Surrogate safety laboratory

AV Traffic Conflict Simulator

Explore collision paths, time to collision (TTC), and post-encroachment time (PET).

AVLiDAR scanVehicleConflict zonePredicted minimum
No conflict predicted
100%
Select and drag a road user, conflict zone, device, or annotation.
Blue waves show the AV's animated LiDAR sensing field · Dashed lines show the actual movement route · 4 lanes · Lane width: 3.6 m · Simulation ends 0.75 m before a road user's front reaches the drawn roadway end · Crash motion is an illustrative 2D impact response

Post-collision review

Short Accident Analysis

Usage terms

License & Copyright

Copyright © 2026 Amin KeramatiAll rights reserved.

Ownership

This web application—including its source code, simulation logic, algorithms, visual design, documentation, and original content—is proprietary intellectual property of Amin Keramati, except for third-party components governed by their respective licenses.

Permitted use

You may access and use the hosted application for personal, educational, academic-research evaluation, and non-commercial demonstration purposes. You may share an authorized app link and cite the application as:

Keramati, Amin. AV Traffic Conflict Simulator (2026).

Restrictions

Without prior written permission from the copyright owner, you may not copy, reproduce, republish, redistribute, sell, sublicense, modify, reverse engineer, scrape or extract source code or substantial content, create derivative products, remove attribution or copyright notices, use the application to provide a paid service, or represent its results as certified safety findings.

Research and safety disclaimer

This application is an educational and research simulation tool. It is not a certified automated-driving system, engineering assessment, regulatory determination, legal opinion, or substitute for professional safety analysis. Results are illustrative and depend on user-selected assumptions. The application is provided “as is,” without warranties; use and interpretation remain the user’s responsibility.

For publication, commercial use, integration, redistribution, or other permissions, obtain prior written authorization from Amin Keramati.

Live analysis

Safety measures

Simulation incomplete
TIME TO COLLISIONNo predicted collisionPredicted collision: —
POST-ENCROACHMENT TIMEPendingAvailable after zone traversal
COLLISION STATUSNo collisionMinimum separation: —
AV position(−30.00, 0.00) m
Road-user position(0.00, −30.00) m
Center distance42.43 m
Distance to zone · AV / Other27.50 / 27.50 m
AV zone entry / exit— / —
Other zone entry / exit— / —
01

Two-dimensional TTC

Future oriented footprints are propagated with velocity and acceleration. TTC is the earliest future instant at which their rectangles intersect.

02

Event-based PET

PET is the gap from the first user completely leaving the shared zone to the second user entering it. Overlapping occupancy produces zero.

03

Anti-tunneling physics

Each visual frame is split into small adaptive physics steps, capped by object size and speed, with collision tests at every internal step.