903.16 Design Aspects of MoDOT Signing - Revision history

HogsettC: /* 903.16.4.2 Lateral Offset */

2025-12-01T17:05:03Z

903.16.4.2 Lateral Offset

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	===903.16.4.2 Lateral Offset===		===903.16.4.2 Lateral Offset===

	'''Guidance. '''The provisions below should be applied unless specifically stated otherwise in the EPG for a particular sign or object marker. See [[903.1 General (MUTCD Chapter 2A) #fig903.1~~.12~~\|Figures 903.1.12]] and [[903.1 General (MUTCD Chapter 2A) #fig903-1-13-1\|903.1.13]] which illustrate typical examples of the lateral offset requirements contained in this portion of the article.		'''Guidance. '''The provisions below should be applied unless specifically stated otherwise in the EPG for a particular sign or object marker. See [[903.1 General (MUTCD Chapter 2A) #fig903-1-13-1\|Figures 903.1.13.1]] and [[903.1 General (MUTCD Chapter 2A) #fig903-1-13-2\|903.1.13.2]] which illustrate typical examples of the lateral offset requirements contained in this portion of the article.

	Maximum offset will depend on roadway geometrics, profiles, and cross-sections, which all affect the visibility of the sign. Signs are generally to be placed no more than 15 ft. from the edge of shoulder.		Maximum offset will depend on roadway geometrics, profiles, and cross-sections, which all affect the visibility of the sign. Signs are generally to be placed no more than 15 ft. from the edge of shoulder.

HogsettC: /* 903.16.4.3.1 Mounting Height – U-Channel, Wood, Perforated Square Steel Tube (PSST), Pipe Posts and 4 in. Square Steel Posts */

2025-12-01T17:03:10Z

903.16.4.3.1 Mounting Height – U-Channel, Wood, Perforated Square Steel Tube (PSST), Pipe Posts and 4 in. Square Steel Posts

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	'''Guidance. '''Signs located outside of incorporated city limits that are located in areas having characteristics of an urban area, such as around businesses, heavy residential areas, areas with on street parking and areas with sidewalks which support bicycle and pedestrian traffic, should be installed at 7 feet.		'''Guidance. '''Signs located outside of incorporated city limits that are located in areas having characteristics of an urban area, such as around businesses, heavy residential areas, areas with on street parking and areas with sidewalks which support bicycle and pedestrian traffic, should be installed at 7 feet.

	'''Support. '''[[903.1 General (MUTCD Chapter 2A)#fig903.1~~.12~~\|Figure 903.1.12]] illustrates typical examples of the mounting height requirements contained for signs installed on U-Channel, Wood, PSST and Pipe Posts.		'''Support. '''[[903.1 General (MUTCD Chapter 2A)#fig903-1-13-1\|Figure 903.1.13.1]] illustrates typical examples of the mounting height requirements contained for signs installed on U-Channel, Wood, PSST and Pipe Posts.

	====903.16.4.3.2 Mounting Height – Wide Flange (I-Beam) Posts====		====903.16.4.3.2 Mounting Height – Wide Flange (I-Beam) Posts====

WilkeJ: /* {{SpanID|903.16.3}}903.16.3 Types of Fabricated Signs */

2025-12-01T03:15:09Z

{{SpanID|903.16.3}}903.16.3 Types of Fabricated Signs

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	Extruded panels are composed of a 1 ft. tall "E" shaped aluminum substrate, assembled to a desired height and cut to a uniform width for each sign. These panels are bolted together to form the larger “blank” substrate needed for structural signs.		Extruded panels are composed of a 1 ft. tall "E" shaped aluminum substrate, assembled to a desired height and cut to a uniform width for each sign. These panels are bolted together to form the larger “blank” substrate needed for structural signs.

			There are two types of reflective sheeting available to MoDOT:
			# MoDOT Type III High Intensity Prismatic (R2)
			# MoDOT Type VII Prismatic (R4).

			'''Guidance. '''Generally, R2 sheeting should be used on all sign backgrounds. R3 sheeting should be used on all legend and symbols on guide signs.

