Smart infrastructure combines physical infrastructure and digital technologies to enable economic competitiveness, drive climate responsibility, and provide more equitable access to public transportation and services for all citizens. This combination—where silicon and software complement concrete and steel—more effectively meets the needs of our modern, information-driven economy today while enabling a path for upgrades over time as technology evolves. Smart infrastructure has the potential to foster unprecedented outcomes such as reduced traffic fatalities, a significant decrease in urban traffic congestion that could save billions of pounds of CO2 emissions [d:8953], and exponential economic growth.