North Yorkshire Council says the new stretch of the A59 at Kex Gil, west of Harrogate, is on track to open this June.
Work on a natural stone retaining wall at the west end of the scheme, alongside the installation of a culvert at North Moor Road, is underway.
This will take water under the new road and into Hall Beck.
Work has continued to backfill the large underpass visible from the old road, which will then be followed by cladding the concrete walls with natural stone.
Drainage works are being carried out for the new carriageway, while waterproofing works continue on the bridge deck at Blubberhouses Bridge.
Tree planting and grass seeding with a wildflower mix have also started too.
Some temporary restrictions will be in place:
• North Moor Road is closed for eight weeks at the junction with the A59 from 2 March
• Two-way traffic at the same junction of North Moor Road and the A59 for eight weeks from 2 March
• Two-way traffic lights at Blubberhouses Bridge on the A59 until mid-May
• Church Hill will be closed at the junction with the A59 for eight weeks, currently scheduled for early May
• Overnight road closures will be needed towards the end of the scheme for final surfacing
