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Directional collective next stop: reversal call choice · case 04

The car reverses at the nearest down call and leaves higher down calls waiting.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

A car stopped at floor with direction up, down or idle chooses its next stop. Travelling up it stops at the nearest car call or up hall call above; failing that it runs to the highest down hall call above; failing that it reverses and applies the mirrored rule downwards (nearest car call or down call below, else lowest up call below). An idle car heads towards the nearest call other than its own floor (ties to the lower floor). Returns [floor, travel direction] or [None, idle].

Why this case matters

Lift group controllers make these decisions many times per minute; a wrong answer strands passengers, wastes trips or overrides a safety rule.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: highest down call is the reversal	`[4, "up"]`	`[9, "up"]`	Failed

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