Roadworks on State Highway 2 between Masterton and Carterton backed up traffic for more than two kilometres yesterday morning.
Workers resealing the southbound passing lanes running from Norfolk Rd to East Taratahi Rd had left only a single lane in use about mid-morning and stop-go signs and police were at the site to manage the backlog.
The queue of north-bound traffic stretched for more than two kilometres about 10am with some drivers abandoning their places in line and heading back the way they came.
Mark Owen, New Zealand Transport Agency regional performance manager, said there had been work crews resealing the passing lane south of Masterton.
"We became aware that longer than expected delays were happening, so we acted quickly to get traffic flowing again. We did this by freeing up a lane via a contraflow arrangement to enable traffic to flow more smoothly, and this appears to have done the trick.