CAViAR: A Causal Video Dataset for Fine-Grained Accident Reasoning in Real-World Scenarios
Paper • 2608.19380 • Published
video_path stringlengths 5 5 | qa_pairs listlengths 5 10 |
|---|---|
00776 | [
{
"answer": "One night, a black vehicle going straight nearly collided with a white van changing lanes because the white van failed to yield to the car going straight, almost causing an accident.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct_index": -1,
"qu... |
00491 | [
{
"answer": "On a sunny day, a black off-road vehicle collided with a vehicle going straight. The cause of the accident was that the driver of the straight-going vehicle failed to maintain a safe distance, which led to the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer"... |
00989 | [
{
"answer": "On a clear day, a vehicle going straight nearly collided with a white pickup truck changing lanes because the pickup truck failed to yield to the straight-moving vehicle, almost causing an accident.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct_ind... |
00659 | [
{
"answer": "One night, a white car collided with a vehicle going straight. The cause of the accident was that the driver of the straight-going vehicle failed to observe the situation of the vehicles on the road when entering the main road, which led to the collision.",
"benchmark": "Dense Captioning",
... |
00960 | [
{
"answer": "On a clear day, a rear vehicle in the turning lane nearly collided with a dark gray sedan that had stopped to yield to pedestrians. The near-accident occurred because the following vehicle failed to maintain a safe distance from the car in front.",
"benchmark": "Dense Captioning",
"choices"... |
00478 | [
{
"answer": "On a rainy day, a white car collided with a vehicle going straight. The cause of the accident was that the driver of the white car changed lanes and drove against the traffic, which led to the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correc... |
00804 | [
{
"answer": "One night, a black car and another car almost collided. The cause of the accident may have been the black car suddenly changing lanes without maintaining a safe distance, which led to the close call.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct_in... |
00557 | [
{
"answer": "On a nighttime road, a vehicle going straight nearly collided with a gray SUV. The cause of the incident was the gray SUV driver failing to yield while changing lanes, which nearly resulted in an accident.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"corr... |
00433 | [
{
"answer": "On a sunny day, a vehicle traveling straight collided with a yellow truck. The cause of the accident was the yellow truck failing to observe the road conditions while turning and not using its turn signal, leading to the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"corr... |
00288 | [
{
"answer": "On a sunny day, a white car collided with a vehicle going straight. The cause of the accident was that the rear door of the white car was opened and it hit the vehicle going straight.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct_index": -1,
"q... |
00124 | [
{
"answer": "On a sunny day, a straight-going car collided with a white car. The cause of the accident was that the driver of the straight-going vehicle failed to maintain a safe distance, which led to the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correc... |
00040 | [
{
"answer": "On a clear day, a vehicle going straight collided with a white sedan from the cross lane when passing through a green light. The accident occurred because the white sedan ran a red light, resulting in the collision between the two vehicles.",
"benchmark": "Dense Captioning",
"choices": [],
... |
00566 | [
{
"answer": "On a clear day, a turning vehicle collided with a dark-colored SUV beside it. The accident occurred because the driver failed to check for coming traffic while turning, resulting in the collision between the two vehicles.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer... |
00449 | [
{
"answer": "On a clear day, a red vehicle making a turn collided with a white SUV that had stopped to yield in the adjacent lane. The cause of the accident was the red vehicle's failure to observe and ensure safety before proceeding, resulting in the collision between the two vehicles.",
"benchmark": "Dens... |
00835 | [
{
"answer": "One evening, a dark-colored vehicle traveling straight almost collided with a gray SUV that suddenly changed lanes. The accident occurred because the gray SUV changed lanes on a double solid line without checking the surrounding vehicles, causing the two cars to nearly collide.",
"benchmark": "... |
00071 | [
{
"answer": "On a sunny day, a white vehicle collided with a vehicle going straight. The cause of the accident was that the driver of the straight-going vehicle changed lanes without paying attention to the traffic conditions on the road, which led to the collision.",
"benchmark": "Dense Captioning",
"c... |
00098 | [
{
"answer": "On a sunny day, a vehicle going straight collided with a black car. The cause of the accident was that the driver of the straight-going vehicle failed to maintain a safe distance, which led to the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"co... |
00334 | [
{
"answer": "On a clear day, a black vehicle traveling straight collided with a dark gray sedan changing lanes. The accident occurred because the dark gray sedan failed to yield to the vehicle traveling straight while changing lanes, resulting in the collision between the two cars.",
