Final answer:
Before backing out of the driveway when children are close, visually check surroundings, perform a physical check around the car, make eye contact with any nearby children, and confirm they are at a safe distance. Always be ready to stop if a child becomes visible suddenly.
Step-by-step explanation:
When children are close, the most important action to take before reversing out of the driveway is to ensure their safety. Firstly, visually check your surroundings including using any rear-view and side mirrors to look for children. It's also advisable to walk around your vehicle to do a physical check. Children can be unpredictable, and just because it's clear when you first get in the car, doesn't mean a child hasn't suddenly appeared behind your vehicle. If there are children nearby, make eye contact with them and make sure they move to a safe distance away before you begin to back out. Additionally, you should roll down your windows to listen for any indications of children that may not be immediately visible.
Your driving should always be adjusted for the safety of children in the vicinity. This means being extra cautious and prepared to stop immediately if a child does appear suddenly, as children may not always be aware of the dangers posed by moving vehicles.