Volvo’s electric EX90 will go on sale in 2024 with all the hardware required for L4 self-driving. The system’s linchpin is the first rooftop-mounted lidar unit on an international-market passenger vehicle—Luminar’s Iris. It’s a semi-solid-state system, which scans using larger macro mirrors rather than the micromirrors found in a MEMS configuration. Its light source is…