"benchmark": "Dense Cap... |
00250 | [
{
"answer": "On a sunny morning, a straight-moving vehicle collided with a black sedan. The accident was caused by the straight-moving vehicle failing to maintain a safe following distance while driving in traffic.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct_... |
00668 | [
{
"answer": "One night, a vehicle going straight nearly collided with a white car. The possible reason is that the driver of the white car did not observe the situation of the vehicles behind when changing lanes.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct_in... |
00897 | [
{
"answer": "One evening, a vehicle going straight nearly collided with a red car changing lanes because the red car failed to yield to the straight-going vehicle, almost causing an accident.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct_index": -1,
"questi... |
00747 | [
{
"answer": "On a sunny day, a vehicle going straight nearly collided with a silver sedan changing lanes because the silver sedan failed to yield to the straight-moving vehicle, almost causing an accident.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct_index": -... |
00623 | [
{
"answer": "On a sunny day, a car going straight collided with a white truck. The cause of the accident was that the white truck failed to maintain a safe lateral distance and did not use its turn signal while making a turn, resulting in the collision.",
"benchmark": "Dense Captioning",
"choices": [],
... |
00013 | [
{
"answer": "On a clear day, a vehicle going straight collided with a dark gray sedan making a turn. The cause of the accident was the dark gray sedan failing to yield to the vehicle going straight while turning, resulting in the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_... |
00177 | [
{
"answer": "On a clear day, a turning vehicle collided with a dark gray vehicle going straight. The cause of the accident was the turning vehicle failing to yield to the vehicle going straight, resulting in a collision between the two cars.",
"benchmark": "Dense Captioning",
"choices": [],
"correct... |
00058 | [
{
"answer": "One rainy day, a light-colored car collided with a vehicle going straight. The cause of the accident was that the driver of the straight-going vehicle failed to maintain a safe distance, which led to the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
... |
00290 | [
{
"answer": "On a clear day, a black vehicle in the turning lane collided with a stationary black sedan. The accident occurred because the moving vehicle failed to maintain a safe distance from the car in front, resulting in the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_a... |
00460 | [
{
"answer": "One evening, a black car collided with a red car that was traveling in the same direction when starting up. The accident occurred because the red car failed to use its turn signal, and the black car did not carefully observe the road conditions to drive safely. Both parties violated traffic rules, ... |
00978 | [
{
"answer": "One night, a black vehicle going straight nearly collided with a dark gray SUV making a turn because the dark gray SUV failed to yield to the vehicle going straight, almost causing an accident.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct_index": ... |
00857 | [
{
"answer": "On a sunny day, a straight-going vehicle nearly collided with a black car. The possible reason is that the driver of the black car did not observe the traffic conditions on the road and did not use the turn signal when entering the main road.",
"benchmark": "Dense Captioning",
"choices": []... |
00787 | [
{
"answer": "On a clear day, a white vehicle going straight nearly collided with a black sedan turning ahead. The accident occurred because the straight-moving vehicle behind failed to maintain a safe distance from the car in front, nearly causing a rear-end collision.",
"benchmark": "Dense Captioning",
... |
00725 | [
{
"answer": "On a sunny day, a black vehicle and a straight-moving vehicle nearly collided. The cause of this incident may have been the sudden braking of the black sedan during its journey, leading to the near collision between the two cars.",
"benchmark": "Dense Captioning",
"choices": [],
"correc... |
00641 | [
{
"answer": "On a clear day, a straight-moving vehicle collided with a grey car. The cause of the accident was the straight-moving vehicle failing to maintain a safe following distance while passing through a slow-moving section, resulting in the collision.",
"benchmark": "Dense Captioning",
"choices": ... |
00991 | [
{
"answer": "On a nighttime road, a vehicle traveling straight nearly collided with a white pickup truck. The cause of the incident was the white pickup truck driver illegally crossing lanes, resulting in a near collision with the properly proceeding vehicle.",
"benchmark": "Dense Captioning",
"choices"... |
00356 | [
{
"answer": "One evening, a turning vehicle collided with a black sedan that was going straight through a green light. The cause of the accident was the turning vehicle failing to yield to the oncoming traffic, resulting in the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_an... |
00232 | [
{
"answer": "On a rainy day, a black vehicle running a red light collided with a silver sedan traveling straight in the perpendicular lane. The cause of the accident was the black vehicle running the red light, resulting in the collision between the two cars.",
