There's no definitive answer to this question as it depends on a number of factors, including the weight of the passengers and cargo. However, we can take a look at some of the heaviest buses in the world to get an idea of just how big and heavy these vehicles can be.
One of the heaviest buses in the world is the Scania LBT 141, which weighs in at around 44 tonnes. This monster bus is used for long-distance haulage and can carry up to 150 passengers. Another heavyweight is the MAN Lion's Coach, which tips the scales at 42 tonnes. This bus is designed for luxury travel and can carry up to 79 people in comfort.
If we're talking about double-decker buses, then one of the heaviest is the Volvo B9TL, which weighs around 18 tonnes. This bus can carry up to 120 passengers and is often used in high-capacity urban areas such as London and Hong Kong.
So there you have it, some of the heaviest buses in the world! These massive vehicles are essential for transporting large numbers of people safely from A to B - just make sure you don't get stuck behind one on your daily commute!