Deciding the best order to make many deliveries, accounting for traffic, time windows and vehicle limits, is a famously hard problem. AI and optimisation software plan routes that cut distance and time, and adjust on the fly when conditions change during the day.
Better routing saves fuel and labour, reduces emissions and makes delivery estimates more reliable. The plans depend on good data about traffic and addresses, and drivers' real-world knowledge still matters for the last details, so the software works best as a strong starting plan that people can adapt, rather than an order to follow blindly.