Final answer:
Sectioned off lanes where explorers walk in the same direction at the same speed in a zone search is best described as explorers walking in a straight line from one end of the crime scene to the other.
Step-by-step explanation:
Sectioned off lanes where explorers walk in the same direction at the same speed in a zone search is best described as explorers walking in a straight line from one end of the crime scene to the other. This method is a systematic approach to ensure that large and potentially complicated areas such as crime scenes are thoroughly searched. It contrasts with other search patterns that include walking in spiral fashion, dividing the crime scene into quadrants, and performing parallel searches offset by 90°. When dealing with large, open zones with few orientation points, such as an underwater environment with limited landmarks, or a vast flat terrain, this method helps in the effective inspection and processing of the crime scene.