ative ▁route ▁numbers , ▁including ▁ 2 5 8 ▁from ▁Inter state ▁ 5 8 0 ▁to ▁present - day ▁SR ▁ 6 1 , ▁and ▁ 2 2 7 ▁from ▁Warren ▁Bou lev ard ▁to ▁U . S . ▁Route ▁ 5 0 . ▁This ▁latter ▁segment ▁was ▁not ▁finished ▁in ▁ 1 9 6 3 ▁and ▁only ▁existed ▁from ▁SR ▁ 2 4 ▁to ▁Jo aqu in ▁Miller ▁Road . ▁However , ▁the ▁finished ▁portion ▁along ▁Warren ▁Bou lev ard ▁was ▁commission ed ▁as ▁part ▁of ▁the ▁state ▁highway ▁system ▁in ▁ 1 9 4 7 . ▁ ▁The ▁portion ▁of ▁SR ▁ 1 3 ▁between ▁SR ▁ 2 4 ▁and ▁I - 8 0 ▁was ▁known ▁as ▁Sign ▁Route ▁ 2 4 ; ▁however , ▁it ▁was ▁legisl atively ▁designated ▁as ▁Route ▁ 2 0 6 ▁since ▁ 1 9 3 5 . ▁The ▁portion ▁between ▁I - 8 0 ▁and ▁SR ▁ 6 1 ▁was ▁also ▁part ▁of ▁Legisl ative ▁Route ▁ 2 0 6 ▁and ▁was ▁commission ed ▁into ▁the ▁state ▁highway ▁system ▁in ▁ 1 9 5 9 . ▁ ▁Route ▁ 1 3 ▁was ▁to ▁have ▁been ▁a ▁fre ew ay ▁by pass ▁of ▁Oak land ▁and ▁Ber keley ▁and ▁would ▁have ▁extended ▁south ▁from ▁its ▁present ▁end ▁to ▁the ▁N im itz ▁Fre ew ay ▁( Route ▁ 8 8 0 ). ▁State ▁law ▁describes ▁an ▁even ▁longer ▁Route ▁ 1 3 , ▁which ▁would ▁start ▁further ▁south ▁at ▁Route ▁ 6 1 ▁and ▁end