606.1 Guardrail - Revision history

Legged1: /* 606.1.3.2 End Terminals, Crash Cushions and Anchors */ typo

2024-10-31T13:37:25Z

606.1.3.2 End Terminals, Crash Cushions and Anchors: typo

← Older revision		Revision as of 08:37, 31 October 2024
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	'''Bridge End Treatment'''		'''Bridge End Treatment'''

	Guardrail is placed at bridge ~~end~~ in accordance with typical locations ~~show~~ in the standard plans on most routes. When the bridge end is shielded with guardrail, crashworthy end terminals are provided.		Guardrail is placed at bridge ends in accordance with typical locations shown in the standard plans on most routes. When the bridge end is shielded with guardrail, crashworthy end terminals are provided.

	On certain low-volume highways throughout the state, bridge ends may be delineated in lieu of shielding. This option is viable where the operating speed is less than 60 mph and the design AADT is 400 or fewer vehicles per day. The delineation-only option is primarily governed by the parameters of speed and volume. Irrespective of any values for these parameters, however, the use of delineation-only is prohibited on Major Routes as well as the National Highway System (NHS).		On certain low-volume highways throughout the state, bridge ends may be delineated in lieu of shielding. This option is viable where the operating speed is less than 60 mph and the design AADT is 400 or fewer vehicles per day. The delineation-only option is primarily governed by the parameters of speed and volume. Irrespective of any values for these parameters, however, the use of delineation-only is prohibited on Major Routes as well as the National Highway System (NHS).

Hoskir: /* 606.1.3.2 End Terminals, Crash Cushions and Anchors */ updated per RR3931

2024-09-06T21:05:43Z

606.1.3.2 End Terminals, Crash Cushions and Anchors: updated per RR3931

← Older revision		Revision as of 16:05, 6 September 2024
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	:* On minor routes, existing end terminals (in serviceable condition) may be left in place. Engineering judgment in accordance with AASHTO’s Roadside Design Guide and crash history should be used to determine guardrail improvements for each project.		:* On minor routes, existing end terminals (in serviceable condition) may be left in place. Engineering judgment in accordance with AASHTO’s Roadside Design Guide and crash history should be used to determine guardrail improvements for each project.

	'''Grading for New Roadway Construction.''' When an end terminal falls within the limits of an area that includes construction of a new roadbed, provide the needed embankment (cut/fill) quantities to construct the Standard Grading Limits shown in [https://www.modot.org/media/16869 Standard Plan 606.81] and include that volume in the ~~tin~~ model. Indicate in the Summary of Quantities for Crashworthy End Terminals that “Standard Grading Limits” are required and that payment is included in the embankment quantities.		'''Grading for New Roadway Construction.''' When an end terminal falls within the limits of an area that includes construction of a new roadbed, provide the needed embankment (cut/fill) quantities to construct the Standard Grading Limits shown in [https://www.modot.org/media/16869 Standard Plan 606.81] and include that volume in the model. Indicate in the Summary of Quantities for Crashworthy End Terminals that “Standard Grading Limits” are required and that payment is included in the embankment quantities.

	See ''Roadside Design Guide 4th Edition 2011'', Chap. 8.3.3 (pages 8-4, 5, 6 and 7), for further information on grading. On projects without earthwork pay items, Class III shaping slopes shall be used to provide the flat recovery area.		See ''Roadside Design Guide 4th Edition 2011'', Chap. 8.3.3 (pages 8-4, 5, 6 and 7), for further information on grading. On projects without earthwork pay items, Class III shaping slopes shall be used to provide the flat recovery area.

	'''Grading for Existing Roadbeds.''' When end terminals are to be installed on an existing roadway, an evaluation of each location should be made to determine if an existing platform is already in place that meets the Standard Grading Limits shown in Std. Plan 606.81. If a sufficient platform does exist, indicate in the Summary of Quantities for Crashworthy End Terminals that no grading is necessary.		'''Grading for Existing Roadbeds.''' When end terminals are to be installed on an existing roadway, an evaluation of each location should be made to determine if an existing platform is already in place that meets the Standard Grading Limits shown in [https://www.modot.org/media/16869 Std. Plan 606.81]. If a sufficient platform does exist, indicate in the Summary of Quantities for Crashworthy End Terminals that no grading is necessary.

