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Collapse Las Vegas Blvd NORTH from Sunset Rd to Spring Mountain Rd from 11:46:43 AM to 11:57:59 AM. Average speed: 20.2 mph. Total stops: 4 after the 1st intersection.Las Vegas Blvd NORTH from Sunset Rd to Spring Mountain Rd from 11:46:43 AM to 11:57:59 AM. Average speed: 20.2 mph. Total stops: 4 after the 1st intersection.