Seat Belt Research Articles

A Quantitative Method to Guide the Integration of Textile Inductive Electrodes in Automotive Applications for Respiratory Monitoring

Abstract: Induction-based breathing sensors in automobiles enable unobtrusive respiratory rate monitoring as an indicator of a driver’s alertness and health. This paper introduces a quantitative method based on signal quality to guide the integration of textile inductive electrodes in automotive applications. A case study with a simplified setup illustrated the ability of the method to successfully provide basic design rules about where and how to integrate the electrodes on seat belts and seat backs to gather good quality respiratory signals in an automobile. The best signals came from the subject’s waist, then from the chest, then from the upper back, and finally from the lower back. Furthermore, folding the electrodes before their integration on a seat back improves the signal quality for both the upper and lower back. This analysis provided guidelines with three design rules to increase the chance of acquiring good quality signals: (1) use a multi-electrode acquisition approach, (2) place the electrodes in locations that maximize breathing-induced body displacement, and (3) use a mechanical amplifying method such as folding the electrodes in locations with little potential for breathing-induced displacement.

Using anthropometry-based scaling to predict responses across sex in reclined frontal impact sled tests

Objective Field data studies have suggested greater injury risk in motor vehicle crashes for females compared to males. Data on female responses may provide more insight into these sex-based differences in injury risk, but few sled tests have been conducted with female subjects, with most cases being of either small or obese anthropometries. Since numerous sled tests have been conducted using mid-size male post mortem human subjects, anthropometry-based scaling of mid-size male responses is a potential approach to leverage this mid-size male data for a broader range of applicability. This study aimed to determine if scaling to predict female responses from male responses is suitable for a reclined condition and evaluate the effectiveness of varying anthropometry-based scaling techniques in predicting female responses from male responses. Methods Data from frontal impact sled tests conducted on four mid-size male and three mid-size female post mortem human subjects in a reclined posture were used. Geometric scaling using dimensional analysis (equal stress-equal velocity approach) was then implemented on the male data to test the effect various scale factors had on predicting female response. These scaling factors were based on mass, stature, torso height, torso volume, and torso volume at torso height. Results Predictions results varied, with lap belt force and forward excursions of bony landmarks yielding high overall prediction scores and vertical excursions of bony landmarks yielding lower overall prediction scores. Generally, the unscaled responses also yielded high prediction scores, and while scaling offered an improvement to the overall prediction score, this suggested that anthropometry-based differences may not fully explain male-female differences in reclined occupant response. Torso volume yielded the highest overall prediction score for the greatest number of responses, but the anthropometry measure that yielded the highest average overall prediction score across all responses varied. Conclusions Marginal differences in the predictive capabilities of the different anthropometry-based measures were found, but, in general, anthropometry was not able to fully explain differences in the responses observed between sex. Overall, this study highlighted the need for further whole body sled tests with mid-size female PMHS to further investigate male-female differences in occupant kinematics.

Management of traumatic duodenal rupture in children-case series

BackgroundTraumatic duodenal rupture is rare which accounts for only 2–10% of all Blunt abdominal trauma. The purpose of this study was to investigate the experience of diagnosis and treatment of traumatic duodenal rupture in children.MethodsThis was a retrospective case series study. Clinical data were collected from three children suffering from a traumatic duodenal rupture who received surgical treatment in our hospital from January 2013 to January 2023. Demographic characteristics, trauma mechanism, physical examination, auxiliary examination, operation timing and plan, postoperative management and follow-up of included patients were described. Summarize the importance of early diagnosis and treatment of this type of injury.ResultsThree children (1 male and 2 females) with duodenal rupture due to traumatic abdominal injury were included in the study, with average age of 8.2 years (range 2.75–13.25 years). Among them, One child was injured by heavy objects. The other two children had lumbar fracture and seat belt sign. All three patients underwent emergency operation within 24 h, and recovered well after surgery. No related complications seen during follow-up.ConclusionsDuodenal rupture is a rare but fatal disease. Early identification and active abdominal exploration can reduce the incidence of related complications and mortality in children with blunt abdominal injury, especially those with seat belt sign. Simultaneously, the standardized postoperative management is significant for the cure of children.

