▁Oak land ▁and ▁continues ▁north ▁as ▁the ▁Warren ▁Fre ew ay , ▁named ▁after ▁former ▁Al amed a ▁County ▁District ▁Att orney , ▁California ▁Governor ▁and ▁U . S . ▁Supreme ▁Court ▁Chief ▁Justice ▁Earl ▁Warren . ▁The ▁four - lane ▁fre ew ay ▁takes ▁a ▁largely ▁straight ▁path ▁as ▁it ▁runs ▁through ▁a ▁scen ic ▁valley . ▁This ▁valley ▁is ▁en closed ▁by ▁the ▁far ▁eastern ▁hills ▁of ▁Oak land ▁and ▁a ▁sh utter ▁r idge ▁that ▁has ▁been ▁driven ▁north west ward ▁along ▁the ▁Hay ward ▁F ault , ▁and ▁the ▁entire ▁fre ew ay ▁lies ▁within ▁the ▁earth qu ake ▁fault ▁zone ▁of ▁the ▁Hay ward ▁F ault . ▁In ▁the ▁event ▁of ▁a ▁major ▁earth qu ake ▁on ▁the ▁fault , ▁this ▁section ▁of ▁SR ▁ 1 3 ▁may ▁sust ain ▁heavy ▁damage . ▁N umer ous ▁over pass es ▁have ▁recently ▁under g one ▁extensive ▁se ism ic ▁retro f itting . ▁ ▁The ▁tall ▁trees ▁on ▁the ▁highway ' s ▁side ▁make ▁the ▁highway ▁appear ▁nar ro wer , ▁and ▁until ▁late ▁ 2 0 0 4 , ▁a ▁dense ▁group ▁of ▁trees ▁also ▁l ined ▁most ▁of ▁the ▁highway ' s ▁median . ▁For ▁most ▁of ▁the ▁day , ▁the ▁fre ew ay ▁experiences ▁only ▁mod est ▁traffic , ▁which ▁makes ▁it ▁a ▁speed y ▁by pass ▁around ▁dow nt own ▁Oak land . ▁ ▁Much ▁of ▁the ▁traffic ▁on ▁this ▁highway ▁comes ▁from ▁SR ▁ 2 4 ' s ▁comm ute ▁hour ▁con g estion