	=={{SpanID\|903.16.4}}903.16.4 Ground Mounted Sign Supports==		=={{SpanID\|903.16.4}}903.16.4 Ground Mounted Sign Supports==

TaracksA at 17:38, 21 November 2025

2025-11-21T17:38:12Z

← Older revision		Revision as of 12:38, 21 November 2025
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	[[Category:903 Highway Signing\|903.16]]		[[Category:903 Highway Signing (MUTCD Part 2)\|903.16]]
	=={{SpanID\|903.16.1}}903.16.1 Scope of Signs and Signing==		=={{SpanID\|903.16.1}}903.16.1 Scope of Signs and Signing==

HogsettC: /* 903.16.4.3 Mounting Height */

2025-11-19T16:27:00Z

903.16.4.3 Mounting Height

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	'''Support. '''There are typically two mounting heights for signs on u-channel, wood, PSST, pipe posts and 4 in. square steel posts, 5 feet and 7 feet. Traditionally, the 5-foot mounting height has been applied to “rural” areas and the 7-foot mounting high applied to “urban” areas or within incorporated city limits. However, the term “urban” has more to do with the conditions the signs are being installed within and less about being located within an incorporated city limit. The purpose of the 7-foot mounting height is to provide clearance for passing bicycle and pedestrian traffic, making the sign more visible over parked vehicles along the roadway and permits improved sight distance to drivers permitting them to see below the sign.		'''Support. '''There are typically two mounting heights for signs on u-channel, wood, PSST, pipe posts and 4 in. square steel posts, 5 feet and 7 feet. Traditionally, the 5-foot mounting height has been applied to “rural” areas and the 7-foot mounting high applied to “urban” areas or within incorporated city limits. However, the term “urban” has more to do with the conditions the signs are being installed within and less about being located within an incorporated city limit. The purpose of the 7-foot mounting height is to provide clearance for passing bicycle and pedestrian traffic, making the sign more visible over parked vehicles along the roadway and permits improved sight distance to drivers permitting them to see below the sign.

	'''Standard. '''[https://www.modot.org/standard-plans-section-900 Standard Plans 903] shall be referenced for specific installation and mounting height details. The details in Standard Plans 903 and EPG [[#903.16.4\|903.16.4]] shall apply to all signs unless specifically stated otherwise for a specific sign or object marker elsewhere in the EPG.		'''Standard. '''[https://www.modot.org/standard-plans-section-900 Standard Plans 903] shall be referenced for specific installation and mounting height details. The details in [https://www.modot.org/standard-plans-section-900 Standard Plans 903] and EPG [[#903.16.4\|903.16.4]] shall apply to all signs unless specifically stated otherwise for a specific sign or object marker elsewhere in the EPG.

	The minimum mounting height of a sign shall be measured vertically from the bottom of the sign to the elevation of the near edge of the pavement. Minimum sign mounting heights shall be as follows:		The minimum mounting height of a sign shall be measured vertically from the bottom of the sign to the elevation of the near edge of the pavement. Minimum sign mounting heights shall be as follows:

HogsettC: /* 903.16.4.9 Sign Mountings */

2025-11-19T16:26:07Z

903.16.4.9 Sign Mountings

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	'''Standard. '''Plastic/nylon washers shall be used between the heads of all twist fasteners (such as screws, bolts or nuts) and the sign face to protect the sheeting from the twisting action of the fasteners.		'''Standard. '''Plastic/nylon washers shall be used between the heads of all twist fasteners (such as screws, bolts or nuts) and the sign face to protect the sheeting from the twisting action of the fasteners.

	Signs shall be attached to each type of sign support in accordance with Standard Plans 903.		Signs shall be attached to each type of sign support in accordance with [https://www.modot.org/standard-plans-section-900 Standard Plans 903].

	'''Support. '''See [[903.1 General (MUTCD Chapter 2A)#903.1.18\|EPG 903.1.18]] for additional information on Sign Mountings.		'''Support. '''See [[903.1 General (MUTCD Chapter 2A)#903.1.18\|EPG 903.1.18]] for additional information on Sign Mountings.

HogsettC: /* 903.16.4.7 Breakaway Assemblies */

2025-11-19T16:25:44Z

903.16.4.7 Breakaway Assemblies

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	Sign trusses and other large sign support structures that are not breakaway shall be protected by acceptable shielding, such as guard rail or barrier wall.		Sign trusses and other large sign support structures that are not breakaway shall be protected by acceptable shielding, such as guard rail or barrier wall.

