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How do they control for situations where the sign is displaying a traffic alert that preempts the informational display? Presumably, if the sign is displaying
by hedora 3y ago
How do they control for situations where the sign is displaying a traffic alert that preempts the informational display?
Presumably, if the sign is displaying "congestion ahead" warnings, then traffic has often already slowed to a crawl, which could lead to a few percentage point decrease in crashes.
Also, unless the signs were placed poorly, they're likely in high-congestion areas, and frequently toggling between normal and congested display modes.
- spywaregorilla 3y agoSeems they're looking at the same areas across their analysis. That is, they always have signs. The question is whether the signs are specifically within the campaign period showing the crash number message.