A belisha beacon is a special kind of light you might see on the side of a road. It helps people who are walking to cross the road safely.
The beacon looks kind of like a tall, orange lollipop on a stick. It has a light on top that flashes on and off, which makes it easier for drivers to see it.
When someone wants to cross the road, they press a button on a pole nearby. The belisha beacon flashes to tell drivers to stop their cars, and the person can then safely cross the road.
So, the belisha beacon is like a special light that helps make sure people can cross the road safely when they are walking.