Spaces:
Running on Zero
Running on Zero
| class SafetyGate: | |
| """ | |
| Validates a proposed signal phase before execution. | |
| The Safety Gate does not choose the phase. | |
| It only decides whether the proposed phase is safe to execute. | |
| """ | |
| def __init__( | |
| self, | |
| min_green_seconds=10, | |
| yellow_seconds=3, | |
| all_red_seconds=1, | |
| confidence_threshold=0.50, | |
| risk_threshold=0.75, | |
| accident_probability_threshold=0.75 | |
| ): | |
| self.min_green_seconds = min_green_seconds | |
| self.yellow_seconds = yellow_seconds | |
| self.all_red_seconds = all_red_seconds | |
| self.confidence_threshold = confidence_threshold | |
| self.risk_threshold = risk_threshold | |
| self.accident_probability_threshold = accident_probability_threshold | |
| def validate( | |
| self, | |
| phase, | |
| topology_valid, | |
| conflict_free, | |
| timing_valid, | |
| pedestrian_clear, | |
| downstream_available, | |
| emergency_safe, | |
| confidence, | |
| safety_risk=0.0, | |
| accident_detected=False, | |
| safety_confidence=None | |
| ): | |
| """ | |
| Validate a proposed signal phase. | |
| Returns: | |
| { | |
| "approved": bool, | |
| "phase": phase, | |
| "checks": {...}, | |
| "reasons": [...] | |
| } | |
| """ | |
| checks = { | |
| "topology_valid": bool(topology_valid), | |
| "conflict_free": bool(conflict_free), | |
| "timing_valid": bool(timing_valid), | |
| "pedestrian_clear": bool(pedestrian_clear), | |
| "downstream_available": bool(downstream_available), | |
| "emergency_safe": bool(emergency_safe), | |
| "confidence_valid": ( | |
| confidence >= self.confidence_threshold | |
| ), | |
| "risk_valid": ( | |
| 0.0 <= safety_risk <= self.risk_threshold | |
| ), | |
| "accident_safe": not bool(accident_detected), | |
| } | |
| if safety_confidence is not None: | |
| checks["safety_confidence_valid"] = ( | |
| safety_confidence >= self.confidence_threshold | |
| ) | |
| reasons = [] | |
| for name, passed in checks.items(): | |
| if not passed: | |
| reasons.append(name) | |
| approved = len(reasons) == 0 | |
| return { | |
| "approved": approved, | |
| "phase": phase, | |
| "checks": checks, | |
| "reasons": reasons | |
| } |