Fieldays gets under way at Mystery Creek in Hamilton this Wednesday - running through to Saturday - and the NZ Transport Agency is urging people to plan their journeys before they leave.
People using the State Highways around the Bay of Plenty and Waikato should allow extra time when travelling during the morning and evening.
The NZ Transport Agency highways manager, Karen Boyt, said pre-planning was essential if drivers wanted to enjoy safe travel and avoid delays.
"People should allow extra time when driving during Fieldays because of the increase in traffic on the roads and the fact that it's winter.
"In winter, weather and road conditions can change in a relatively short period of time so know before you go and regularly check while travelling if it's safe to do so."