What’s Melbourne’s busiest bus route?

Happy Bus Safety Week! Quick, what's the busiest bus route in Melbourne? Come Monday morning, the busiest bus route in the state will be in the southeastern suburbs -- with more passengers and buses serving it by a long shot. And it doesn't even have a route number. What is it? The Frankston line rail replacements from Moorabbin to Caulfield, over 37 days and nights from tonight at 9pm