study. The objectives of this study were to: a) carry out an in-depth study to determine the safety impacts of right-turn movements in different contexts, and b) develop safety-based volume warrants for right-turn lanes if safety indeed improves. Lack of adequate study on the applicability of past warrants and guidelines for the specific context of right-turn movements made from major uncontrolled approaches at unsignalized intersections, and particularly driveways, on two-lane roadways provided the scope for this study. Five-year historical data of statewide traffic crashes reported on Minnesota’s twolane trunk highways were analyzed using binary/multinomial logistic regressions. Conflicts due to right turns were analyzed by fitting least squares conflict prediction models based on the data obtained from field surveys and traffic simulations. The safety impacts of rightturn lanes were determined through crash-conflict relationships, crash injury severity, and crash and construction costs. The study found that the probabilities of right-turn movement related crash ranged from 1.6 to 17.2% at intersections and from 7.8 to 38.7% at driveways. Rear-end, samedirection- sideswipe, right-angle and right-turn crash types constituted 96% of right-turn movement related crashes. Rear-end crash probabilities varied from 13.7 to 46.4% at approaches with right-turn lanes and from 37.9 to 76.9% otherwise. The ratios of rearend/ same-direction-sideswipe crashes to conflicts were 0.759 x 10^6 at approaches with right-turn lanes and 1.547 x 10^6 otherwise. Overall, right-turn lanes reduced right-turn movement related crash occurrences and conflicts by 85% and 80%, respectively. Right-turn lanes also reduced crash injury severity, hence, reducing the economic cost by 26%. Safety benefits, in dollars, realized with the use of right-turn lanes at driveways were 29% and 7% higher compared to those at intersections at low and high speed conditions respectively for similar traffic conditions. Depending on roadway conditions, interest rate and construction costs, the safety-based volume thresholds ranged from 3 to 200 right turns per hour during the design hour at intersection approaches, and from 2 to 175 right turns at driveway approaches.

The requirement to operate vehicles in low light and/or night environments whilst wearing night vision goggle (NVG) systems has become increasingly common during military operations. There is very limited research investigating injury risks associated with these systems during ground vehicle collisions. This study examined the injury risks associated with wearing the Australian Defence Force - Enhanced Combat Helmet (ECH) and NVG system, in frontal vehicle collisions. This project consisted of two components: (1) crash tests using a sled and (2) numerical simulations of impacts. Four dynamic sled tests were conducted using a 50th percentile, male, Hybrid III dummy positioned on a rigid seat. Frontal impact tests were performed at a 40 km/h change in velocity (*v) and 20 g deceleration. The test configurations were as follows: (a) Base; (no helmet or additional equipment); (b) ECH; and, (c) ECH and NVG. Condition (c) was carried out twice, to determine repeatability. The sled test protocols were reconstructed precisely with the numerical simulation package MADYMO and the simulations were shown to correlate well with the experimental results. Using this validated model, four parametric studies were undertaken to assess the influence of counterweights, seat cushion, seatbelt pre-tensioner, and the vehicle's *v and acceleration on injury risks. The study found that neck loads were within acceptable limits, with the exception of the neck extension moment, which was exceeded for all NVG conditions. Based on the parametric studies, no major improvements were observed in the neck extension moments with the use of counterweights or a seat cushion. In contrast the use of a seatbelt pre-tensioner was observed to decrease greatly this neck injury risk in certain scenarios. The study also identified that a *v of 15 km/h and peak acceleration of up to 14 g were required to keep the neck extension moment below the prescribed injury criteria. However, the high neck extension moment values may have been partially attributable to the stiff Hybrid III neck. This study identified a possible injury mechanism for soldiers using the ECH and NVG system during specific impact scenarios. The method applied in this project was designed to be repeatable.

The requirement to operate vehicles in low light and/or night environments whilst wearing night vision goggle (NVG) systems has become increasingly common during military operations. There is very limited research investigating injury risks associated with these systems during ground vehicle collisions. This study examined the injury risks associated with wearing the Australian Defence Force - Enhanced Combat Helmet (ECH) and NVG system, in frontal vehicle collisions. This project consisted of two components: (1) crash tests using a sled and (2) numerical simulations of impacts. Four dynamic sled tests were conducted using a 50th percentile, male, Hybrid III dummy positioned on a rigid seat. Frontal impact tests were performed at a 40 km/h change in velocity (*v) and 20 g deceleration. The test configurations were as follows: (a) Base; (no helmet or additional equipment); (b) ECH; and, (c) ECH and NVG. Condition (c) was carried out twice, to determine repeatability. The sled test protocols were reconstructed precisely with the numerical simulation package MADYMO and the simulations were shown to correlate well with the experimental results. Using this validated model, four parametric studies were undertaken to assess the influence of counterweights, seat cushion, seatbelt pre-tensioner, and the vehicle's *v and acceleration on injury risks. The study found that neck loads were within acceptable limits, with the exception of the neck extension moment, which was exceeded for all NVG conditions. Based on the parametric studies, no major improvements were observed in the neck extension moments with the use of counterweights or a seat cushion. In contrast the use of a seatbelt pre-tensioner was observed to decrease greatly this neck injury risk in certain scenarios. The study also identified that a *v of 15 km/h and peak acceleration of up to 14 g were required to keep the neck extension moment below the prescribed injury criteria. However, the high neck extension moment values may have been partially attributable to the stiff Hybrid III neck. This study identified a possible injury mechanism for soldiers using the ECH and NVG system during specific impact scenarios. The method applied in this project was designed to be repeatable.