TRAFFIC OPERATIONS
CHAPTER 130
SIGNING MANUAL
[Prior to 6/3/87, Transportation Department[820]—(06,K) Ch 2]
761—130.1(321) Manual. The “Manual on Uniform Traffic Control Devices” (MUTCD), 2009 Edition dated December 2009, published by the U.S. Department of Transportation, Federal Highway Administration, shall constitute the manual and specifications for a uniform system of traffic control devices for use upon the highways of this state.
	130.1(1) The department makes the following exception to the MUTCD for school zones: In Part 2, Section 2B.04, paragraph 12, of the MUTCD, Right-of-Way at Intersections, Standard, in lieu of the sentence “Portable or part-time STOP or YIELD signs shall not be used except for emergency and temporary traffic control zone purposes,” the department adopts the following: “Portable or part-time STOP signs may be used only in the following situations:
“1. When necessary for emergency and temporary traffic control zone purposes, or
“2. In school zones at appropriate school crosswalks.”
	130.1(2) The department makes the following exception to the MUTCD, Section 1A.09, Engineering Study and Engineering Judgment: Add the following paragraphs to the Guidance section prior to paragraph 03:
“The decision to use a particular device at a particular location should be made on the basis of either an engineering study or the application of engineering judgment. While the MUTCD provides standards, guidance, and options for design and application of traffic control devices, the MUTCD should not be considered a substitute for engineering judgment.
“Engineering judgment should be exercised in the selection and application of traffic control devices, as well as in the location and design of the roads and streets that the devices complement.”
	130.1(3) The department makes the following exception to the MUTCD, Section 1A.13, Definitions of Headings, Words, and Phrases in this Manual, paragraph 01, definition of “Standard,” to read as shown:
“A. Standard—a statement of required, mandatory, or specifically prohibitive practice regarding a traffic control device. All Standard statements are labeled, and the text appears in bold type. The verb ‘shall’ is typically used. The verbs ‘should’ and ‘may’ are not used in Standard statements. Standard statements are sometimes modified by Options.”
	130.1(4) Copies of the MUTCD are available for examination at the Office of Traffic and Safety, Iowa Department of Transportation, 800 Lincoln Way, Ames, Iowa 50010. The MUTCD is also available on the Internet at http://mutcd.fhwa.dot.gov.
This rule is intended to implement Iowa Code sections 321.249 and 321.252.
[ARC 9362B, IAB 2/9/11, effective 3/16/11]
[761—Chapter 130 appeared as Highway Commission rule, 1973 IDR, p.	517; amended January 1975 Supplement, p.	89. (Note: No chapter number was given.)]
[Filed 3/11/65; amended 5/16/72, 9/24/74]
[Filed 8/13/79, Notice 5/30/79—published 9/5/79, effective 10/10/79]
[Filed 11/16/84, Notice 8/15/84—published 12/5/84, effective 1/9/85]
[Filed 10/2/85, Notice 8/14/85—published 10/23/85, effective 11/27/851]
[Filed 2/6/87, Notice 12/17/86—published 2/25/87, effective 4/1/87]
[Filed 5/11/87, Notice 3/11/87—published 6/3/87, effective 7/8/87]
[Filed 11/1/89, Notice 9/20/89—published 11/29/89, effective 1/3/90]
[Filed 11/2/94, Notice 9/28/94—published 11/23/94, effective 12/28/94]
[Filed 4/17/96, Notice 3/13/96—published 5/8/96, effective 6/12/96]
[Filed 10/10/02, Notice 8/7/02—published 10/30/02, effective 12/4/02]
[Filed 9/14/05, Notice 8/3/05—published 10/12/05, effective 11/16/05]
[Filed ARC 9362B (Notice ARC 9290B, IAB 12/15/10), IAB 2/9/11, effective 3/16/11]
1	Effective date of subrule 2.1(2) delayed until the expiration of 45 calendar days into the 1986 Session of the General Assembly pursuant to Iowa Code section 17A.8(9). The 1986 General Assembly took no formal action; therefore, subrule 2.1(2) is effective 2/28/86.