Research Article | Open Access
Joseph Kurebwa, Tawanda Mushiri, "A Study of Damage Patterns on Passenger Cars Involved in Road Traffic Accidents", Journal of Robotics, vol. 2019, Article ID 3927935, 12 pages, 2019. https://doi.org/10.1155/2019/3927935
A Study of Damage Patterns on Passenger Cars Involved in Road Traffic Accidents
Health emergencies occur in passenger cars where victims do not have immediate access to either layperson or professional, proper medical services, resulting in deterioration of their health or death. Installation of robotic first aid system for passenger-car occupants has been proposed. This study is part of a larger work of designing the system and seeks to identify the safest location inside the vehicle for it to survive any form of impact in a crash and retain the ability to assist the victims. The study population comprised 70 passenger cars (14 automakers across 7 segments) involved in road traffic accidents, which had been recovered by a roadside vehicle assistance company based in Harare, Zimbabwe, and were on the company’s premises on September , 2017. Vehicle damage was rated considering direction of force in comparison to a clock-point diagram, area damaged, and the damage severity on a scale of 1 to 7, following an official vehicle damage guide for traffic crash investigators. Data were analysed in Microsoft Office Excel 2016. In cases where vehicles were damaged in more than one area, all areas were recorded, hence 95 points of impact were analysed. Damage direct to the front denoted by 12 on the clock-point was the most common at 26%. This was compatible with the rate of frontal damage on vehicles, which was the highest at 51%, followed by the right and left sides that had 22% and 19%, respectively, the rear at 6%, and lastly the top (due to 2 recorded rollovers) at 2%. 56% of the damaged areas had a severity rating of either 5, 6, or 7. By eliminating all areas which had received damage in the study population, the robotic first aid system’s best chances of car crash survival are at the middle, towards the floor of the vehicle. It is advisable that the system does not depend on components in the proximity of the vehicle’s body as they are prone to damage in crashes. There is need for further research into the magnitude of impact that could reach the middle of different vehicles to define the strength of the robotic first aid system.
Worldwide, road traffic accidents (RTAs) kill 3,000 people every day and injure over 3 million every year . However, the odds are getting better with the advent of autonomous driving. The consensus in the automotive industry is that autonomous vehicles (AVs) are the way to go for safer transportation, among other reasons . In comparison to the myriad of faults human drivers exhibit while being behind the wheel, a computer is the ideal motorist [3, 4]. Likewise, robots show strong potential to transcend the limitations of human healthcare in surgical procedures [5, 6]. Similar to AV technology, robotic surgery is marred with scientific, legislative, and socioeconomic challenges [7–19], but it is evident that the idea of robotics and artificial intelligence (AI) envisaged in the concepts seems to be in the right direction for public health.
Vehicle safety is considered one of the key selling points by most automotive brands and car buyers alike [20, 21]. As such, a lot of effort is being put into the research and development of vehicle safety features by automakers, governments, and other players concerned within road transport safety. However, fatalities and injuries due to road traffic accidents continue to soar in some regions of the world, especially low- and middle-income countries, and road traffic injuries are a leading cause of preventable death [1, 22–24]. In addition to road traffic injuries, passengers may also suffer nontraumatic medical emergencies including cardiovascular and respiratory complications [25–27]. Human intervention in the form of first aid given to victims of RTAs is known to preserve life, prevent further harm, and promote recovery in most cases [28–31]. Of course, it works only when given properly, and the sad truth is that there are high chances of victims not getting proper help for reasons including absence of bystanders, responders fearful of legal action should they make mistakes, and entrapment of victims in the wreckage, thus being inaccessible [29, 32–38]. Getting help and getting it fast is the key to surviving a major-medical emergency, such as a trauma with serious injury, a stroke, or a heart attack. It is against this background that the researchers are convinced that an on-board robotic first aid (RFA) system in all passenger cars is an avenue worth exploring.
Robotic first aid is still in its infancy in terms of development and implementation, and so far there is no such research exclusive to passenger-car on-board systems. However, the few researches carried out so far envision faster and better quality first aid through human-robot integration [41–44]. Axiomatically, the RFA will ipso facto only work given that it survives the RTA without any damage. It is necessary, therefore, to study damage patterns on vehicles involved in RTAs to identify the safest location of the RFA system in the vehicle. To explore the design of a robotic first aid system for passenger-car occupants, a survey instrument was developed to gain deeper insight into key questions including the following:(1)Which parts of the vehicle are most prone to damage in RTAs?(2)What auxiliary units (that could possibly assist the RFA system in operation) are prone to damage in RTAs?(3)Where should the RFA system be placed for minimal disturbance in RTAs?(4)Are there any disparities in damage patterns in relation to the vehicle’s physical characteristics?
