This design uses primary colors to deliver its purpose. When I saw this design, I was immediately drawn to its color scheme. I think primary colors make up one of the most powerful color schemes, thus making them a huge tool for me as a designer.
Take a Look Inside Massimo Vignelli’s Famous 1972 Subway Map. Urban enthusiasts mourned the death of Massimo Vignelli, the graphic designer who created the iconic 1972 NYC subway map. Here's a look at that famous map.