"benchmark": "Dense Captioning",
"choices"... |
00670 | [
{
"answer": "On a sunny day, a black car changing lanes nearly collided with a dark gray SUV traveling straight, because the black car failed to yield to the coming vehicle while changing lanes, almost causing an accident.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"... |
00714 | [
{
"answer": "One night, a straight-going vehicle nearly collided with a dark-colored car. It might have been because the driver of the dark-colored car did not observe the traffic conditions on the road when entering the main road and did not use the turn signal.",
"benchmark": "Dense Captioning",
"choi... |
00597 | [
{
"answer": "On a clear day, a vehicle traveling straight nearly collided with a truck in front. The cause of the incident was that the rear vehicle failed to maintain a safe distance from the vehicle ahead, nearly resulting in a rear-end collision.",
"benchmark": "Dense Captioning",
"choices": [],
... |
01012 | [
{
"answer": "At night on the road, a vehicle traveling straight collided with a gray SUV. The cause of the accident was the gray SUV driver failing to pay attention to road conditions and nearby vehicles while changing lanes, resulting in a collision with the vehicle traveling normally in its lane.",
"bench... |
00022 | [
{
"answer": "On a clear day, a dark-colored car collided with a black sedan. The accident occurred because the driver of the black sedan failed to observe the road conditions while changing lanes and did not use the turn signal, leading to the collision.",
"benchmark": "Dense Captioning",
"choices": [],... |
00902 | [
{
"answer": "On a sunny day, a straight-going vehicle nearly collided with a dark off-road vehicle. It might be because the driver of the dark off-road vehicle did not yield to the vehicles going straight when turning and did not use the turn signal.",
"benchmark": "Dense Captioning",
"choices": [],
... |
00866 | [
{
"answer": "One night, a vehicle going straight collided with a black car making a turn. The accident was caused by the black car failing to signal when turning and illegally changing lanes by crossing solid lines.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct... |
00949 | [
{
"answer": "On a sunny day, a car going straight nearly collided with a dark gray car. It might be because the driver of the dark gray vehicle failed to pay attention to the situation of the vehicles behind when changing lanes.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",... |
00699 | [
{
"answer": "One night, a white car collided with another car. The cause of this incident was that the white car tried to overtake and change lanes while driving and almost hit an adjacent vehicle.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct_index": -1,
"... |
00831 | [
{
"answer": "On a clear day, a vehicle going straight nearly collided with a red car changing lanes because the red car failed to yield to the straight-moving vehicle, almost causing an accident.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct_index": -1,
"qu... |
00955 | [
{
"answer": "On a sunny day, a car going straight almost collided with a dark-colored car that was turning. The accident occurred because the dark-colored car failed to observe the straight-moving vehicle's path before turning, violating the rule that turning vehicles must yield to vehicles going straight, whic... |
00529 | [
{
"answer": "On a clear day, a black vehicle traveling straight collided with a silver vehicle changing lanes. The cause of the accident was the silver vehicle failing to yield to the straight-moving vehicle while changing lanes, resulting in the collision.",
"benchmark": "Dense Captioning",
"choices": ... |
00406 | [
{
"answer": "On a rainy day, a turning vehicle collided with a silver sedan. The accident occurred because the silver sedan ran a red light, and the turning vehicle was unable to avoid it in time, resulting in the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
... |
00562 | [
{
"answer": "On a cloudy day, a vehicle traveling straight collided with a colored car. The cause of the accident was that the driver of the colored vehicle failed to yield to the vehicles going straight when entering the main road, which led to the collision.",
"benchmark": "Dense Captioning",
"choices... |
00392 | [
{
"answer": "On a sunny day, a vehicle going straight collided with a small white truck. The cause of the accident was that the vehicle going straight ran a red light while driving at an excessive speed, resulting in the collision between the two vehicles.",
"benchmark": "Dense Captioning",
"choices": [... |
00111 | [
{
"answer": "On a sunny day, a vehicle going straight collided with a black car. The cause of the accident was that the driver of the straight-going vehicle failed to maintain a safe distance, which led to the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"co... |
00330 | [
{
"answer": "On one evening, a black vehicle proceeding straight through a green light collided with a dark gray SUV in the intersecting lane. The cause of the accident was the dark gray SUV running a red light, resulting in the collision with the vehicle going straight.",
"benchmark": "Dense Captioning",
... |
00254 | [
{
"answer": "On a night, a straight-moving vehicle collided with a white blue SUV. The accident occurred because the light-colored SUV failed to activate its turn signal while making a turn and did not maintain a safe lateral distance, leading to the collision.",
