Oregon OSHA

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Oregon OSHA defines a stairway as a series of steps and landings having three or more risers. Most people take stairways (and stairs) for granted until they fall while they are using them. You can make your trip up or down a flight of stairs much safer if you remember to use the handrail. That is why every flight of stairs having four or more risers must have a standard railing or handrail.​​