Refers to a vehicle type such as: high floor, low floor, over-the-road coach, vans, or an articulated bus. Bus class can also refer to size (i.e., 30-foot, 60-foot, etc.).

• Small Transit Bus (STB) – Under 30 feet
• Medium Transit Bus (MTB) – 30 to 34 feet
• Large Transit Bus (LTB) – 35 feet and up
• Trolley – Usually 30 to 35 feet
• Articulated (ART) – Multi-section high occupancy vehicle