	'''Support. '''4 in. x 4 in. wood posts do not need any modification to be breakaway, however 4 in. x 6 in. and 6 in. x 6 in. wood posts will need to be cross drilled to meet breakaway standards. U-Channel posts do not require breakaway modifications if they are direct driven into the ground, however, if the ground stub and slice installation method is used the installation will need to be installed according to the Standard Plans 903 to meet breakaway requirements. PSST will require breakaway devices added in certain applications based on sign and number of posts used for an installation. The signpost selection tools will indicate when a breakaway is required for PSST posts. Pipe and Wide Flange posts have the breakaway devices integrated into the post design.		'''Support. '''4 in. x 4 in. wood posts do not need any modification to be breakaway, however 4 in. x 6 in. and 6 in. x 6 in. wood posts will need to be cross drilled to meet breakaway standards. U-Channel posts do not require breakaway modifications if they are direct driven into the ground, however, if the ground stub and slice installation method is used the installation will need to be installed according to the [https://www.modot.org/standard-plans-section-900 Standard Plans 903] to meet breakaway requirements. PSST will require breakaway devices added in certain applications based on sign and number of posts used for an installation. The signpost selection tools will indicate when a breakaway is required for PSST posts. Pipe and Wide Flange posts have the breakaway devices integrated into the post design.

	===903.16.4.8 Sign Orientation===		===903.16.4.8 Sign Orientation===

HogsettC: /* 903.16.4.8 Sign Orientation */

2025-11-19T16:25:24Z

903.16.4.8 Sign Orientation

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	'''Support. '''The orientation of the face of a sign in relation to the driver and roadway is critical to visibility and legibility, especially at night. The effectiveness of the retroreflective sheeting on a sign can be negatively impacted if the orientation of the sign face is not correct, due to incorrect installation and/or a signpost being damaged and knocked out of alignment.		'''Support. '''The orientation of the face of a sign in relation to the driver and roadway is critical to visibility and legibility, especially at night. The effectiveness of the retroreflective sheeting on a sign can be negatively impacted if the orientation of the sign face is not correct, due to incorrect installation and/or a signpost being damaged and knocked out of alignment.

	The orientation of a sign can also help reduce unwanted reflection or glare off of the sign face. The skew angle, shown in Standard Plans 903, is designed to help address this glare issue for tangent sections.		The orientation of a sign can also help reduce unwanted reflection or glare off of the sign face. The skew angle, shown in [https://www.modot.org/standard-plans-section-900 Standard Plans 903], is designed to help address this glare issue for tangent sections.

	'''Option. '''While the standard skew angle is 93 degrees, the skew angle may be adjusted to maintain brightness and avoid glare for signs on curved sections of road.		'''Option. '''While the standard skew angle is 93 degrees, the skew angle may be adjusted to maintain brightness and avoid glare for signs on curved sections of road.

HogsettC: /* 903.16.4.6 Backing Bars */

2025-11-19T16:25:10Z

903.16.4.6 Backing Bars

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	===903.16.4.6 Backing Bars===		===903.16.4.6 Backing Bars===

	'''Support. '''Backing bars are typically used to support and stiffen wide flat sheet signs mounted on single signpost or to help support the individual signs which make up sign assemblies to form one unified sign assembly. Details for backing bars can be found in Standard Plans 903.		'''Support. '''Backing bars are typically used to support and stiffen wide flat sheet signs mounted on single signpost or to help support the individual signs which make up sign assemblies to form one unified sign assembly. Details for backing bars can be found in [https://www.modot.org/standard-plans-section-900 Standard Plans 903].

	===903.16.4.7 Breakaway Assemblies===		===903.16.4.7 Breakaway Assemblies===

HogsettC: /* 903.16.4.5 Secondary Sign Supports – Post Extensions */

2025-11-19T16:24:55Z

903.16.4.5 Secondary Sign Supports – Post Extensions

← Older revision		Revision as of 11:24, 19 November 2025
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	===903.16.4.5 Secondary Sign Supports – Post Extensions===		===903.16.4.5 Secondary Sign Supports – Post Extensions===

	'''Support. '''These supports are 3 in. aluminum I-Beam used to attach exit number panels to the top of, or to hang a secondary sign below, structural signs on new installations. Details of these posts are shown in the Standard Plans 903.		'''Support. '''These supports are 3 in. aluminum I-Beam used to attach exit number panels to the top of, or to hang a secondary sign below, structural signs on new installations. Details of these posts are shown in the [https://www.modot.org/standard-plans-section-900 Standard Plans 903].

	'''Option. '''There are occasions where modifications and/or additions must be made to existing sign installations where the existing posts are not long enough to support the new sign assembly. In these cases, it is permissible to utilize secondary sign supports to effectively extend the primary signposts to support signs a maximum of 3 feet taller than the existing primary signposts.		'''Option. '''There are occasions where modifications and/or additions must be made to existing sign installations where the existing posts are not long enough to support the new sign assembly. In these cases, it is permissible to utilize secondary sign supports to effectively extend the primary signposts to support signs a maximum of 3 feet taller than the existing primary signposts.