From 2000 to 2022, the population of Istanbul grew by 50%. The increase has caused significant traffic problems, especially in the old part of the city where there are shopping centers, business centers, as well as a stadium. The city needed to efficiently expand its public transportation system to improve the traveler experience, ensuring citizens are transported from the surface to the platform in a short time, comfortably, and in a sustainable way. Metro Istanbul initiated the Seyrantepe – Alibeyköy pocket bus station metro project, which has three stations across 6.9 kilometers and can serve of 70,000 passengers per hour. Using LEGION, project planners simulated how passengers would use the stations and optimized their design to avoid bottlenecks and prepare evacuation scenarios during emergencies. The final design will keep passengers moving through 2050 and alleviate congestion through a sustainable mode of transportation.