Waikato inspector Paul Carpenter said the exhibit was designed to generate discussions on issues such as rural road deaths, personal safety, drug activities on farms, stock thefts and illegal hunting.
Event organisers predicted 100,000 to 125,000 attendees over the next four days with Prime Minister John Key also expected to make an appearance.
Fieldays chief executive Jon Calder said last year's event brought in more than $400 million to the New Zealand economy.
"We are looking forward to a fantastic event, a lot of hard work has gone into it."
Waikato Regional Council's public transport operations manager, Andrew Wilson, encouraged visitors to make the most of buses.
"More people using public transport will help relieve congestion across the city," he said.
Free buses have been organised to run between Mystery Creek and the Hamilton Transport Centre.
Anyone with a Fieldays ticket can also travel on all Hamilton buses between June 10 and 13.