Some also got a chance to try out the simulator, which allows them to take a virtual drive on the highway - although not without a few spills.
Waka Kotahi also included a display of plants, which would be planted along the highway in order to mitigate its effects on the environment.
More than 530,000 native plants will be placed over the next few months as part of the project's ecological offset programme.
Almost 2 million will be planted at several locations throughout the region during the project.
In May, the team working on the project celebrated the milestone of moving the 3 millionth cubic metre of earth since construction began in January last year.
A total of 6 million cubic metres will be moved.
A public information session was also held at the Waka Kotahi site office in Ashhurst on Wednesday, and a third is in Woodville on Thursday.