On both days, ramps could be shut down as early as 7 p.m. and all northbound lanes will be closed by midnight.
Crews are continuing the work that led to last summer's so-called "Carmageddon" event. They're building supports for the Mulholland Bridge.
The bridge's south side was torn down last summer. The overall project is scheduled for completion next year wth a price tag topping more than $1 billion.
