The teenager driving in the fatal Bethlehem College crash would not have been legally allowed to drive the HiAce which rolled in Kenya.
The Tauranga school admitted this week former student David Fellows, 18, was driving the van which crashed last month, killing four people.
Kenya's Traffic Act requires drivers of minibuses - known as "matatus" - to be at least 24 years old and have held a licence for cars or commercial vehicles for four years or more. A matatu is defined as a public service vehicle (PSV) having seating for up to 25 passengers.
Bethlehem College's board of trustees chairman Greg Hollister-Jones said he had "no idea" if the law was discussed before the fatal journey.
Traffic laws were the subject of a major publicity campaign in Kenya while the college group were there. Kenya Broadcasting Corporation deputy editor-in-chief Samuel Maina said Kenya's Ministry of Transport launched "a huge campaign" around mid-November in five major newspapers, five TV stations, and around 10 radio stations. "The issue of road carnage is a big issue in Kenya," Maina said.