In the summer of 1924 as Hull's assistant, Vint met with NPS Director Stephen Mather, Chief Engineer George Goodwin and Park Superintendent Charles Kraebel near Logan Pass in Glacier National Park to review and discuss the route of the proposed Transmountain Highway through the park. Goodwin proposed a route involving 15 switchbacks and grades up to 8% ascending up the Logan Creek drainage to the pass. Vint decried Goodwin's route saying it would look "like miners had been there." Drawing on his training as a landscape architect, Vint instead proposed a simple route of one switchback with a gently rising grade of 6% that would meet the NPS goal of “lying lightly on the land.” After that meeting Mather consulted with Bureau of Public Roads (BPR) engineer Bill Austin and others as to which route should be selected. All agreed that while Vint's route would be more expensive it would more closely meet the NPS policies of preserving the scenic landscape. The result is the now famous Going-to-the-Sun Road, completed in 1932, that is enjoyed by millions of visitors. As another important result of this process the NPS and BPR (now Federal Highway Administration) entered into a collaboration that set a policy for all future National Park Service Roads.