Vision based traffic conflict analysis

2013 ◽  
Author(s):  
S. Battiato ◽  
G. M. Farinella ◽  
O. Giudice ◽  
S. Cafiso ◽  
A. Di Graziano
Keyword(s):  
Conflict Analysis ◽  
Traffic Conflict

scholarly journals Surrogate Safety Analysis of Pedestrian-Vehicle Conflict at Intersections Using Unmanned Aerial Vehicle Videos

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Peng Chen ◽  
Weiliang Zeng ◽  
Guizhen Yu ◽  
Yunpeng Wang
Keyword(s):  
Data Extraction ◽  
Cost Effective ◽  
Safety Analysis ◽  
Conflict Analysis ◽  
Unmanned Aerial Systems ◽  
Trajectory Data ◽  
High Exposure ◽  
Safety Issues ◽  
Traffic Conflict ◽  
Aerial Systems

Conflict analysis using surrogate safety measures (SSMs) has become an efficient approach to investigate safety issues. The state-of-the-art studies largely resort to video images taken from high buildings. However, it suffers from heavy labor work, high cost of maintenance, and even security restrictions. Data collection and processing remains a common challenge to traffic conflict analysis. Unmanned Aerial Systems (UASs) or Unmanned Aerial Vehicles (UAVs), known for easy maneuvering, outstanding flexibility, and low costs, are considered to be a novel aerial sensor. By taking full advantage of the bird’s eye view offered by UAV, this study, as a pioneer work, applied UAV videos for surrogate safety analysis of pedestrian-vehicle conflicts at one urban intersection in Beijing, China. Aerial video sequences for a period of one hour were analyzed. The detection and tracking systems for vehicle and pedestrian trajectory data extraction were developed, respectively. Two SSMs, that is, Postencroachment Time (PET) and Relative Time to Collision (RTTC), were employed to represent how spatially and temporally close the pedestrian-vehicle conflict is to a collision. The results of analysis showed a high exposure of pedestrians to traffic conflict both inside and outside the crosswalk and relatively risking behavior of right-turn vehicles around the corner. The findings demonstrate that UAV can support intersection safety analysis in an accurate and cost-effective way.

scholarly journals Safety Performance Evaluation of a Three-Leg Unsignalized Intersection Using Traffic Conflict Analysis

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Guoqiang Zhang ◽  
Jun Chen ◽  
Jingya Zhao
Keyword(s):  
Prediction Model ◽  
Video Camera ◽  
Conflict Analysis ◽  
Safety Performance ◽  
Time To Collision ◽  
Time Headway ◽  
Independent Variables ◽  
Minor Road ◽  
Traffic Conflicts ◽  
Traffic Conflict

Traffic conflicts were used to evaluate safety performance of a three-leg unsignalized intersection. With the aid of a video camera, data were collected at the intersection and 15-second time span was used in each observation to overcome the drawbacks of traditional methods of traffic conflict analysis. Time to collision (TTC), a widely accepted indicator, was used to identify whether an interaction between two vehicles was a traffic conflict. By using Poisson regression, a prediction model for traffic conflicts at the intersection was developed. Based upon the model, assuming that other factors remain constant, when time headway or speed of eastbound traffic on major road, which is crossed by left-turning traffic from minor road, increases, the number of traffic conflicts at the intersection decreases. When volume of left-turning traffic on minor road or speed of left-turning vehicles on minor road increases, the number of traffic conflicts at the intersection increases if other factors remain constant. Explanations for the influence of the factors, which were represented by independent variables of the prediction model, were then analyzed in detail.

scholarly journals Intersection Safety Assessment Using Video-Based Traffic Conflict Analysis: The Case Study of Thailand

2021 ◽  
Vol 13 (22) ◽  
pp. 12722
Author(s):  
Nopadon Kronprasert ◽  
Chomphunut Sutheerakul ◽  
Thaned Satiennam ◽  
Paramet Luathep
Keyword(s):  
Road Transport ◽  
Conflict Analysis ◽  
Crash Risk ◽  
Future Research ◽  
Related Factors ◽  
Crash Data ◽  
Time To Collision ◽  
Risk Of Death ◽  
Traffic Conflict ◽  
Local Road

In the road transport network, intersections are among the most critical locations leading to a risk of death and serious injury. The traditional methods to assess the safety of intersections are based on statistical analyses that require crash data. However, such data may be under-reported and omit important crash-related factors. The conventional approaches, therefore, are not easily applied to making comparisons of intersection designs under different road classifications. This study developed a risk-based approach that incorporates video-based traffic conflict analysis to investigate vehicle conflicts under mixed traffic conditions including motorcycles and cars in Thailand. The study applied such conflict data to assess the risk of intersections in terms of time-to-collision and conflict speed. Five functional classes of intersections were investigated, including local-road/local-road, local-road/collector, collector/arterial, collector/collector, and arterial/arterial intersections. The results showed that intersection classes, characteristics, and control affect the behavior of motorists and the safety of intersections. The results found that the low-order intersections with stop/no control are high risks due to the short time-to-collision of motorcycle-related conflicts. They generate frequent conflicts with low chance of injury. The high-order intersections with signal control are high risks due to high conflicting speeds of motorcycle–car conflicts. They generate few conflicts but at a high chance of injury. The study presents the applicability of video-based traffic conflict analysis for systematically estimating the crash risk of intersections. The risk-based approach can be deemed as a supplement indicator in addition to limited crash data to evaluate the safety of intersections. However, future research is needed to explore the potential of other road infrastructure under different circumstances.