SIGMOID COLON TRANSECTION FOLLOWING A SEAT BELT INJURY: A CASE REPORT

Background: Seatbelts have reduced the number of fatal head, chest and abdominal injuries. They have, however, introduced a set of injuries comprising abdominal wall bruising, Intra-abdominal injuries, and lumbar spine fractures collectively termed the seat belt syndrome. Case presentation: A 60-year-old man who was transferred to our emergency department after sustaining a blunt abdominal trauma after a road traffic accident. An exploratory laparotomy was performed revealed a sigmoid transection that was treated by an Hartmanns pouch procedure. After further management, the patient was discharged with no further complaints. Conclusion: The presence of a seatbelt sign should raise the suspicion of a significant intra-abdominal injury. Responding to clinical signs is critical and early diagnosis and management reduces morbidity and mortality.

Response of safety belt webbing used for formula student race car in a frontal collision

A particularly important element for ensuring the passive safety of a vehicle is the seat belt. In automotive engineering, the study of this subassembly is given special attention, because it plays a key role among the multiple safety systems, active and passive, that currently equip a vehicle. The paper studies several ways in which belt webbing can be damaged during use and how these defects can influence the behavior of the webbing. For this purpose, using the Finite Element Method (FEM) based on a mechanical model that considers the vehicle-driver-seat belt assembly, the forces that appear in the seat belt in the event of a frontal collision are determined. Experimental determinations carried out in the laboratory by the authors provide the mechanical properties modified following the failures. By introducing these mechanical properties into the developed model, it will be determined how the safety belt webbing responds in the event of a collision with a wall. A comparison is made between the behavior of the “new state” belt and one with defects in order to estimate the damage that can be caused by the appearance of the defects considered in the work.

Alcohol perceptions and driving decisions among adolescents: Exploring the role of peer and parental influences in Virginia

Objective This study aims to explore the role of peer and parental influences on adolescent driving behaviors, particularly concerning distracted and alcohol-impaired driving, in light of the significant number of road accidents and fatalities involving young drivers. Methods A cross-sectional study was conducted using data from the IMPACT program. Adolescents aged 14 to 19 in the Richmond area were recruited from local high schools through convenience sampling. Parental consent was obtained via media release forms provided by Virginia Commonwealth University (VCU), with students having the option to opt out of participation. Self-report surveys were administered during IMPACT program events and captured via REDCap. The surveys included demographic information, driving history, driving behaviors, alcohol attitudes, drinking and driving behaviors, and a driving knowledge section. Results The mean age of participants was 15.230 years (SD = 1.545). Gender distribution was as follows: Female 53.1% and male 42.1%. Racial distribution included White/Caucasian (48.9%), Black/African American (22.4%), and multiple races (8.8%). Peer influence on drinking and driving was significant (P = .038). Driving under the influence was associated with both parental and peer influence (P < .050). A positive correlation was found between peer digital distraction and car crashes (coefficient = 0.038, P = .038). Additionally, parental alcohol-impaired driving was linked to decreased positive attitudes among adolescents toward driving under the influence (coefficient = −0.024, P = .000). Though parent distracted driving positively influenced adolescent driving behavior, this effect was not statistically significant (coefficient = 0.008, P = .320). Conclusion The findings indicate a significant reduction in risky behaviors such as drinking and driving and an increase in seat belt use among adolescents. There is heightened awareness regarding the dangers of texting and driving. A multifaceted approach was effective in improving attitudes and practices related to driving safety.

Simulating Pelvis Kinematics from Belt and Seat Loading in Frontal Car Crash Scenarios: Important Boundary Conditions that Influence the Outcome.

The risk of submarining during automotive crashes, defined by the lap belt sliding off the pelvis to load the abdomen, is predicted to increase in future autonomous vehicles as greater variation in seating position is enabled. Biofidelic tools are required to efficiently design and evaluate new and/or improved safety systems. This study aims to evaluate the pelvis response sensitivity to variations in boundary conditions that directly influence the pelvis loads, deemed important for the submarining outcome, to facilitate a more precise comparison between finite element human body models (FE-HBMs) and post-mortem human subjects (PMHSs). A parameter study, using a one-variable-at-a-time analysis (low/high) of belt friction, seat friction, seat stiffness, and (on/off) for added belt bending stiffness, was performed using a state-of-the-art FE-HBM in four different test scenarios; one stationary, two sleds with upright occupant posture, and one sled with reclined occupant posture. In the stationary scenario, both belt friction and belt bending stiffness influenced the belt folding behavior, which consequently affected the belt-to-pelvis angle at submarining. In the sled scenarios, only seat friction was found to influence the pelvis kinematics and submarining outcome, with the most biofidelic response resulting from both the low (0.2) and high (0.5) friction coefficient depending on the scenario. To reduce uncertainty in boundary conditions affecting the external pelvis loads and increase confidence in FE-HBM to PMHS comparisons, it is recommended that future experiments evaluate the PMHS to seat friction coefficient and that new belt modeling methods that accurately capture belt folding when interacting with soft tissues are developed.