Answer to these questions and more will provide a foundation of specifications for the RFA system.
(i)Damage patterns refer to the distribution of physical harm that impairs the value, usefulness, or normal function of a motor vehicle.(ii)A passenger car is a road motor vehicle, other than a motor cycle, intended for the carriage of passengers and designed to seat no more than nine persons (including the driver) (Eurostat, ECMT and UNECE, 2002; Collins English Dictionary, 2017).(iii)A road traffic accident (RTA), also called a motor vehicle collision (MVC) among other terms, is the occurrence where a vehicle collides with another vehicle, pedestrian, animal, road debris, or other stationary obstruction, such as a tree, pole, or building.
1.3. Literature Review
1.3.1. Types of Crashes
A study was carried out on the R44 road in Western Cape, South Africa, to investigate the causes of road accidents . The results were obtained from 404 accident reports which had occurred along a 25 km stretch of the road from 1999 to 2003. 14 accident types, shown in Figure 1, were observed. The most frequent RTAs were primarily front- and rear-end impacts, followed by sideswipes.
These findings resonate with those in another study, which presented descriptive statistics about RTAs, including the types of vehicles involved in crashes and the damage to the vehicles . More than 94 percent of the 11 million vehicles involved in motor vehicle crashes in 2005 were passenger cars or light trucks. Regardless of crash severity, most vehicles in single- and two-vehicle crashes were going straight prior to the crash. The next most common vehicle manoeuvre differed by crash severity: negotiating a curve for fatal crashes, turning left for injury crashes, and stopped in traffic lane for property-damage-only crashes. Frontal collisions were the most common, followed by side and rear impacts. The findings of the data analysis regarding damage severity and points of impact are summarised in Figure 2.
1.3.2. Vehicle Characteristics as a Factor of Damage
A study was conducted to determine the patterns of use, collision types, and injury outcomes, comparing large and small cars in real world crashes . It categorised impact direction in RTAs as front, side, rear, and rollover judging from the principal direction of force and the surface contacted. The distribution of direction is shown in Figure 3 for small and large cars. It was observed that small cars were involved in similar rates of frontal and side impacts. However, 12% of small cars were involved in rear impacts compared to 4% of large cars. One factor that may have influenced this outcome is that small European cars are frequently of the hatchback type (A or B segment), meaning that there is a reduced crush space available before the car becomes immobilised.
The patterns in the study are reiterated by a survey of vehicles involved in RTAs which was conducted to examine the types and extent of vehicle damage sustained in front and rear collisions . Since the data were obtained from motor vehicle insurance companies, vehicle damage was reported in terms of insurance claims. The mean damage claims were higher for small cars ($949) than for sport utility vehicles (SUVs) ($925) or minivans ($877). From this, it can be concluded that small cars sustain more severe damage in RTAs than SUVs and minivans, which are larger in size.
1.3.3. Power Problems to Autonomous Vehicles
While all these efforts are being carried out, it is also necessary to note the power usage by the car. The model obtained  is being exploited as a component of complex control systems able to manage the energy flows between fuel cell stack, battery pack, auxiliary systems, and electric engine in a zero-emission vehicle prototype. One cell cannot power an engine and it is important that a well-organised manner is devised to connect the cells so that powering is done. This is generally called a hybrid battery system and the battery works to its maximum power; hence, this will be useful if done in this research paper. In particular, for nonlinear modeling purposes as what is noticed also in this vehicle study and damage patterns, a multilayer perceptron has been adopted . The model obtained does not rely on a single cell modeling, instead providing a macro-model of the whole stack. The resulting dynamic model relies on inputs which are easily measurable quantities, like reactant pressures and stack temperature. Data is trained in Artificial Neural Networks (ANN) and this will help for data storage and ease of use for the vehicle. Power is of huge concern in this research and this method is very useful.
1.3.4. Driving Assistance Using Smart Devices
For drivers’ safety, it is very important to use smart devices for assistance in case they lose concentration or a general problem occurs to the car or the driver . Two algorithms which can be easily implemented in a smart device and make use of standard on-board sensors, such as the camera and the accelerometer, were described. The first exploits the high performance in image processing of Cellular Nonlinear Networks to detect the occurrence of blinking eyes during driving, which can be associated with a state of fatigue of the driver. The second algorithm addresses the problem of brusque braking in order to enhance the capabilities of existing braking assistance devices . The obtained experimental results assess the capabilities of the proposed algorithms and their effectiveness in increasing driver safety at a low cost. This will be a useful way to reduce accidents in this time of industry 4.0 and its applications.
