best combined flow+jam gain is +1.12187 +/- 0.00009 overall, and the best-performing condition is consistently density 0.32 with memory window 14; at anticipation fraction 0.0 the memory controller yields flow gains of +0.62740, +0.61955, and +0.61330 and jam drops of +0.50553, +0.50165, and +0.50545 for incident durations 0, 8, and 20 respectively, all with 95% CIs narrower than 0.00020 and 100% sign-consistency.
Memory heterogeneity is a genuinely large traffic-control effect in this incident setting. The striking result is that the best gain does not require anticipatory drivers; even with anticipation fixed at zero, a finite memory window sharply improves throughput and suppresses jams. That points to history-dependent local adaptation, not lookahead, as the dominant mechanism: drivers with heterogeneous memory smooth recurrent incident bottlenecks by retaining useful responses across events. Because the effect survives across incident durations with minimal variance, it looks like a robust operational lever rather than a brittle corner case.
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