Freeways have several lanes in each direction. On freeways, you should leave the extreme left lane for faster traffic or to pass slow moving vehicles. The right lane should be used for traffic that paces more slowly than the normal traffic flow.
Always choose a lane that has a clear view and is appropriate for your speed. Avoid driving in the right lane as there will be a lot of merging traffic at freeway entrances and your view will be blocked by slower larger vehicles like buses, trucks, RVs, etc.
Remember, lane weaving is always dangerous, annoys other drivers, increases the risk of collisions, and doesn't save time.