2. Materials and Methods
2.1. Study Setting
The study took place at the premises of a roadside vehicle assistance company based in Harare, capital of Zimbabwe. The site was chosen for the variety of vehicle brands, damaged areas, and severity of the damage, which give a wide spectrum of effects a random RTA could have on the RFA system.
2.2. Study Population
The study population comprised 70 passenger cars involved in RTAs, which had been recovered by roadside vehicle assistance company, and were on the company’s premises on September , 2017.
2.3. Data Collection
All the required data was collected by the researchers on the same day from 1050 hrs to 1315 hrs CAT, by filling out forms that required entries for the vehicle make, model, year of manufacture, and segment. More importantly, there were columns for the damage rating as illustrated in Table 1. The rating scales for all the components describing the damage were guided by the system developed by the Texas Department of Transportation in accordance with the American National Standards Institution (ANSI) D16.1 standard. The guide was selected because it was readily available online and it was observed to be adequate in assisting the researchers to correctly and accurately assess the damage sustained by passenger cars in RTAs. Raw data collected are shown in Appendix A.
(i) XX described the direction from which the vehicle damage was received resembling numbers on a clock (1–12). It was shown with a 1– or 2–digit numeric character,
(ii) ABC described the area of the vehicle that received damage, reported with a 2 or 3 alpha character code.
(iii) Y described the severity of the damage received and was reported with a single–digit numeric character between 0 and 7.
2.3.1. Determining the Direction of Force
To determine the direction of force, the researchers imagined a superimposed circle around the vehicle, with numbers 1 to 12 as on a clock. Each number represented a direction or angle in which the vehicle may have received damage. Figure 4 shows the number value indicating direction of force for passenger cars.
The clock-point diagram shown in Figure 4 shows direction of force for a passenger car. For instance, the direction of force for a vehicle involved in a head-on collision where force was received by the front of the vehicle would be a 12. Direction of force for a vehicle receiving damage directly from behind would be a 6. A perpendicular hit to the right side of the vehicle was shown as a 3 and a perpendicular hit to the left side was a 9.
Figure 5 shows the population of cars affected by the RTA's. Toyota is at the top that shows the highest population not because it is highly involved in accidents but generally the cars are many followed by Nissan in that order.
2.3.2. Determining the Point of Impact
The guide had a Vehicle Damage Index with diagrams of cars and arrows showing the directions of the principal impact force. These were accompanied by a detailed description of the type of damage associated with the impact. Corresponding damage description codes were also listed in the guide as shown in Table 2. In cases where vehicles were damaged in more than one area, the researchers entered the descriptions of all damaged areas, beginning with the area showing the most severe damage.
2.3.3. Determining Severity of Damage
A Vehicle Damage Scale in the guide was used by the researchers to determine the severity of damage to passenger cars involved in RTAs. The Vehicle Damage Index mentioned before determined the scale to which the researchers referred for damage resulting from specific types of crashes. The next step was to compare the damage on the vehicle with a photograph on the selected page of the Vehicle Damage Scale. If, for example, the front-end damage on the first vehicle appeared to match that on the bottom photograph on the page labelled “BC” (rear-end damage, concentrated impact), the damage description and severity rating would be “BC-6”. However, if the damage was more severe than the damage in the photo adjacent to “BC-6”, the damage description and severity rating of “BC-7” was used, and if less severe, but greater than “BC-4”, the rating was “BC-5”.
2.4. Data Analysis
Entries for each vehicle were added chronologically to a Microsoft Office Excel 2016 worksheet. For vehicles with damage to multiple areas, the make, model, year, and segment were entered on the first row only and the rest were left blank. Otherwise, each row of the spreadsheet represented a subject. This insured that the number of vehicles investigated was not inflated when the “COUNTIF” function was called.
In creating data tables, independent variables, such as vehicle make and direction of impact, were entered manually. Dependent variables (Frequency) were computed using the “COUNTIF” function, which counted the number of cells that met a certain criterion. For example, to count the number of vehicles in the J segment, the formula was entered as =COUNTIF($D$3:$D$93,L23)
in cell M23. The formula in this instance counted the number of cells with “J” (the value in L23) in cells D2 through D93. The frequency distribution was obtained by the formula: =M23/SUM ($M$19:$M$25),
again referring to the J segment instance. The “SUM” function added cell values in the range from M19 to M25, which amounted to all study subjects (70).
