Outside of the designated operational hours indicated on a dedicated bus lane sign (e.g., during off-peak midday or late night), how is traffic permitted to use that lane?

1. The lane is completely closed to all vehicular traffic including buses
2. Only non-motorized bicycles and electric scooters may use the lane
3. Only emergency ambulances may enter the lane at any time
4. Other social motor vehicles are permitted to drive in the lane unless prohibited by other specific road signs