Analysis of traffic injury trends, and strategies for road safety promotion in Lithuania

Abstract Every year, about 1.3 million people die on the world’s roads. The aim of the study was to analyze the mortality trends from traffic injuries, and to discuss strategies for the prevention of road traffic injuries and road safety promotion in Lithuania. A longitudinal study was conducted, and regression analysis was applied. The study showed that, when analyzing the changes in mortality from the main causes of death over 2009-2019, the greatest progress in mortality reduction was observed in the category of deaths from external causes; whereas, the number of deaths from diseases of the circulatory system did not change, and the number of deaths from malignant tumors increased slightly. In Lithuania, the death rate from traffic injuries per 100,000 inhabitants decreased significantly over a 50-year period (1971-2020) (in the whole population, and in the subgroups of men and women). In Lithuania, during the fifty-year period (1971-2020), pedestrian mortality rates decreased significantly in the whole population, and children and adolescents (0-14, 15-19, and 0-19 years). Over 1998-2020, road traffic injury deaths decreased significantly in children age groups 0-14, 15-19, and 0-19. After exploring the preventive strategies used for road safety promotion, it was revealed that the most effective results were achieved, when education, safe environment creation, and legislation with enforcement were used. It was important to create a safe engineering environment, to separate pedestrian and bicycle paths from high-speed traffic on roads, to improve the visibility of road users, to apply measures that reduce driver’s fatigue, and to combat the usage of mobile phones while driving. Preventive activities were aimed at alcohol control, speed limitation, education of safe behavior of drivers, promotion of safe cars operation. The usage of safety belts and safety seats, helmets for motorcyclists and cyclists were increased through legislative and educational measures.

Novel Methodology to Detect Non-Compliant Usage of Seat Belt in a Passenger Car

Novel Methodology to Detect Non-Compliant Usage of Seat Belt in a Passenger Car

Driving License Management System Using Finger Print Sensors with Seat Belt Monitoring System

The finger print based driving license management is an advanced technology that is designed for security purposes. This system consists of a fingerprint sensor, which is used to identify the status of the driver, whether he/she obtained a license or not. This is a very highly secured system. The driver's fingerprint is already stored in the system for comparison purposes. Nowadays, accidents are increasing day by day. In the recent days minor people are driving the vehicles without the license; this may cause future accidents. In order to conquer this, we proposed this system. This system not only checks the license status, and here a further IR sensor is used to check whether the seat belt wore or not. By using this system, there are tremendous advantages, like accidents will be reduced, high security, and reduced vehicle theft. Keywords: Finger print sensor, microcontroller, and IR sensor.

Rear passenger restraint in frontal NCAP tests compared to the right-front passenger

Objective This study compared kinematic and biomechanic responses of the 5th female Hybrid III in the right-rear and right-front passenger seats in frontal NCAP tests with 2015–16 MY vehicles. It focused on the lap-shoulder belt restraint of the rear passenger. Methods Eleven frontal NCAP tests were conducted by NHTSA at 56 km/h with a lap-shoulder belted 5th Hybrid III dummy in the right-rear and right-front seats. The right-front passenger had pretensioning and load limiting belts and advanced airbags with inflatable knee bolster. The rear passenger had seatbelts without pretensioning or load limiting. The kinematic and biomechanical responses of the 5th Hybrid III dummy in the rear and front were analyzed. The tests included onboard video cameras covering the rear and front passenger. Lap and shoulder belt loads were measured. The responses were compared for the two seating positions and restraint systems. Results Only one of 11 vehicles had favorable restraint of the right-rear passenger. All vehicles passed criteria for the right-front passenger. The right-rear passenger HIC15 was 888 ± 314 (779 IARV) significantly higher than 242 ± 72 in the right-front passenger (t = 6.36, p < 0.001). The right rear Nij was 1.16 ± 0.19 (1.00 IARV) significantly higher than 0.46 ± 0.11 in the right-front (t = 9.18, p < 0.001) and the rear chest deflection was 46.1 ± 9.8 mm (42 mm IARV) significantly higher than 20.8 ± 5.6 mm in the right-front (t = 7.12, p < 0.001). The shoulder belt load was 8,771 ± 2,088 N on the right-rear passenger significantly higher than 3,564 ± 911 N on the right-front (t = 7.28, p < 0.001). Three of the 11 crash tests involved submarining by the right-rear passenger at 76.0 ± 7.2 ms. Two tests with submarining involved the seatbelt buckle lifting by shoulder belt load pulling the lap belt onto the abdomen. One test involved compressing the front of the seat cushion with the H-point dropping, the pelvis rotating rearward and the lap belt sliding onto the abdomen. Conclusions Restraining loads on the rear passenger were significantly higher than on the right-front passenger in 2015–16 MY vehicle NCAP tests. The HIC15 was 3.7-times higher in the rear passenger than the front. The Nij was 2.5-times higher and chest deflection was 2.2-times higher. The dummy responses were significantly higher in the rear seat compared to the front seat because of greater restraining loads, submarining and a hardware failure in NCAP tests. The lack of pretensioning, load limiting and airbags involved higher injury risks in the rear passenger compared to the right-front passenger.