Appropriate charts were inserted for all tabulated data combinations.
In creating the modified clock-point in Figure 10, the opacity of the representative blocks’ transparency was directly proportional to the probability of the event occurring. This probability was obtained by treating direction of force and point of impact as two independent events. Since each direction on the clock-point scale can only result in impact on one side (for 12, 3, 6, 9) or two sides for diagonal directions, the probability of impact was calculated theoretically using the length and width of the vehicle.
For instance, a vehicle in motion in the “2” direction relative to an obstacle could have been damaged on either the front or the right side. If and were the projections of width and length in the direction of 2, the projected width would be and projected length . The probability of impact frontal impact would then be a/(a + b). It is assumed that if the study population was large, the experimental results would match the theoretical ones.
A total of 70 passenger cars were inspected and their damage following RTAs was recorded. The population consisted of 14 automotive brands distributed as shown in Table 3. Toyota was the most frequent brand constituting 33%, followed by Nissan and Mercedes Benz at 17% and 11%, respectively.
3.1. Distribution by Vehicle Segment
Vehicle classification was guided by Euro Car Segment standards. Pick-ups and medium cars (Pick-up and C segments, respectively) were the most common at 23% each. These were followed by large cars (D), SUVs, and multipurpose vehicles (MPVs), which constituted 13% of the population each. Small cars (B segment), e.g., Volkswagen Polo, made up 9% of the study population. Executive cars (E segment) were the least frequent segment present, constituting 7%. These data are presented in Table 4 and Figure 6.
3.2. Distribution by Direction of Impact
The direction of impact was dominated by 12 on the clock-point scale for passenger cars. 26% of the impacts observed were direct to the front of the vehicle (12). 1 and 11 directions had equal numbers of impacts recorded at 18% each. The rest of the distribution is shown in Table 5 and Figure 7.
3.3. Distribution by Point of Impact
Corresponding to the distribution of direction of impact, frontal damage (denoted by F) was the most common, constituting 51% of all impacts. Damage to the right side of the vehicle (R) was ranked as second at 22%, while the left (L) was third with 19%. 6% of the recorded impacts were to the rear or back of the vehicle (B). Two vehicles had rolled-over, meaning that 2% of the damage recorded was to the top (T). It may be noted that the total number of impacts recorded under direction of force is two less than that for points of impact, a difference which is accounted for by the two incidences of damage to the top of the vehicle in rollovers that could not be represented by the clock-point scale. This is shown in Table 6.
3.4. Distribution by Severity of Damage
The most severe damage on the vehicle damage scale was the most frequent, constituting 27%. Ratings 5 and 6 had made up 17% and 12%, respectively. 19% of the damaged areas investigated were given a rating of 4, while ratings of 1, 2, and 3 constituted 4%, 8%, and 13%, respectively. This is shown in Table 7 and Figure 8. Figure 9 shows the frequency distribution by the severity of damaging and 7 is has the highest frequency. Figure 10 shows the frequency distribution by severity of damaging.
3.5. Probability of Damage Distribution
The summary of the frequency distribution of direction of force, point of impact and severity is presented in.
Health emergencies occur in passenger cars where victims do not have immediate access to either layperson or professional, proper medical services, resulting in deterioration of their health or death. Studies have shown that human intervention in the form of first aid given to victims of RTAs can preserve life, prevent further harm, and promote recovery in most cases. Of course, it works only when given properly, and the sad truth is that there are high chances of victims not getting proper help for reasons including absence of bystanders, responders fearful of legal action should they make mistakes, and entrapment of victims in the wreckage, thus being inaccessible. A robotic first aid system has therefore been proposed by the authors for installation in passenger cars. The usefulness of the robotic first aid system depends on its survival of RTAs, yet damage patterns on passenger cars involved in RTAs remain unclear. Identification of areas on the vehicle that are most prone to damage in RTAs will facilitate definition of specifications and parameters for the robotic first aid system, including location and size.