"benchmark": "Dense Captioning",
"choice... |
00627 | [
{
"answer": "On a clear day, a vehicle going straight nearly collided with a black sedan changing lanes because the black sedan failed to yield to the straight-going vehicle and did not turn on its signal light before changing lanes, nearly causing an accident.",
"benchmark": "Dense Captioning",
"choice... |
00265 | [
{
"answer": "On a clear day, a vehicle traveling straight collided with a white pickup truck in front of it. The cause of the accident was that the rear vehicle failed to maintain a safe distance from the vehicle ahead, resulting in a rear-end collision.",
"benchmark": "Dense Captioning",
"choices": [],... |
00301 | [
{
"answer": "On a clear day, a vehicle going straight collided with a black sedan changing lanes. The accident occurred because the black sedan failed to yield to the vehicle going straight and did not use its turn signal, resulting in the collision.",
"benchmark": "Dense Captioning",
"choices": [],
... |
00495 | [
{
"answer": "On a sunny day, a white car collided with a black vehicle. The cause of the accident was that the driver of the black vehicle failed to maintain a safe distance, which led to the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct_index": -1,
... |
00739 | [
{
"answer": "One evening, a silver car and a straight car almost collided. The cause of the accident was that the silver car tried to change lanes while driving and failed to pay attention to the straight car next to it, which led to a near collision between the two cars.",
"benchmark": "Dense Captioning",
... |
00553 | [
{
"answer": "One night, a silver car collided with a straight car. The accident happened because the straight car ran a red light when passing through the intersection, and the speed was relatively fast, and it hit the silver car that was turning.",
"benchmark": "Dense Captioning",
"choices": [],
"c... |
00437 | [
{
"answer": "One night, a black SUV collided with a vehicle going straight. The cause of the accident was that the driver of the straight-going vehicle failed to maintain a safe distance, which led to the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct... |
00964 | [
{
"answer": "On a cloudy day, a black vehicle crossing the line nearly collided with a silver MPV driving straight. The incident occurred because the black vehicle crossed the line and failed to maintain a safe distance from the car in front, almost causing an accident.",
"benchmark": "Dense Captioning",
... |
00044 | [
{
"answer": "On a cloudy day, a dark gray vehicle traveling straight collided with a black SUV in the transverse lane. The accident occurred because the black SUV failed to stop and check for safety at the intersection, resulting in the collision between the two vehicles.",
"benchmark": "Dense Captioning",
... |
00593 | [
{
"answer": "On a rainy day, a dark-colored vehicle traveling straight nearly collided with a white truck turning right ahead. The accident occurred because the driver of the rear vehicle failed to maintain a safe distance from the truck turning right at the intersection, causing the two vehicles to nearly coll... |
00674 | [
{
"answer": "On a night, a straight-moving vehicle collided with a black sedan. The cause of the accident was that the straight-moving vehicle failed to slow down at the ramp entrance and crossed the solid line, leading to the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_ans... |
00710 | [
{
"answer": "One night, a white vehicle nearly collided with a vehicle going straight. It might have been because the driver of the straight-going vehicle did not maintain a safe distance.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct_index": -1,
"question"... |
01016 | [
{
"answer": "One night, a white vehicle traveling straight nearly collided with a black sedan that changed lanes at a solid line and then turned. The near-accident occurred because the black sedan failed to yield to the straight-moving vehicle while changing lanes at the solid line.",
"benchmark": "Dense Ca... |
00328 | [
{
"answer": "One night, a black vehicle collided with a silver vehicle. The accident occurred because the silver vehicle changed lanes without signaling and illegally crossed a solid line, leading to the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct_answer": "",
"correct_... |
00084 | [
{
"answer": "One rainy day, a black vehicle collided with a turning vehicle. The cause of the accident was that the driver of the black vehicle entered the main road without observing the traffic on the main road, which led to the collision.",
"benchmark": "Dense Captioning",
"choices": [],
"correct... |
00207 | [
{
"answer": "On a sunny day, a straight car collided with a silver car. The cause of the accident was that the driver of the silver car failed to yield to the vehicles on the main road when starting and entering the main road, which led to the collision.",
"benchmark": "Dense Captioning",
"choices": [],... |
00363 | [
{
"answer": "On a clear day, a straight-moving car rear-ended a red SUV. The accident occurred because the straight-moving car failed to maintain a safe distance from the red SUV while queuing to pass, leading to the collision due to inattentive driving.",
"benchmark": "Dense Captioning",
"choices": [],... |
End of preview. Expand in Data Studio
CAViAR (val / test)
Causal Accident Video and Incident Analysis Repository — Nexar validation/test annotations.
