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Collapse Spring Mountain Rd WEST from Maryland Pkwy to Arville St from 1:39:57 PM to 1:52:38 PM. Average speed: 17.0 mph. Total stops: 6 after the 1st intersection.Spring Mountain Rd WEST from Maryland Pkwy to Arville St from 1:39:57 PM to 1:52:38 PM. Average speed: 17.0 mph. Total stops: 6 after the 1st intersection.