In this study, the researchers investigated the damage on passenger cars involved in RTAs. Information obtained included the direction of force or impact, the point of impact, and severity of the impact on all damaged areas. Damage rating was guided by the Vehicle Damage Guide for Traffic Crash Investigators published by the Texas Department of Transportation, USA. The various vehicle segments and accident types studied represent a variety of common impacts that the robotic first aid system should not be exposed to or at least should survive with minimal damage. The most common and severe damage was to the front of the vehicle, followed by the rear and sides. This finding confirms the results from studies in the literature. Moreover, the whole body of the car, including the roof, was found vulnerable to the most severe damage on the damage rating scale. It is therefore advisable to place the robotic first aid system away from the periphery of the vehicle. Axiomatically, all components near the vehicle’s body are also prone to damage and incapacitation.
From the 70 vehicles studied, two rollovers were recorded, one on an SUV and the other on a pick-up truck. Studies in the past have also shown that such vehicles have a higher propensity to rollover than smaller, lighter cars. However, this does not dismiss the possibility of such crashes in smaller vehicles, and the roof should also be avoided in placement of the RFA system.
Having discredited all four sides of the vehicle as well as its roof, the safest place for the RFA system is in the middle of the car, closest to the floor as possible. Furthermore, components which are essential to the operation of the RFA system should be placed in the same manner. For instance, the RFA system will require a power source for it to carry out its tasks. It is not advisable to design one which draws power from the vehicle’s main battery, which is in an area with the highest probability of damage, the front, lest it is damaged or disconnected upon impact and renders the RFA system useless.
The study was limited by the data collection method of visual inspection. Research shows that the information generated by human inspection is mostly qualitative and thereby subjective . Moreover, vehicle damage ratings were heavily dependent upon the skill and judgement of the researchers, who had no experience or training in the process. A more experienced car crash damage assessor could have obtained different results. Therefore, there may be little consistency between different inspectors. However, the consistency of the researchers in using the vehicle damage indices on various vehicles is high and subjectivity can be neglected.
In addition to this, the researchers did not utilise exceptions outlined in the Vehicle Damage Guide. These were to be referred in cases where vehicles had acquired damage from occurrences besides the types of impacts described in the damage description table. For instance, some vehicles had sustained top damage only but were classified under side-parallel or angular impact. Hence damage was not correctly assessed and accurately recorded in these instances. Although the data collected may not accurately describe the damage on a vehicle, they do highlight the areas damaged, which is what is required in the parent-work to this study, the design of a RFA system.
5. Recommendations and Conclusion
This research aimed at studying vehicle damage patterns on passenger cars involved in road traffic accidents and is part of larger work of designing a robotic first aid system for passenger-car occupants. The robotic first aid system should survive road traffic accidents; thus, it should be in the safest place available in the vehicle. The front of the vehicle is the most vulnerable in car crashes, with the highest probability of severe damage in crashes. The sides and rear are also prone to damage in car crashes although to a lesser extent. The front, rear, sides, and roof, therefore, should be avoided to minimise chances of damage. Furthermore, it is advised that the system does not depend on components in the proximity of the vehicles body for its operation. Damage of such components could render the system useless when it is needed the most. This leaves the middle of the vehicle, away from the roof and towards the floor. However, although damage reaching the middle of the car was recorded on a few instances, there is need for further research into the magnitude of impact that could reach the middle of different vehicles to define the strength of the robotic first aid system. As the study has demonstrated, the robotic first aid system should be modular, self-sufficient, and structurally sound. For future studies, it is important and necessary to consider bigger cities and confusion that can lead to accidents. Indeed in high confusion big city a traffic model could be approached and to it to relate possible accidents . It is topical indeed where most cars are being designed in mass production, population is increasing, and everyone is hurrying up to arrive in time that congestion becomes a major issue . In particular, they suggested a cellular automata model on a complex network to simulate the motion of vehicles along streets, coupled with a congestion aware routing at street crossings. Such routing makes use of the knowledge of agents about traffic in nearby roads and allows the vehicles to dynamically update the routes towards their destinations. By implementing the model in real urban street patterns of various cities, they showed that it is possible to achieve a global traffic optimization based on local agent decisions. This will be important to reduce accidents and is of concern and can be considered in the future.
A. Raw Data
See Table 8.
|RFA:||Robotic First Aid|
|RTA:||Road Traffic Accident|
|SUV:||Sport Utility Vehicle.|
The data used to support the findings of this study are available from the corresponding author upon request.
Conflicts of Interest
The authors declare that there are no conflicts of interest regarding the publication of this article.
This work was supported by a roadside vehicle assistance company. The views and conclusions expressed in this paper are those of the authors and have not been sponsored, approved, or endorsed by the organisation.
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