The California Highway Patrol shut down all lanes of northbound traffic on Interstate 5 due to a stalled big rig for hours Tuesday for reports of a stalled big rig. 

According to the CHP dispatcher's website, a semi-truck was stalled, blocking the number four lane around 3:15 p.m. 

SIGALERT ISSSUED IN CASTAIC: NB I-5, NORTH OF CHP RD, #1/2/3/4 LANES WILL BE BLOCKED UNTIL FURTHER NOTICE DUE TO A STALLED BIG RIG

— CHP PIO - LA County (@CHPsouthern) December 26, 2017

Initial reports are that the truck was running out of gas and was blocking the number four lane. The driver tried to coast and ended up blocking all lanes. 

A Sig Alert was issued around 3:40 p.m. and was canceled around 6:30 p.m. 

Traffic remained slow in the area.