Early morning commuters aren't facing any major delays along the Fix 50 construction zone on the first day of the final phase of the project.
Traffic has been moving along Highway 50, but it's expected to get messy.
The westbound Cap City Freeway connector ramp will be closed to traffic as well as the westbound Highway 50 off-ramp to 16th Street.
The northbound Highway 99 connector ramp to westbound 50 will be reduced to one lane.
Caltrans officials say this final phase could cause the worst delays and detour impacts.
Phase 2 of westbound work started last night as workers swapped open lanes from the outside lanes to the inside lanes. Phase 1 of westbound work finished about five days early.
The project is expected to be complete by June 25 at the latest.