Chapter 8: Markers and Delineation
Section 1: Overview
Introduction
Roadside markers consist of object markers, delineators, and
barrier reflectors. They are intended to provide motorists recognition
and guidance information about roadside features. Each type of roadside
marker has a particular use, but all provide guidance to drivers
when roadway conditions necessitate additional guidance above and
beyond pavement marking capabilities. Typical features where roadside
markers are usually provided include horizontal curves, bridges,
guardrails, exit and entrance ramps to controlled access facilities,
and the like. Roadside markers can be used for a wide variety of
conditions and must be considered for each specific situation. Consequently,
there are many different roadside marker applications for the various
conditions along Texas roadways. Chevrons and large arrow signs
are also commonly used in horizontal curves and are included in this
chapter.
This chapter has been developed to provide the user basic
concepts as well as general roadside marker treatments. The general
design and use of object markers, delineators, barrier reflectors, chevrons,
and large arrow signs are presented, as well as generic treatments
of each. The actual number of different treatments is potentially
endless and therefore, only the most common treatments are supplied
as examples. Additional information is also provided so that proper
roadside marker treatments can be implemented in practically any
situation.