	If an existing platform does not exist, or is insufficient, evaluate the existing terrain and determine whether the Standard Grading Limits can reasonably be constructed with Shaping Slopes Class III without creating an excessively steep in-slope or blocking the ditch with fill (that is, project scope generally does not include purchasing new right of way and/or making significant alterations to the existing in-slopes/back-slopes/ditches). For most existing locations, retrofitting the terrain to meet the Standard Grading Limits is not feasible, but if it is, indicate in the Summary of Quantities for Crashworthy End Terminals that Standard Grading Limits are required and include the necessary quantities for Shaping Slopes Class III.		If an existing platform does not exist, or is insufficient, evaluate the existing terrain and determine whether the Standard Grading Limits can reasonably be constructed with Shaping Slopes Class III without creating an excessively steep in-slope or blocking the ditch with fill (that is, project scope generally does not include purchasing new right of way and/or making significant alterations to the existing in-slopes/back-slopes/ditches). For most existing locations, retrofitting the terrain to meet the Standard Grading Limits is not feasible, but if it is, indicate in the Summary of Quantities for Crashworthy End Terminals that Standard Grading Limits are required and include the necessary quantities for Shaping Slopes Class III.
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	If it is not practical to construct the Standard Grading Limits but Alternate Grading Limits can reasonably be constructed, indicate in the Summary of Quantities for Crashworthy End Terminals that “Alternate Grading Limits” are required and include the necessary quantities for Shaping Slopes Class III. This is the most common option for existing roadways.		If it is not practical to construct the Standard Grading Limits but Alternate Grading Limits can reasonably be constructed, indicate in the Summary of Quantities for Crashworthy End Terminals that “Alternate Grading Limits” are required and include the necessary quantities for Shaping Slopes Class III. This is the most common option for existing roadways.

	Shaping Slopes Class III should not be used if the existing terrain requires significant quantities of fill. When significant grading is required, other grading pay items should be used with specific volumetric quantities.		Shaping Slopes Class III should not be used if the existing terrain requires significant quantities of fill. When significant grading is required, other grading pay items should be used with specific volumetric quantities to provide the flat recovery area.

	If the existing terrain is such that Alternate Grading Limits cannot be reasonably constructed within the project scope, a design exception may be necessary.		If the existing terrain is such that Alternate Grading Limits cannot be reasonably constructed within the project scope, a design exception may be necessary.

	See ''Roadside Design Guide 4th Edition 2011'', Chap. 8.3.3 (pages 8-4, 5, 6 and 7), for further information on grading~~. On projects without earthwork pay items, Class III shaping slopes shall be used to provide the flat recovery area~~.		See ''Roadside Design Guide 4th Edition 2011'', Chap. 8.3.3 (pages 8-4, 5, 6 and 7), for further information on grading.

	'''Bridge End Treatment'''		'''Bridge End Treatment'''

Hoskir: /* 606.1.4 Maintenance Planning Guidelines for Guardrail */ updated link to maintenance guideline

2024-02-28T16:50:18Z

606.1.4 Maintenance Planning Guidelines for Guardrail: updated link to maintenance guideline

← Older revision		Revision as of 11:50, 28 February 2024
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	==606.1.4 Maintenance Planning Guidelines for Guardrail==		==606.1.4 Maintenance Planning Guidelines for Guardrail==

	'''Printable''' [~~[media~~:~~170 R227 Guardrails~~.pdf\|'''Maintenance Planning Guideline for Guardrail''']].		'''Printable''' [https://epg.modot.org/forms/general_files/MT/R227_update-guardrails.pdf '''Maintenance Planning Guideline for Guardrail'''].

	Index of all [[:Category:170 Maintenance Activity Planning Guidelines#Index of Printable Planning Guides\|Maintenance Planning Guidelines]].		Index of all [[:Category:170 Maintenance Activity Planning Guidelines#Index of Printable Planning Guides\|Maintenance Planning Guidelines]].

Hoskir: /* 606.1.3.2 End Terminals, Crash Cushions and Anchors */ updated links per email from Kaitlyn B.

