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@inthehands @ajsadauskas I did a project that put variable speed limits on some highways to help flow. We created a traffic sim to see if it would work elsewhere. Used regression to tweak the driver behaviour model so they behaved as we saw drivers respond to the variable limits in the reality. Seemed work. Until one run, someone forgot to turn the signs on and the modelled drivers still acted just as well. We'd made sim'd drivers respond better to congestion, not to react to the signs. Doh!