FA-68057 / Traffic signal timing plans / Member archive

Shortway offset transition: the offset error is computed current minus target · case 02

Shortway offset transition returns a wrong result when the offset error is computed current minus target.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Input {cycle, current_offset, target_offset, lengthen_pct, shorten_pct}. The needed correction e = (target - current) mod cycle can be made by lengthening cycles by a total of e or shortening them by cycle - e. Per-cycle limits are floor(cycle*pct/100). Choose the direction needing fewer cycles (ties lengthen) and front-load the maximum adjustment each cycle. Return the list of transition cycle lengths ([] when already in step).

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 0	`[140, 140, 140, 130]`	`[140, 140, 130]`	Failed

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