620.8 Islands - Revision history

Smithk: Per TS, MoDOT no longer uses buttons

2020-09-04T17:39:47Z

Per TS, MoDOT no longer uses buttons

← Older revision		Revision as of 12:39, 4 September 2020
Line 1:		Line 1:
	==620.8.1 General (MUTCD Section 3I.01)==		==620.8.1 General (MUTCD Section 3I.01)==

	'''Support.''' This addresses the characteristics of islands as traffic-control devices. Criteria for the design of islands are set forth in [[233.2 At-Grade Intersections with Stop and Yield Control#233.2.12 Islands\|At-Grade Intersections with Stop and Yield Control]] and [[233.4 At-Grade Intersections with Signal Control#233.4.1.8 Islands\|At-Grade Intersections with Signal Control]]. Also see ''MUTCD'' Section 1A.11 and ''A Policy on Geometric Design of Highways and Streets.''		'''Support.''' This addresses the characteristics of islands as traffic-control devices. Criteria for the design of islands are set forth in [[233.2 At-Grade Intersections with Stop and Yield Control#233.2.12 Islands\|At-Grade Intersections with Stop and Yield Control]] and [[233.4 At-Grade Intersections with Signal Control#233.4.8 Islands\|At-Grade Intersections with Signal Control]]. Also see ''MUTCD'' Section 1A.11 and ''A Policy on Geometric Design of Highways and Streets.''

	'''Option.''' An island may be designated by curbs, pavement edges, pavement markings, channelizing devices or other devices.		'''Option.''' An island may be designated by curbs, pavement edges, pavement markings, channelizing devices or other devices.
Line 8:		Line 8:

	'''Guidance.''' The ends of islands first approached by traffic should be preceded by diverging longitudinal pavement markings on the roadway surface, to guide vehicles into desired paths of travel along the island edge.		'''Guidance.''' The ends of islands first approached by traffic should be preceded by diverging longitudinal pavement markings on the roadway surface, to guide vehicles into desired paths of travel along the island edge.

	'''Support.''' The neutral area between approach-end markings that can be readily crossed even at considerable speed sometimes contains slightly raised (usually less than 1 in. tall) sections of coarse aggregate or other suitable materials to create rumble sections that provide increased visibility of the marked areas and that produce an audible warning to road users traveling across them. For additional discouragement to driving in the neutral area, bars or buttons projecting 1 to 3 in. above the pavement surface are sometimes placed in the neutral area. These bars or buttons are designed so that any wheel encroachment within the area will be obvious to the vehicle operator, but will result in only minimal effects on control of the vehicle. Such bars or buttons are sometimes preceded by rumble sections or their height is gradually increased as approached by traffic.

	'''Guidance.''' When raised bars or buttons are used in these neutral areas, they should be marked with white or yellow retroreflective materials, as determined by the direction or directions of travel they separate.

	'''Standard.''' Channelizing devices, when used in advance of islands having raised curbs, shall not be placed in such a manner as to constitute an unexpected obstacle.		'''Standard.''' Channelizing devices, when used in advance of islands having raised curbs, shall not be placed in such a manner as to constitute an unexpected obstacle.
Line 45:		Line 41:
	==620.8.6 Pedestrian Islands and Medians (MUTCD Section 3I.06)==		==620.8.6 Pedestrian Islands and Medians (MUTCD Section 3I.06)==

	'''Support.''' Raised islands or medians of sufficient width that are placed in the center area of a street or highway can serve as a place of refuge for pedestrians who are attempting to cross at a midblock or intersection location. Center islands or medians allow pedestrians to find an adequate gap in one direction of traffic at a time, as the pedestrians are able to stop, if necessary, in the center island or median area and wait for an adequate gap in the other direction of traffic before crossing the second half of the street or highway. The minimum widths for accessible refuge islands and for design and placement of detectable warning surfaces are provided in the ''Americans with Disabilities Act Accessibility Guidelines for Buildings and Facilities (ADAAG)'' (see ''MUTCD'' Section 1A.11).		'''Support.''' Raised islands or medians of sufficient width that are placed in the center area of a street or highway can serve as a place of refuge for pedestrians who are attempting to cross at a midblock or intersection location. Center islands or medians allow pedestrians to find an adequate gap in one direction of traffic at a time, as the pedestrians are able to stop, if necessary, in the center island or median area and wait for an adequate gap in the other direction of traffic before crossing the second half of the street or highway. The minimum widths for accessible refuge islands and for design and placement of detectable warning surfaces are provided in the [https://www.access-board.gov/guidelines-and-standards/buildings-and-sites/about-the-ada-standards/background/adaag ''Americans with Disabilities Act Accessibility Guidelines for Buildings and Facilities (ADAAG)''] (see ''MUTCD'' Section 1A.11).

