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The infamous Port Mine Access Road commanded respect and focus to survive.  Many didn't.
Technical Specs : 2 lane 24ft wide.  16 miles long, 9 miles valley, 7 miles mountain section.  Design speeds:  valley 50mph, mountain 30mph [20mph on difficult sections],  ruling grade 12%, max elevation 3300ft.
Record time from Arawa Post Office to Panguna Pink Palace  16mins.  Tony McDonald [260z] and 'Phantom' [240z 24valve] 1975.