The simulation that these cars are driving in has no third dimension for the vehicle to fall over into (or where to put another pair of wheels). So, like a trad

The simulation that these cars are driving in has no third dimension for the vehicle to fall over into (or where to put another pair of wheels). So, like a traditional four-wheeled car, these vehicles do not tip over at 0 velocity. I think that property is enough to qualify their behaviour as more similar to four-wheeled cars than motorbikes.