Currently, level 4 lockdown does not allow automotive retail sales (motor vehicle sales through car dealerships). Car dealerships sales are currently classified under level 3.
Automotive manufacture is not sustainable without car dealership retail
If OEM’s open up plants and begin assembling cars without retail sales outlets being open in the form of car dealerships under COVID-19 social distancing. A build-up of supply in not being able to get vehicles to the consumer will result in parking lots of cars standing.
OEM manufacturers would surely not invest capital in new cars in a world where the cars made would merely stand in parking lots waiting for car dealerships to open their retail doors.