Effect of load limiting the shoulder-belt on right-front passenger kinematics in oblique-offset and NCAP frontal crash tests

Objective The effect of shoulder-belt load-limiting was evaluated on right-front passenger kinematics in 90 km/h oblique OMDB (offset moving deformable barrier) impacts and compared to kinematics in 56 km/h NCAP crash tests. The study focused on the influence of webbing pulling out of the retractor increasing forward excursion of the upper torso and head. Methods 18 OMDB crash tests were conducted by NHTSA at 90 km/h. The barrier was aligned at a 15 deg angle to the left (345 deg PDOF) with 35% overlap of the struck vehicle. The kinematics and biomechanical responses of the 50th THOR passenger dummy were analyzed. The tests included 3 onboard video cameras covering the front occupants. The lap and shoulder belt loads were measured and displacement of the shoulder belt was available for most tests. The responses were compared to those in 11 NCAP frontal impacts at 56 km/h with a 5th Hybrid III passenger. Results The delta V was 62.6 ± 2.8 km/h in the passenger car OMDB tests. The pretensioners and airbags deployed by 40 ms. The pretensioner pulled in −62 ± 29 mm of webbing at 13–15 m/s. With the retractor locked, belt loads increased as the passenger moved forward and inboard. The load-limiter paid out 280 ± 67 mm of shoulder belt webbing at 6–11 m/s and peak load of 4,170 ± 557 N. The shoulder belt slipped off the shoulder at 97 ± 10 ms. By 120 ms, the left shoulder impacted the center of the instrument panel and the head either impacted the panel or perched on the left edge of the airbag with the head rotated 80–135 deg about the z-axis (eyes right). There was 187.3 ± 37.4 mm of loose webbing after the test. Similar dummy responses were seen in the SUV and truck tests. In contrast, the passenger kinematics were centered on the airbag in NCAP tests without impact on the interior. Conclusions Excursion of the upper torso with the load-limiting shoulder belt enabled the belt to slip off the right shoulder in ODMB tests. The passenger flexed forward around the lap belt with impact on the center of the instrument panel. The upper torso lacked sufficient restraint with the level of load limiting in the tests. The belts were loose after pretensioning and load-limiting reducing the restraint effectiveness if there were a second or third impact or rollover in the collision sequence.

Improved YOLOv7 Electric Work Safety Belt Hook Suspension State Recognition Algorithm Based on Decoupled Head

Safety is the eternal theme of power systems. In view of problems such as time-consuming and poor real-time performance in the correct use of seat belt hooks by manual supervision operators in the process of power operation, this paper proposes an improved YOLOv7 seat belt hook suspension state recognition algorithm. Firstly, the feature extraction part of the YOLOv7 backbone network is improved, and the M-Spatial Pyramid Pooling Concurrent Spatial Pyramid Convolution (M-SPPCSPC) feature extraction module is constructed to replace the Spatial Pyramid Pooling Concurrent Spatial Pyramid Convolution (SPPCSPC) module of the backbone network, which reduces the amount of computation and improves the detection speed of the backbone network while keeping the sensory field of the backbone network unchanged. Second, a decoupled head, which realizes the confidence and regression frames separately, is introduced to alleviate the negative impact of the conflict between the classification and regression tasks, consequently improving the network detection accuracy and accelerating the network convergence. Ultimately, a dynamic non-monotonic focusing mechanism is introduced in the output layer, and the Wise Intersection over Union (WioU) loss function is used to reduce the competitiveness of high-quality anchor frames while reducing the harmful gradient generated by low-quality anchor frames, which ultimately improves the overall performance of the detection network. The experimental results show that the mean Average Precision (mAP@0.5) value of the improved network reaches 81.2%, which is 7.4% higher than that of the original YOLOv7, therefore achieving better detection results for multiple-state recognition of hooks.