2024-02-06T19:56:07Z

606.1.3.2 End Terminals, Crash Cushions and Anchors: updated links per email from Kaitlyn B.

← Older revision		Revision as of 14:56, 6 February 2024
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	\|align="center"\|'''Additional information on crashworthy end terminals and internet links to approved terminals'''		\|align="center"\|'''Additional information on crashworthy end terminals and internet links to approved terminals'''
	\|-		\|-
	\|align="center"\|[~~http~~://www.modot.~~mo.gov~~/~~business/standards_and_specs/endterminals.htm.~~ MoDOT's end terminal website]		\|align="center"\|[https://www.modot.org/end-terminals-crash-cushions-and-barrier-systems MoDOT's end terminal website]
	\|-		\|-
	\|align="center"\|[[:Category:1040 Guardrail, End Terminals, One-Strand Access Restraint Cable and Three-Strand Guard Cable Material#1040.4 Crashworthy End Terminal and Qualified Plastic Guardrail Block\|EPG 1040.4 Crashworthy End Terminal and Qualified Plastic Guardrail Block]]		\|align="center"\|[[:Category:1040 Guardrail, End Terminals, One-Strand Access Restraint Cable and Three-Strand Guard Cable Material#1040.4 Crashworthy End Terminal and Qualified Plastic Guardrail Block\|EPG 1040.4 Crashworthy End Terminal and Qualified Plastic Guardrail Block]]
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	[[image:606.3.2 Type C.jpg\|left\|225px\|\|thumb\|<center>'''A Type C Crash Cushion'''</center>]]		[[image:606.3.2 Type C.jpg\|left\|225px\|\|thumb\|<center>'''A Type C Crash Cushion'''</center>]]
	'''Type C.''' Type C crash cushions are an end treatment used for double-sided barriers, in gore areas and in the median. Like the Type B, this device can safely be impacted from several angles usually ranging from head-on to the opposite direction. Type C crash cushions, however, may be installed in both paved and unpaved surface locations, but must be installed on an asphalt or concrete pad in non-paved areas. After impact, these crash cushions are usually damaged beyond repair and as such, should be used only in areas where low, annual-impact frequencies are expected.		'''Type C.''' Type C crash cushions are an end treatment used for double-sided barriers, in gore areas and in the median. Like the Type B, this device can safely be impacted from several angles usually ranging from head-on to the opposite direction. Type C crash cushions, however, may be installed in both paved and unpaved surface locations, but must be installed on an asphalt or concrete pad in non-paved areas. After impact, these crash cushions are usually damaged beyond repair and as such, should be used only in areas where low, annual-impact frequencies are expected.
	~~{\| border="1" class="wikitable" style="margin: 1em auto 1em auto" align="right"~~
	\|+
	~~! style="background:#BEBEBE"\|'''[http://safety.fhwa.dot.gov/roadway_dept/ FHWA Eligibility Letters]<br/> for Roadside Safety Devices'''~~
	\|-
	~~\|style="background:#f5f5f5" align="center"\|[http://safety.fhwa.dot.gov/roadway_dept/policy_guide/road_hardware/barriers/ Barrier, Guardrails and Longitudinal Barriers]~~
	\|-
	~~\|style="background:#f5f5f5" align="center"\|[http://safety.fhwa.dot.gov/roadway_dept/policy_guide/road_hardware/breakaway/ Breakaway Signs/Lighting Supports]~~
	\|-
	~~\|style="background:#f5f5f5" align="center"\|[http://safety.fhwa.dot.gov/roadway_dept/policy_guide/road_hardware/wzd/ Work Zone Devices]~~
	\|}

	'''Type D.''' Type D crash cushions have all of the installation and performance parameters of the Type C, but must be at least 80% reusable and have the ability to be reset manually with a moderate amount of repair. Type D crash cushions should be used in gore areas or medians with moderate traffic volumes and where high-impact frequencies are expected.		'''Type D.''' Type D crash cushions have all of the installation and performance parameters of the Type C, but must be at least 80% reusable and have the ability to be reset manually with a moderate amount of repair. Type D crash cushions should be used in gore areas or medians with moderate traffic volumes and where high-impact frequencies are expected.

