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. 2021 Feb 12;127:103328. doi: 10.1016/j.jue.2021.103328

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Fig. 4 — State-level LEX values by distance between states. Notes: This figure depicts average LEX values for pairs of states grouped by the distance between their population-weighted centroids. Each series depicts a 7-day moving average relative to its value on March 7, 2020. The Transportation Security Administration (TSA) throughput series reports the number of travelers passing through TSA checkpoints on each day. Monthly seasonally adjusted vehicle miles traveled comes from the Federal Highway Administration (series TRFVOLUSM227SFWA).