FM 5-36 Route Reconnaissance and Classification 1965-05-14"This manual describes the influence of the operational environment in reconnaissance operations, the intelligence aspects and fundamentals of route reconnaissance, and methods of reconnoitering and classifying routes for military use. Emphasis is placed on natural and manmade characteristics of routes which influence traffic flow. The interruption of movement by enemy action, an equally important consideration in route reconnaissance, is discussed in general terms only; specific details are not within the scope of this manual although thoroughly discussed in field manuals appropriate to the mission and organization of the reconnoitering force (see app. I).Route reconnaissance as presented by this manual is divided into two categories: hasty reconnaissance and deliberate reconnaissance. Hasty reconnaissance provides limited route information necessary for planning and executing normal military movement and is a prerequisite of tactical maneuver.