Introduction (Texas MUTCD, Section
2D.29
)

Conventional guide sign assemblies are created by combining the various components described in the previous section. These components are used in a particular manner and arrangement to ensure uniformity for the driver. This section concentrates on illustrating how guide signs, particularly route signs, are to be arranged in different assemblies so that different classes of highways and/or directions of travel are consistent.
The following terminology is used in describing the arrangement of guide sign components:
  • Component:
     The individual signs that are attached to a post or sign.
  • Unit:
     A collection of components that present the information related to travel on a specific highway. A unit consists of a route sign and the auxiliary signs (if used) above and below the route sign. The typical unit consists of (from top to bottom): a cardinal direction sign, a route sign, and a directional arrow sign.
  • Assembly:
     A collection of units that present information related to travel on all highways at or near a specific intersection.