Link: https://en.wikipedia.org/wiki/Vehicle-to-everything

Vehicle-to-everything (V2X) describes wireless communication between a vehicle and any entity that may affect, or may be affected by, the vehicle. Sometimes called C-V2X, it is a vehicular communication system that is intended to improve road safety and traffic efficiency while reducing pollution and saving energy.

The automotive and communications industries, along with the U.S. government, European Union and South Korea are actively promoting V2X and C-V2X as potentially life-saving, pollution-reducing technologies. The U.S. Department of Transport has said V2X technologies offer significant transportation safety and mobility benefits. The U.S. NHTSA estimates a minimum of 13% reduction in traffic accidents if a V2V system were implemented, resulting in 439,000 fewer crashes per year. V2X technology is already being used in Europe and China.

Car parks that shuffle themselves to improve space efficiency.

Cars that drive in convoy, to improve efficiency.

Cars that are literally just trains.

Just build trains

They could just pull people over for speeding and tailgating that would reduce accidents a lot