Figure 2-16. Examples of intraline distance.
Inhabited-Building Distance (IBD)
This distance is used for any building or structure (other than an operating building) that may be
occupied, whether it is inside or outside a DOD establishment. Included are schools, churches,
residences, service clubs, terminals, stores, and hospitals. IBD is illustrated in Figure 2-17 and Figure
Figure 2-17. Inhabited-building distance (IBD).
A magazine is any building or structure (except an operating building) that is used to store ammunition,
between any two storage magazines, as shown in Figure 2-19.
Public Traffic Route (PTR) Distance
The PTR distance applies to any public street, road, highway, navigable stream or passenger railway.
Examples of PTR distances are shown in Figure 2-20, Figure 2-21, and Figure 2-22.