The correct sentence should be:
"The old headmaster was walking along the road when he fell down."
Preposition Error:
"Below" means underneath (e.g., "below the surface"), which doesn’t fit the context.
"Along" is correct here, meaning moving in a line next to the road.
The “At” is used when you are at the top, bottom or end of something.
The house is at the end of the street.
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