1 . ▁Between ▁ 1 9 7 0 ▁and ▁ 1 9 7 4 , ▁the ▁construction ▁of ▁PR   3 9 1 ▁from ▁Lyn n ▁Lake ▁to ▁Thompson . ▁ ▁Route ▁description ▁▁ ▁PR   3 9 1 ▁begins ▁at ▁the ▁at - grade ▁inter change ▁with ▁Bur nt wood ▁Road ▁as ▁a ▁divided ▁continu ation ▁of ▁Highway   6 ▁in ▁the ▁city ▁of ▁Thompson . ▁Kn own ▁as ▁Myst ery ▁Lake ▁Road , ▁PR   3 9 1 ▁becomes ▁the ▁major ▁ar ter ial ▁through ▁Thompson , ▁passing ▁the ▁Bur nt wood ▁Regional ▁Health ▁Author ity ▁Hospital . ▁The ▁route ▁b ends ▁north ▁through ▁Thompson , ▁passing ▁through ▁the ▁main ▁commercial ▁district ▁at ▁the ▁intersection ▁with ▁Thompson ▁Drive . ▁After ▁Thompson ▁Drive , ▁PR   3 9 1 ▁turns ▁n ortheast ▁and ▁leaves ▁the ▁city ▁center ▁of ▁Thompson , ▁crossing ▁over ▁Myst ery ▁Lake . ▁The ▁route ▁wind s ▁north ward ▁as ▁it ▁passes ▁the ▁Thompson ▁G olf ▁Club ▁and ▁reaches ▁the ▁access ▁road ▁to ▁Thompson ▁Municipal ▁Airport . ▁After ▁passing ▁south west ▁of ▁the ▁run ways , ▁PR   3 9 1 ▁reaches ▁a ▁j unction ▁with ▁the ▁western ▁termin us ▁of ▁PR   2 8 0 , ▁which ▁brings ▁people ▁to ▁Gill am . ▁ ▁After ▁PR   2 8 0 , ▁PR   3 9 1 ▁becomes ▁a ▁two - lane ▁gra vel ▁road ▁through ▁the ▁un in hab ited ▁port ions ▁of ▁northern ▁Man it oba . ▁The ▁route ▁runs ▁north west ▁and ▁west ▁for ▁various ▁points