It is acceptable to have blocked walkways along a fire exit route as long as the sign is still visible is a false statement.
An exit route is known to be a kind of a continuous and unobstructed way of exiting from any place within a workplace to a point or area of safety.
Note that since the sign is still visible there is no need to block it. Hence, It is acceptable to have blocked walkways along a fire exit route as long as the sign is still visible is a false statement.
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