When I read about the evils of drinking, I gave up reading!
If you Google "HIGH THREAT URBAN AREA" it will show you several explanations.
https://www.tsa.gov/sites/default/files/guidance-docs/high_threat_urban_area_htua_group_designations_0.pdf
https://railroads.dot.gov/elibrary/emergency-order-establishing-maximum-operating-speed-40-mph-high-threat-urban-areas
Ron
Ron
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