Trikes and quads might share characteristics with bicycles, but they’re not bicycles because they don’t have two wheels.
“a vehicle with two wheels tandem”
“a two-wheeled vehicle that you sit on”
“a vehicle with two wheels in tandem”
“Bicycle is a two-wheeled vehicle powered by the rider”
“bicycle, two-wheeled steerable machine that is pedaled by the rider’s feet”
“a bicycle, a bike: a two-wheeled vehicle moved by pressing down on pedals with your feet”
Sometimes you could argue that there’s a grey area between a moped and a bicycle, or an e-bike and a bicycle. But, the two wheels is a key part of the definition. As soon as it’s more (or less) than two permanently attached wheels, it’s no longer a bicycle. That’s why we have words like unicycle, tricycle, etc.








The description of the vehicle is:
“Image: A four-wheeled vehicle that appears to be a cross between a bicycle, a go-cart, and a mini-truck”
There’s really nothing about that vehicle that’s bicycle-like. First of all, it has more than 2 wheels, so it’s not a bicycle. In addition, you don’t move it by pedalling. You also sit inside it, not on it.
It’s really more of a cross between a golf cart and a delivery truck. It might legally get through loopholes meant for bicycles, but there’s nothing about it that looks bicycle-like.