Automated Defensive Driving System

The Infrastructure for
AV Behavior Design

ADD is not a rulebook. It is the engine that lets your team write, validate, and deploy your own driving rules — at any scale, for any region, without retraining a model.

Your ODD. Your traffic laws. Your brand behavior. — ADD gives your engineering team the tools to express and enforce them — white-box, auditable, hot-swappable.

Out-of-the-box demo library — what ships on day one

184
Starter Rules
2,262
Test Items · All Green
0.03ms
End-to-End Latency
10
Reference Scenarios
Scenarios You Can Build
What ADD Actually Is

A Behavior Editor,
Not a Rule Package

Real-world driving has infinitely many scenarios. Any fixed rulebook — no matter how large — will always fall short. ADD solves this at a different level.

ADD gives your engineering team the language, toolchain, and runtime to express any driving behavior as explicit, verifiable rules — and deploy it without retraining a model.

The 184 starter rules and 10 reference scenarios are a proof-of-concept demo. The product is the infrastructure beneath them.

You own the rules
Write rules in plain YAML. Express your brand's driving style, your target region's laws, your ODD's edge cases — without touching model weights.
You own the scenarios
Use ADD Studio's scenario editor to define, validate, and regression-test any driving situation your programme requires — with a full acceptance suite per scenario.
You own the behavior policy
Hot-swap jurisdictions, tune aggression levels, roll back any change at runtime — without returning to your supplier or scheduling a retraining cycle.
LF🚗Left Front
CF🚘Center Front
RF🚗Right Front
LCLeft Close
EGO🏎Ego Vehicle
RC🚙Right Close
LR🚐Left Rear
CR🚌Center Rear
RR🚗Right Rear
VS-07 · LC zone threat detected — two-hop cascade inference active · lane change suppressed
VS-07 · Highway Nine-Grid

Two-Hop Cascade Threat Inference

Vehicle A-IV's trajectory compresses B-III, which in turn threatens Ego. ADD detects this indirect threat chain and suppresses the lane change — without waiting for direct contact risk.

Click any zone to inspect its live threat status and the rule that fired.

  • Attention allocation — each scenario activates a different perceptual bridge
  • Relationship-based reasoning, not raw numeric thresholds
  • Every decision outputs a full rule_id causal chain
Reference Scenario Library

10 Scenarios Shipped.
Unlimited Scenarios Possible.

These 10 scenarios demonstrate ADD's range — from simple reflex rules to multi-vehicle game theory to semantic reasoning. They are a starting point, not a ceiling. Your team extends the library using the same toolchain.

VS-01

Four-Car Unordered Intersection

Who goes first? Symmetry-breaking for simultaneous arrival, multi-vehicle priority arbitration.

6/6 cases PASS
VS-02

CN / UK Traffic Law Divergence

Same intersection, different outcomes. Jurisdiction hot-swap — zero retraining required.

8/8 cases PASS
VS-03

Incident Responsibility Tracing

Full ISO 26262 causal chain output — 100ms to reproduce any past decision with complete rule_id sequence.

6/6 cases PASS
VS-04

Rain-Night Vulnerable Road User

Rain × pedestrian × wheelchair — three conditions firing simultaneously. SWRL/OWL semantic reasoning layer.

7/7 cases PASS
VS-05

Dual-AV Deadlock

Two AVs face-to-face, both yielding indefinitely. Hash-parity tie-breaking resolves the paradox.

3/3 cases PASS
VS-06

Railway Level Crossing

Barrier state determines action. Safety-layer rule — cannot be overridden by any lower-priority rule.

8/8 cases PASS
VS-07

Highway Nine-Grid

Blocked front, rear, and left simultaneously. Two-hop indirect threat cascade inference.

7/7 cases PASS
VS-08 – 10

Extended Scenario Library

Heavy truck rules, additional edge cases, and client-specific custom scenarios built on the same framework.

14/14 cases PASS
Why ADD

Infrastructure-Grade
Advantages

01

You Control the Behavior

Rules are plain YAML — readable, editable, versionable by your own engineers. No supplier dependency for policy changes. Your ODD, your regional laws, your brand's driving character — expressed and enforced directly.

02

White-Box by Design

Every decision is the output of explicit, auditable rules — not opaque neural weights. Full causal chain on every output. ISO 26262 ASIL-B responsibility tracing at 0.18ms. Engineers can read and certify each rule path.

03

Hot-Swap at Runtime

Rule modules are versioned and swappable without system restart. Switch jurisdictions in 0.08ms. Update driving policy at software pace — not hardware revalidation cycles. Roll back any change instantly.

04

E2E Compatible

ADD replaces only the Safety Check layer in a conventional E2E pipeline — adding white-box auditability while preserving the planning layer's implicit generalisation. Compatible with your existing architecture from day one.

Next Step

See ADD Studio running
on your scenarios.