- mile ▁stretch ▁of ▁Inter state ▁ 5 ▁between ▁Gra pe v ine ▁and ▁Cast a ic ▁is ▁sometimes ▁closed ▁by ▁the ▁California ▁Highway ▁Pat rol , ▁generally ▁because ▁of ▁the ▁ icy ▁conditions ▁combined ▁with ▁the ▁ste ep ▁grade ▁of ▁the ▁pass , ▁and ▁the ▁high ▁traffic ▁during ▁the ▁winter ▁hol id ays . ▁ ▁The ▁Highway ▁Pat rol ▁is ▁also ▁concerned , ▁especially ▁with ▁the ▁number ▁of ▁big - rig s ▁that ▁pass ▁through , ▁that ▁one ▁accident ▁in ▁the ▁snow y ▁conditions ▁might ▁force ▁traffic ▁to ▁slow ▁down ▁or ▁come ▁to ▁a ▁complete ▁stop , ▁leaving ▁hundreds ▁of ▁vehicles ▁st alled ▁at ▁once . ▁ ▁When ever ▁there ▁is ▁such ▁a ▁closure , ▁traffic ▁must ▁either ▁wait ▁for ▁it ▁to ▁re open , ▁or ▁end ure ▁a ▁multi - hour ▁det our ▁running ▁between ▁B akers field ▁and ▁Los ▁Angeles ▁ ▁via ▁CA ▁ 5 8 . ▁ ▁Commun ities ▁This ▁historic ▁gap ▁has ▁given ▁its ▁name ▁to ▁the ▁Mountain ▁Commun ities ▁of ▁the ▁Te jon ▁Pass . ▁ ▁Begin ning ▁on ▁the ▁south ▁at ▁Santa ▁Clar ita , ▁it ▁passes ▁through ▁Cast a ic , ▁G orm an , ▁and ▁Leb ec , ▁to ▁end ▁at ▁Gra pe v ine . ▁ ▁It ▁sk ir ts ▁the ▁Te jon ▁R anch , ▁where ▁two ▁large ▁planned ▁communities — Cent enn ial ▁and ▁Te jon ▁Mountain ▁Village — are ▁proposed . ▁ ▁See ▁also ▁Te h ach api ▁Pass , ▁used ▁by ▁the ▁rail ▁lines ▁connecting ▁southern ▁and ▁northern ▁California