This Hub dataset mirrors the public val/test split from github.com/nec-labs-ma/CAViAR: 749 videos, 7,407 QA pairs. Videos are not included.
video_path is the numeric Nexar clip id (e.g. 00284). Source videos: nexar-ai/nexar_collision_prediction ({id}.mp4 under train/ / test-public/ / test-private/).
Paper: CAViAR: A Causal Video Dataset for Fine-Grained Accident Reasoning in Real-World Scenarios (arXiv:2608.19380).
Load
from datasets import load_dataset
ds = load_dataset("sparshgarg57/CAViAR", split="test")
print(ds[0]["video_path"], len(ds[0]["qa_pairs"])) # e.g. "00776", 10
Canonical JSON (same as GitHub): data/test.json.
Split
| Split | Source | Role | Released here |
|---|---|---|---|
| Train | CCD | Fine-tuning | No |
| Val / test | nexar-ai/nexar_collision_prediction | Held-out evaluation | Yes (annotations only) |
Tasks
benchmark |
Type |
|---|---|
| Dense Captioning | Open |
| Weather & Light | MCQ |
| Road Conditions | MCQ |
| Accident Type | MCQ |
| Faulter Identification | Open (apparent at-fault agent) |
| Victim Identification | Open (affected agent) |
| Violation Identification | Open |
| Accident Reason | Open |
MCQ items include choices, correct_answer, and correct_index. Open-ended items leave those empty (correct_index = -1).
Videos
Download from nexar-ai/nexar_collision_prediction (Nexar Open Data License). Join on id:
CAViAR video_path |
Nexar file |
|---|---|
00284 |
00284.mp4 |
huggingface-cli download nexar-ai/nexar_collision_prediction --repo-type dataset --local-dir /path/to/nexar_collision_prediction
export CAVIAR_VIDEO_ROOT=/path/to/nexar_collision_prediction
Eval scripts search train/, test-public/, and test-private/ for {id}.mp4. Code: CAViAR GitHub.
Example clip (00284, T-bone):
Short collision-window preview only; the Nexar corpus is not redistributed here.
License and ethics
Annotations are for academic research on accident understanding and rule-relevant multimodal reasoning. Raw Nexar videos remain under the Nexar Open Data License; CCD videos remain under their original license.
Labels are apparent responsibility cues from video evidence. They are not legal determinations of liability and must not be used for adjudication, insurance, enforcement, or decisions about identifiable individuals.
Citation
@article{garg2026caviar,
title={CAViAR: A Causal Video Dataset for Fine-Grained Accident Reasoning in Real-World Scenarios},
author={Garg, Sparsh and Chen, Yi-Wen and Aich, Abhishek and others},
journal={arXiv preprint arXiv:2608.19380},
year={2026}
}
Please also cite Nexar when using the val/test videos:
@misc{nexar2025dashcamcollisionprediction,
title={Nexar Dashcam Collision Prediction Dataset and Challenge},
author={Daniel C. Moura and Shizhan Zhu and Orly Zvitia},
year={2025},
eprint={2503.03848},
archivePrefix={arXiv},
primaryClass={cs.CV},
url={https://arxiv.org/abs/2503.03848}
}
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