▁end , ▁the ▁main ▁line ▁of ▁M N ▁ 1 0 0 ▁mer ges ▁with ▁I - 6 9 4 ▁in ▁Brook lyn ▁Center . ▁The ▁route ▁is ▁ ▁in ▁length . ▁ ▁Route ▁description ▁M N ▁ 1 0 0 ▁serves ▁as ▁a ▁north – s outh ▁ar ter ial ▁route ▁in ▁the ▁western ▁sub ur bs ▁of ▁the ▁T win ▁C ities . ▁The ▁road way ▁serves ▁the ▁communities ▁of ▁Blo om ington , ▁Ed ina , ▁St . ▁Louis ▁Park , ▁Golden ▁Valley , ▁Cry stal , ▁Rob b ins dale ▁and ▁Brook lyn ▁Center . ▁M N ▁ 1 0 0 ▁is ▁constructed ▁to ▁fre ew ay ▁standards . ▁The ▁route ▁is ▁located ▁in ▁Hen ne pin ▁County . ▁ ▁History ▁ ▁Rout ing ▁as ▁a ▁bel t way ▁The ▁route ▁was ▁author ized ▁in ▁ 1 9 3 4 . ▁M N ▁ 1 0 0 ▁was ▁originally ▁meant ▁as ▁a ▁bel t way ▁around ▁the ▁T win ▁C ities ▁( pres umably ▁the ▁reason ▁for ▁the ▁round ▁number ) ▁and ▁actually ▁achieved ▁that ▁status ▁for ▁about ▁ 2 0 ▁years ▁in ▁the ▁mid - 2 0 th ▁century ▁( although ▁it ▁wasn ' t ▁a ▁full ▁fre ew ay ). ▁ ▁All ▁of ▁the ▁current ▁M N ▁ 1 0 0 ▁was ▁also ▁in ▁the ▁original ▁route . ▁Starting ▁from ▁the ▁current ▁southern ▁termin us , ▁Old ▁M N ▁ 1 0 0 ▁was ▁concurrent ▁east ward ▁with ▁a ▁pre - I - 4 9 4 ▁M