Which marker type is primarily used to indicate the lane through a contaminated area and the width of that lane?

• A. Handrail Markers
• B. Warning Flags
• C. Boundary Posts
• D. Safety Strings

Answer: (A)

The essential idea is providing a clear, durable guide that defines both where to go and how wide the path is through a contaminated area. Handrail markers accomplish this by being mounted along handrails or fixed points along the route, creating a continuous, visible cue that marks the lane and its width. Because they’re attached to fixed structures, they stay in place and are easy to see in various conditions, helping responders maintain the correct path and spacing as they move through the area.

Warning flags signal danger, but they’re typically used as temporary alerts rather than a precise, maintained lane guide. Boundary posts indicate the outer limits of the hazardous zone but don’t convey the actual route through the area or the lane’s width. Safety strings can mark a boundary, yet they’re fragile and don’t provide a reliable sense of exact width or a clear, continuous path. Handrail markers are thus the best choice for defining both the lane and its width in contaminated environments.