Improving pedestrians safety by using the traffic conflict analysis technique

2012 ◽  
Author(s):  
Erdenetuya Amgalan ◽  
Tsevegjav Tsevegmid ◽  
Myagmarjav Jigjjav ◽  
Khashbat Jamba ◽  
Bazarragchaa Ichinnorov ◽  
...  
Keyword(s):  
Conflict Analysis ◽  
Analysis Technique ◽  
Traffic Conflict

Effects of Inadequate Driveway Corner Clearances on Traffic Operations, Safety, and Capacity

1997 ◽  
Vol 1579 (1) ◽  
pp. 35-42 ◽  
Author(s):  
Cheng-Tin Gan ◽  
Gary Long
Keyword(s):  
Conflict Analysis ◽  
Traffic Operations ◽  
Inventory Data ◽  
Flow Rates ◽  
Left Turn ◽  
Turn Signal ◽  
Arterial Streets ◽  
Operational Safety ◽  
Traffic Conflict ◽  
Saturation Flow

Inadequate driveway corner clearances can result in traffic operational, safety, and capacity problems. These problems can be caused by blocked driveway ingress and egress movements, incomplete turning maneuvers, conflicting intersection turning movements, confusing right-turn signal indications, insufficient weaving and merging section lengths, and various other conflicts. The effects of driveway corner clearances on safety cannot be examined easily through safety records given the current condition of the available crash and system inventory data. This provides incentives for applying theoretical traffic conflict analysis. A simple conflict analysis showed an increase in merging and crossing conflict points for driveways situated near intersections. Inadequate corner clearance can have a capacity-reducing effect. Driveway capacity may be reduced by ( a) vehicles on the arterial blocking driveway egress movements and ( b) a decreased opportunity for left-turn egress movement on arterial streets designed for platoon progression. Intersection capacity can also be reduced by a decrease in saturation flow rates due to driveway ingress and egress movements.

scholarly journals Safety Level Of Pedestrian In Urban Area

2019 ◽  
Vol 24 (4) ◽  
pp. 335
Author(s):  
Prima Juanita Romadhona
Keyword(s):  
Urban Area ◽  
Urban Areas ◽  
Conflict Analysis ◽  
Speed Limit ◽  
Vehicle Speed ◽  
Residential Areas ◽  
Safety Level ◽  
Road Users ◽  
Road Sign ◽  
Traffic Conflict

There are other road users who have high rates involvement as victims of accidents, namely vulnerable road users such as pedestrians. The study concern to find out the safety level and facilities of pedestrians. This study takes place within official and residential areas with high pedestrians mobility. Furthermore, traffic conflict analysis used as the method to measure the safety level of pedestrians. From the survey results, urban areas especially in study case is not equipped with safety facilities for pedestrians such as pedestrians crossing, road sign, mark, speed limit for vehicles, and 70% serious traffic conflict lead to potential accident which involving pedestrians. The result proves low safety level for pedestrians in urban area. As the recommendation, land use and innovation in pedestrians safety facilities installation is needed such as combination of zebra cross, speed limit, sign, mark, and speed hump to reduce vehicle speed when approaching the crossing facilities.Keywords: pedestrians safety, traffic conflict analysis Terdapat pengguna jalan lain yang memiliki angka keterlibatan yang tinggi sebagai korban kecelakaan, yaitu pengguna non kendaraan bermotor seperti pejalan kaki. Kajian ini mengenai tingkat pelayanan keselamatan dan fasilitas bagi pejalan kaki. Kajian ini mengambil lokasi wilayah perkantoran dan wilayah pemukiman dengan mobilitas pedestrian yang tinggi. Selanjutnya, digunakan analisis konflik lalu lintas sebagai metode pengukuran tingkat keselamatan responden. Dari hasil survey, kawasan perkotaan dalam studi kasus tidak difasilitasi dengan fasilitas keselamatan bagi pejalan kaki yaitu tidak adanya batasan kecepatan bagi kendaraan bermotor serta tetjadinya 70% konflik serius yang mengarah kepada potensi kecelakaan selama jam pengamatan yang melibatkan pejalan kaki. Diperlukan penanganan bagi keselamatan pejalan kaki yaitu pemanfaatan tata guna lahan dan pemasangan fasilitas keselamatan seperti zebra cross, pembatasan kecepatan, rambu, marka, dan speed hump untuk mengurangi kecepatan kendaraan bermotor yang akan melewati fasilitas penyeberangan. Kata Kunci: keselamatan, pejalan kaki, analisis konflik lalu lintas

Sign in / Sign up

Export Citation Format

Share Document