Musk says Robotaxi doesn't run at night because the cameras struggle with "grey kittens on grey tarmac in the dark." The usual fix for that is lidar, which he's been calling a "fool's errand" since 2019.
electrek.co
Musk explains why Tesla Robotaxi is not running at night, and lidar is the answer
Elon Musk says Tesla Robotaxi is limited at night by pets that are hard to see. Lidar and radar handle that, and Tesla removed its radar in 2021.