The improvements being made on Highway 1 near Golden are on schedule but another full closure will start soon.
The section of highway will be closed from Sept. 26 until Dec. 1.
All through traffic on Highway 1 between Golden and Castle Junction will have to take a detour through Highway 93/95.
Provincial officials said the closure will allow crews to proceed with work that cannot be carried out safely during shorter interruptions.
The highway will temporarily reopen on the Thanksgiving holiday weekend from noon on Oct. 7 until noon on Oct. 11.
Roadside signs will provide advance notice of the closure.