The state Department of Transportation started restriping Monday night to create an additional lane on the H-1 Freeway.
In the westbound direction, restriping will be between the Punahou Street overpass and the Pali Highway overpass. In the eastbound direction, restriping will be between Ward Avenue and Keeaumoku Street.
As many as two lanes could be closed in each direction while the work is done.
The work is scheduled for Sunday though Thursday nights between 9 p.m. and 4 a.m. The work is scheduled to continue Friday and Saturday nights between 10 p.m. and 6 a.m.
The state is permanently reducing the speed limit to 45 mph and increasing its Freeway Service Patrol to improve driving conditions.
The project is costing $200,000. The state says this is far less expensive than widening the freeway.