New York City Transit Authority. Graphic Standards Manual by Massimo Vignelli

A concise, systematic manual that codifies a comprehensive visual identity for a large urban transit system, specifying typography, color palette, signage, maps, icons, and layout rules. It prescribes standardized dimensions, materials, and information hierarchy for station signs, schedules, and wayfinding elements to ensure legibility and consistency across the network. Renowned for its rigorous modernist approach and clear use of type and grid systems, the manual became a landmark reference in graphic design and transit wayfinding.