TESLA ROADSTER PAIRS UNDERBODY SUCTION FANS WITH COLD-GAS THRUSTERS FOR GRIP BEYOND WHAT TIRES ALLOW

Summary from the TLDR Hardware newsletter

The Roadster's floor uses fans and perimeter seals to pull air out from under the car, creating up to 2 g of suction, enough to hold it upside down while stationary, and at speed, front and rear passages open for more flow. Cold-gas thrusters add a second system: ten nozzles fed by compressed air, with all-electric actuators for fast micro-adjustments, which Tesla says push with four to five times the force tires can deliver.