Tesla has ramped up drone restrictions at its Giga Shanghai plant, possibly to protect details about its Project Highland Model 3 refresh. The new measures coincide with the start of Model 3 refresh production earlier in June, during Elon Musk's first visit to China in three years. Drone pilot Wu Wa reports the expansion of the control area around the factory and a flight height limit of 30 meters, making the factory virtually unapproachable. He suggests these measures exceed typical drone control measures in China and were approved by local government. Tesla has been quiet about the Model 3 refresh, which is not merely aesthetic but a complete overhaul. It is expected to be released in late summer or early fall.