Effect Analysis of Different Use Ways of a Q10 Child Seat

In this paper, the injury situation of Q10 child dummy was optimized and analyzed by analyzing the impact of different ways of using a certain child seat ,and analyzing the crash test data of a real car based on LS-DYNA crash simulation analysis software after the vehicle benchmarking, by elaborating on the protection of child occupants in different ways of using this type of child seat, so as to provide a reference for the development of child restraint system of new cars. The results show that: Regardless of whether this type of child seat has an optional seat back, adding seat belt Secure Guard and not using ISOFIX fixing, the dummies' injuries show a decreasing trend. This study provides reference for the selection and use of this type of child seat in dynamic test.

Study of Pattern of Craniofacial Injuries in Road Traffic Accident Cases Autopsied in Midnapore Medical College

Background: The objective of this study was to investigate the pattern of craniofacial injuries in victims of fatal road traffic accidents, observed through autopsies conducted at Midnapore Medical College, West Midnapore from January 2021 to December 2023. Methods: It is a retrospective, cross- sectional observational study. Data was collected by thorough analysis of the injuries documented in post-mortem reports of all the alleged road traffic accident cases where victim sustained Cranio- facial injuries within a time span of 3 years, from 1st January 2021 to 31st December, 2023. Data was analysed using Microsoft Excel. Conclusion: The study highlights the necessity of context-specific interventions to address the unique injury patterns observed in West Midnapore's road traffic accidents. Improving road infrastructure, raising traffic safety awareness, and promoting protective measures like seat belts and helmets can reduce severe craniofacial injuries. The prevalence of maxillofacial fractures underscores the face's vulnerability, with long-term physical and psychological impacts. Effective prevention strategies, such as strict traffic regulations and awareness campaigns on the dangers of distracted or impaired driving, are essential. Despite limitations, the study provides valuable insights into craniofacial injury patterns in fatal accidents, stressing the need for enhanced road safety, stronger traffic laws, and better post-accident care. Interdisciplinary collaboration among healthcare professionals, law enforcement, and policymakers is crucial for developing comprehensive strategies to manage and prevent these injuries. By examining regional injury characteristics and comparing them with other studies, this research contributes to the broader understanding of craniofacial trauma, offering significant implications for improving road safety, trauma care, and forensic practices.

Predicting risky driving behaviours using the theory of planned behaviour: A meta-analysis

The current meta-analysis explored the efficacy of the theory of planned behaviour (TPB) in predicting high-risk driving behaviours. Specifically, we examined speeding (in relation to exceeding the limit as well as speed compliance), driving under the influence, distracted driving, and seat belt use. We searched four electronic databases (i.e., PubMed, Web of Science, Scopus, and ProQuest) and included original studies that quantitatively measured the relationships between the TPB variables (attitude, subjective norm, perceived behavioural control [PBC], intention, and prospective/objective behaviour). The study identified 80 records with 94 independent samples. Studies were assessed for risk of bias using the JBI checklist for cross-sectional studies and compliance with the TPB guidelines. Together, attitude, subjective norm and PBC explained between 30 % and 51 % of variance found in intention, with attitude showing as the strongest predictor for intention across the different driving behaviours. The findings also showed that the model explained 36 %–48 % variance found in predicting the observed and/or prospective behaviours for distracted driving, speed compliance and speeding. Understanding the varying strengths and thus relative importance of TPB constructs in predicting different risky driving behaviours is crucial for developing targeted road safety interventions.