Hoskir: /* 606.1.3.1 Guardrail Selection and Placement */ updated link

2023-12-28T21:05:59Z

606.1.3.1 Guardrail Selection and Placement: updated link

← Older revision		Revision as of 16:05, 28 December 2023
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	'''Length of Need'''		'''Length of Need'''
	<html>		<html>
	<a style="display:block" href="https://epg.modot.org/files/0/02/606.1.3.~~1 Guardrail Length of Need Calculator Jul 2021~~.xlsx">		<a style="display:block" href="https://epg.modot.org/files/0/02/606.1.3.1_Guardrail_Length_of_Need_Calculator_Jul_2021.xlsx">
	<div style="float: right; margin-top: 5px; margin-left: 5px; width:300px; background-color: #f5f5f5; border-radius:5px; padding: 0.3em; border: 1px solid #cccccc; text-align:left;">		<div style="float: right; margin-top: 5px; margin-left: 5px; width:300px; background-color: #f5f5f5; border-radius:5px; padding: 0.3em; border: 1px solid #cccccc; text-align:left;">
	<b><u><center>Guardrail Length of Need Calculator</center></u></b>		<b><u><center>Guardrail Length of Need Calculator</center></u></b>

Hoskir: updated link

2023-12-28T21:04:22Z

updated link

← Older revision		Revision as of 16:04, 28 December 2023
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	===29 in. NCHRP 350 Guardrail System===		===29 in. NCHRP 350 Guardrail System===
	<html>		<html>
	<a style="display:block" href="https://epg.modot.org/files/0/02/606.1.3.~~1 Guardrail Length of Need Calculator Jul 2021~~.xlsx">		<a style="display:block" href="https://epg.modot.org/files/0/02/606.1.3.1_Guardrail_Length_of_Need_Calculator_Jul_2021.xlsx">
	<div style="float: right; margin-top: 5px; margin-left: 5px; width:300px; background-color: #f5f5f5; border-radius:5px; padding: 0.3em; border: 1px solid #cccccc; text-align:left;">		<div style="float: right; margin-top: 5px; margin-left: 5px; width:300px; background-color: #f5f5f5; border-radius:5px; padding: 0.3em; border: 1px solid #cccccc; text-align:left;">
	<b><u><center>Guardrail Length of Need Calculator</center></u></b>		<b><u><center>Guardrail Length of Need Calculator</center></u></b>

Hoskir: /* 606.1.3.1 Guardrail Selection and Placement */ updated link to guardrail calculator

2023-12-28T20:21:45Z

606.1.3.1 Guardrail Selection and Placement: updated link to guardrail calculator

← Older revision		Revision as of 15:21, 28 December 2023
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	'''Length of Need'''		'''Length of Need'''
	{\|style="~~padding~~: 0.~~3em~~; margin-left:~~7px~~; border:~~2px~~ solid #~~a9a9a9~~; text-align:left; ~~font-size: 95%; background:#f5f5f5~~" ~~width="280px" align="right"~~		<html>
	\|-		<a style="display:block" href="https://epg.modot.org/files/0/02/606.1.3.1 Guardrail Length of Need Calculator Jul 2021.xlsx">
	~~\|align="~~center~~"\|'''[[media:606.1.3.1~~ Guardrail Length of Need Calculator ~~Jul 2021~~.~~xlsx\|Guardrail Length of Need Calculator]]'''~~		<div style="float: right; margin-top: 5px; margin-left: 5px; width:300px; background-color: #f5f5f5; border-radius:5px; padding: 0.3em; border: 1px solid #cccccc; text-align:left;">
	\|}		<b><u><center>Guardrail Length of Need Calculator</center></u></b>
			This file is not compatible with Microsoft Online. You will need to right-click on the link and save the file.
			</div>
			</a>
			</html>

