Knowledge Universe on Instagram: "Apple Maps walking time estimates are accurate because they are trained on real human behavior, not simple distance formulas. The system analyzes anonymized GPS data from millions of shared walks, factoring in elevation, crossings, terrain, and natural pauses. Machine learning models then build a realistic “average pace” that reflects how people actually move through cities. This approach turns everyday navigation into a continuously improving prediction system,

Pushdown Automata (Introduction)