Chapter 2: Principles of Freeway Signing

Section 1: Overview

Introduction

This chapter describes some of the basic principles associated with freeway signing. These principles provide broad guidance on the use of freeway guide signs and form the basis for many of the processes described in later chapters of this handbook. These principles include:
  • the underlying philosophy for providing guidance information on freeways
  • driver information needs
  • definitions and terminology used to define interchange classifications
  • the process used to design and locate freeway guide signs
  • various policies related to freeway signing, including:
    • retroreflective sheeting
    • illumination
    • clearance
    • control cities
    • support structures.