FA-68333 / Traffic signal timing plans / Member archive

Overlap phase indication: parents in red clearance are not treated as terminating · case 03

Overlap phase indication returns a wrong result when parents in red clearance are not treated as terminating.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Input {parents, not_during, state: [[phase, G|Y|RC|R]] for timing phases, next: phases to be served next}. The overlap is red while any not_during phase is green. Otherwise it is green while any parent is green. If a parent is terminating (Y or RC) the overlap stays green when any next phase is a parent; otherwise it is yellow if any terminating parent is in yellow, else red. Otherwise red.

Why this case matters

Signal timing arithmetic is exact and integer or rational; a wrong rule silently produces unsafe or inefficient timing plans.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
timing oracle 5	`"R"`	`"G"`	Failed

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