1 8 8 ▁was ▁designated ▁on ▁October ▁ 3 1 , ▁ 1 9 5 8 . ▁The ▁highway ▁officially ▁became ▁U R ▁ 1 8 8 ▁in ▁ 1 9 9 5 . ▁On ▁November ▁ 1 5 , ▁ 2 0 1 8 , ▁the ▁entire ▁route ▁was ▁changed ▁back ▁to ▁FM ▁ 1 8 8 . ▁ ▁Major ▁inter sections ▁ ▁See ▁also ▁ ▁References ▁▁ 0 1 8 8 ▁Category : Transport ation ▁in ▁Gal vest on , ▁Texas ▁Category : Transport ation ▁in ▁Gal vest on ▁County , ▁Texas <0x0A> </s> ▁Su z anne ▁Sim ard ▁is ▁a ▁professor ▁of ▁forest ▁e col ogy ▁and ▁teach es ▁at ▁the ▁University ▁of ▁British ▁Columbia . ▁ ▁She ▁is ▁a ▁bi ologist ▁and ▁has ▁tested ▁theories ▁about ▁how ▁trees ▁communicate ▁with ▁other ▁trees . ▁ ▁She ▁used ▁radio active ▁carbon ▁to ▁measure ▁the ▁flow ▁and ▁sharing ▁of ▁carbon ▁between ▁individual ▁trees ▁and ▁species , ▁and ▁discovered ▁that ▁bir ch ▁and ▁Douglas ▁fir ▁share ▁carbon . ▁ ▁Bir ch ▁trees ▁receive ▁extra ▁carbon ▁from ▁Douglas ▁f irs ▁when ▁the ▁bir ch ▁trees ▁lose ▁their ▁leaves , ▁and ▁bir ch ▁trees ▁supply ▁carbon ▁to ▁Douglas ▁fir ▁trees ▁that ▁are ▁in ▁the ▁sh ade . ▁ ▁Mother ▁Tre es ▁Sim ard ▁helped ▁identify ▁something ▁called ▁a ▁hub ▁tree , ▁or ▁“ m other ▁tree ”. ▁Mother ▁trees ▁are ▁the ▁largest ▁trees ▁in ▁for ests ▁that ▁act ▁as ▁central ▁hub s ▁for ▁vast ▁below - ground ▁my cor rh iz al ▁networks . ▁