State Highway 1 road renewal work started near Baldwin Rd in Lichfield on Monday and is expected to take three weeks.
The area will be under stop/go traffic management from 6am to 6pm, Monday to Friday, and there is a temporary speed limit of 30km/h past the work site.
Delays are expected, and road users should consider alternative routes between Putāruru and Tokoroa, says Waikato system manager at Waka Kotahi NZ Transport Agency, Cara Lauder.
"From past experience, we are aware that traffic can build up quickly in this area, and we highly recommend you check the Journey Planner (www.journeys.nzta.govt.nz) before leaving."
The work is the start of what promises to be a busy period for SH1 throughout Waikato.