Index Of Rush Hour Hot ^new^ -

: Residents use these indices to compare local congestion against national averages (e.g., Richmond's 2025 data).

The intersection of peak commuting periods (rush hour) and urban heat exposure represents a critical yet under-examined public health and infrastructure challenge. While existing metrics measure ambient temperature (Heat Index) or traffic congestion (Volume/Capacity ratio), no singular index captures the synergistic stressors of vehicular emissions, delayed exposure time, and radiant heat within micro-urban canyons. This paper proposes a novel , defined as a weighted composite of four sub-indices: Ambient Thermal Load (ATL), Radiant Surface Emission (RSE), Idling Emissions Exposure (IEE), and Pedestrian Density Stress (PDS). Using a case study methodology in three distinct urban morphologies (dense downtown, transit corridor, open suburban park-and-ride), we validate the RHI against commuter physiological data (skin temperature, heart rate variability). Findings indicate that the RHI peaks 15–20 minutes after the traditional rush hour vehicle peak due to asphalt heat lag, suggesting that current "peak window" alerts underestimate thermal risk by up to 34%. The paper concludes with policy recommendations for adaptive traffic light phasing and shade infrastructure deployment based on real-time RHI values. index of rush hour hot

End of Paper

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