Yasri Miftah Joenoes

Background: Mining accidents in truck transportation activities are the most common accidents in the mining industry in Southeast Sulawesi Province in the last 3 years and often cause fatalities. Previous studies have not identified all types of dominant causes of mining accidents in truck transportation activities, be it direct causes, basic causes, or lack of management control. The purpose of this study is to analyze the causes of mining accidents in truck transportation activities in the Southeast Sulawesi Region in 2021-2023. Method: The research used is qualitative phenomenology to understand and describe the dominant accident-causing factors from mining accident phenomena in transportation activities using trucks. Results: The dominant causes of mining accidents in truck transportation activities in Southeast Sulawesi Province in 2021-2023 were: driving above the speed limit; drivers not wearing safety belts and helmets; downhill road conditions with a grade above 12% and long; drivers lack knowledge/skills; lack of supervision; and inadequate SOP and HIRA. Conclusion: Corrective actions that can be taken to minimize the occurrence of mining accidents in truck transportation activities are: increasing supervision and socialization related to speed limits, as well as the use of safety belts and helmets; striving for engineering, maximizing supervision and completing road signs on downhill road segments with grades above 12% and long; implementing new worker training and annual refresher courses with output in the form of SIMPER which is valid for a maximum of 1 year; meeting the needs/ratio of operational supervisors, and ensuring that SOP and IBPR are adequate for truck transportation activities.

Vienna road crashes: a multivariate approach to understanding driver-related risks

Road safety is worldwide researched field where crashes play a causal role and injuries are counted as outcomes. Approaches and techniques are diverse, but with same goal—contribute to safer road environment for everyone included. Drivers of personal vehicles are the most protected traffic group due to protection provided by vehicle and mandatory safety belt in comparison to pedestrians as the most venerable participants. Also, this group of drivers is characterized by the high presence of very young drivers whose psychological characteristics place them in a vulnerable risky subgroup. According to the original data of the traffic police on crashes of personal car drivers in the town of Vienna, since 2010 they have had the highest number of crashes in 2012 and after slow decrease is recorded. Still high in total number of crashes involving only drivers of personal vehicles from a traffic safety point of view this still represents an extremely worrying problem that has not received proper social attention. In response to knowledge gaps, this research is essential to address leading characterizations in crashes with aim to answer what is trend in crash occurrence during 2010–2020 inside Vienna municipality, and what is predicted trend. Is there significant and distinctive difference based on gender and age with conditions under which crashes are occurring influencing different injury degree. Multiple regression undoubtedly points fields for action in statistically based findings providing the most important answer to this research: why there are so many injuries and what is leading cause of them. Answering this question contributes toward higher safety environment for all participants.

Study of the effects of different mechanical mishaps or Traumatic Brain Injury(TBI) on brain region: A Review

The following concerns and measures of neurotrauma are discussed here: It expands more on the protection role that the skull encompasses regarding the encephalon together with a detailed explanation of the effects of head injuries and their implications, which may include coma or death as a result of fractures or dysfunctions. The text gives descriptions of the incidence, especially in car-related accidents, and details about TBI such as the symptoms and the issues likely to occur as a result of the injury. The paper also draws attention to certain dangerous behaviors; such as; non-utilization of seat belts, driving when drunk, no helmet usage, and inadequate supervision to eliminate traumatic brain injury. Among the changes in management of the TBIs whether surgical or through medication, the text lastly highlights the fact that more emphasis has been placed on preventing this condition than on finding a cure for it.

Effects of seatback angles on passenger kinematics among the longitudinal braking scenario

With the development of autonomous vehicles and zero gravity seats, the passengers are more likely to sit in their preferred postures, such as the high reclined positions. This study aims to analyse the passenger kinematics under different seatback angles by volunteer experiments, which is beneficial for future smart restraint system development. For this study, four volunteers were selected to participate in the longitudinal braking experiments from 80 km/h to 0 km/h, and each volunteer repeated 3 times. Among the tests, three seatback angles (25°, 45°, and 60° from the vertical) were introduced, while the seat pan angles were the same. The seatbelt forces, as well as the volunteers’ motions were recorded among the experiments. The experimental results indicated that both head displacement and the first thoracic vertebrae (T1) displacement increased gradually with the increase of the seatback angle. The average T1 displacements for four volunteers under 25° seatback angle were between 180.2 mm to 245.5 mm, while the T1 displacements for 45° seatback angle and 60° seatback angle were between 291.4 mm to 374.3 and 366.2 mm to 444.5 mm respectively. Both shoulder belt force and lap belt force increased with the increase of seatback angle, except for the 60° case of No.1 volunteer, which might due to the muscle activation level difference. In this study, there was no significant correlation between the seatback inclination angle and the amount of seat belt outlet amount. The study is beneficial for active human model validation and future smart restraint system development.