	The length of guardrail needed to shield a fixed feature (length of need) is dependent on the location and geometrics of the object, direction(s) of traffic, posted speed, traffic volume, and type and location of traffic barrier. The length of need and the flare rate of the guardrail shall be determined in accordance with the procedures contained in Sections 5.6.3 and 5.6.4 of the ''AASHTO Roadside Design Guide''. The general geometric data covering the length of need are illustrated on Figure 5.39 of the Roadside Design Guide.		The length of guardrail needed to shield a fixed feature (length of need) is dependent on the location and geometrics of the object, direction(s) of traffic, posted speed, traffic volume, and type and location of traffic barrier. The length of need and the flare rate of the guardrail shall be determined in accordance with the procedures contained in Sections 5.6.3 and 5.6.4 of the ''AASHTO Roadside Design Guide''. The general geometric data covering the length of need are illustrated on Figure 5.39 of the Roadside Design Guide.

Hoskir: /* 606.1.1 Types of Guardrail */ made change to wording in guardrail calculator link

2023-12-28T20:19:10Z

606.1.1 Types of Guardrail: made change to wording in guardrail calculator link

← Older revision		Revision as of 15:19, 28 December 2023
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	<div style="float: right; margin-top: 5px; margin-left: 5px; width:300px; background-color: #f5f5f5; border-radius:5px; padding: 0.3em; border: 1px solid #cccccc; text-align:left;">		<div style="float: right; margin-top: 5px; margin-left: 5px; width:300px; background-color: #f5f5f5; border-radius:5px; padding: 0.3em; border: 1px solid #cccccc; text-align:left;">
	<b><u><center>Guardrail Length of Need Calculator</center></u></b>		<b><u><center>Guardrail Length of Need Calculator</center></u></b>
	This file ~~does~~ not ~~work~~ with Microsoft Online. You will need to right-click on the link and save the file.		This file is not compatible with Microsoft Online. You will need to right-click on the link and save the file.
	</div>		</div>
	</a>		</a>

Hoskir: /* 29 in. NCHRP 350 Guardrail System */ updated link to Guardrail Calculator

2023-12-28T20:17:30Z

29 in. NCHRP 350 Guardrail System: updated link to Guardrail Calculator

← Older revision		Revision as of 15:17, 28 December 2023
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	===29 in. NCHRP 350 Guardrail System===		===29 in. NCHRP 350 Guardrail System===
	{\|style="~~padding~~: 0.~~3em~~; margin-left:~~7px~~; border:~~2px~~ solid #~~a9a9a9~~; text-align:left; ~~font-size: 95%; background:#f5f5f5~~" ~~width="280px" align="right"~~		<html>
	\|-		<a style="display:block" href="https://epg.modot.org/files/0/02/606.1.3.1 Guardrail Length of Need Calculator Jul 2021.xlsx">
	~~\|align="~~center~~"\|'''[[media:606.1.3.1~~ Guardrail Length of Need Calculator ~~Jul 2021~~.~~xlsx\|Guardrail Length of Need Calculator]]'''~~		<div style="float: right; margin-top: 5px; margin-left: 5px; width:300px; background-color: #f5f5f5; border-radius:5px; padding: 0.3em; border: 1px solid #cccccc; text-align:left;">
	\|}		<b><u><center>Guardrail Length of Need Calculator</center></u></b>
			This file does not work with Microsoft Online. You will need to right-click on the link and save the file.
			</div>
			</a>
			</html>

	:'''Type A Guardrail''' - single W beam rail with 6 ft. 3 in. post spacing.		:'''Type A Guardrail''' - single W beam rail with 6 ft. 3 in. post spacing.

Legged1: /* 606.1.3.3 Transitions and Connections */ update link

2023-12-06T23:18:19Z

606.1.3.3 Transitions and Connections: update link

← Older revision		Revision as of 18:18, 6 December 2023
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	\|<center>'''Additional Information'''</center>		\|<center>'''Additional Information'''</center>
	\|-		\|-
	\|align="center"\|[[751.1 Preliminary Design#Common Bridge ~~Rails~~ (for Rehabilitations)\|Common Bridge ~~Rails~~ (for Rehabilitations)]] Table		\|align="center"\|[[751.1 Preliminary Design#Common Bridge Barrier and Railing (for Rehabilitations)\|Common Bridge Barrier and Railing (for Rehabilitations)]] Table
	\|}		\|}