Page:Manual on Uniform Traffic Control Devices for Streets and Highways, 1961 Edition.pdf/23

 Definitions

Certain terms are defined as they appear initially in this Manual. In addition, such terms and all others for which definitions are needed are presented in appendix A. These terms are grouped alphabetically under each of five headings: General, Signs, Markings, Signals, and Islands. 1960 Revision

In addition to a great many minor changes that a r e intended to make the design and application of traffic control devices more adequate for modern highways, without wide departure from the basic standards of previous editions, this 1960 revision of the Manual now includes specific provisions for signing expressways, with references to standards for the Interstate System

wherever applicable. It also includes, for the first time, an extensive special treatment of traffic control devices for highway construction and maintenance operations (part V) and a group of special signs for emergency civil defense applications (part VI). Standards for traffic signals (part 111) have been modernized in keeping with technical advances in that field.

It is assumed that a reasonable time will be allowed for the gradual replacement of any existing installations that may be made obsolete by the new standards, 6