From the 2020 series, the MBX Self-Driving Bus is part of the MBX City subseries.
This MBX Self-Driving Bus is not a vehicle I would normally buy, but was in completionist mode and wanted to go for a complete set of 2020 Matchbox vehicles. The vehicle itself features a die-cast lower half, painted white, while the top portion of the vehicle is a translucent blue plastic. It's a rather unique mold and I wonder how much use Mattel will get out of this one. When I look at this bus I'm reminded of the self-guided transports from the PS4 video game, Detroit Become Human (which is a fantastic, story driven game that I highly recommend!).
This is the first use of this mold.