	<div id="Fig. 620.8.6"></div>		<div id="Fig. 620.8.6"></div>

EPGsysop: /* 620.8.4 Island Marking Colors (MUTCD Section 3I.04) */

2017-04-07T18:47:24Z

620.8.4 Island Marking Colors (MUTCD Section 3I.04)

← Older revision		Revision as of 13:47, 7 April 2017
Line 31:		Line 31:
	The retroreflective area should be of sufficient length to denote the general alignment of the edge of the island along which vehicles travel, including the approach end, when viewed from the approach to the island.		The retroreflective area should be of sufficient length to denote the general alignment of the edge of the island along which vehicles travel, including the approach end, when viewed from the approach to the island.

	'''Option.''' On long islands, curb retroreflection may be discontinued ~~such~~ that it does not extend for the entire length of the curb, especially if the island is illuminated or marked with delineators or edgelines.		'''Option.''' On long islands, curb retroreflection may be discontinued so that it does not extend for the entire length of the curb, especially if the island is illuminated or marked with delineators or edgelines.

	An island with mountable curbs less than 3 in. tall may be marked with retroreflective markings or delineators.		An island with mountable curbs less than 3 in. tall may be marked with retroreflective markings or delineators.

Smithk: Per Traffic, revision to bring policy into substantial compliance with the 2009 MUTCD.

2012-01-18T19:30:51Z

Per Traffic, revision to bring policy into substantial compliance with the 2009 MUTCD.

Show changes

Smithk: 620.7 Islands (MUTCD Chapter 3G) moved to 620.8 Islands: Per Traffic, revision to bring policy into substantial compliance with the 2009 MUTCD.

2012-01-18T19:29:03Z

620.7 Islands (MUTCD Chapter 3G) moved to 620.8 Islands: Per Traffic, revision to bring policy into substantial compliance with the 2009 MUTCD.

← Older revision	Revision as of 14:29, 18 January 2012
(No difference)

Smithk: /* 620.7.2 Approach-End Treatment (MUTCD Section 3G.02) */Removed metric values, per TR

2010-04-12T19:31:34Z

620.7.2 Approach-End Treatment (MUTCD Section 3G.02): Removed metric values, per TR

← Older revision		Revision as of 14:31, 12 April 2010
Line 11:		Line 11:
	'''Guidance.''' The ends of islands first approached by traffic should be preceded by a gradually diverging marking on the roadway surface, to guide vehicles into desired paths of travel along the island edge.		'''Guidance.''' The ends of islands first approached by traffic should be preceded by a gradually diverging marking on the roadway surface, to guide vehicles into desired paths of travel along the island edge.

	'''Option.''' Approach-end markings that can be readily crossed even at considerable speed may contain slightly raised (usually less than 1 in. ~~(25 mm) high~~) sections of coarse aggregate or other suitable materials to create rumble sections that provide increased visibility of the marked areas and that produce an audible warning to road users traveling across them.		'''Option.''' Approach-end markings that can be readily crossed even at considerable speed may contain slightly raised (usually less than 1 in. tall) sections of coarse aggregate or other suitable materials to create rumble sections that provide increased visibility of the marked areas and that produce an audible warning to road users traveling across them.

	'''Standard.''' Rumble strips or other devices, when used in advance of islands having raised curbs, shall not be placed in such a manner as to constitute an unexpected obstacle.		'''Standard.''' Rumble strips or other devices, when used in advance of islands having raised curbs, shall not be placed in such a manner as to constitute an unexpected obstacle.

	'''Guidance'''. Bars or buttons should not project more than 1 to 3 in. ~~(25 to 75 mm)~~ above the pavement surface and should be designed so that any wheel encroachment within the area will be obvious to the vehicle operator, but will not result in loss of control of the vehicle.		'''Guidance'''. Bars or buttons should not project more than 1 to 3 in. above the pavement surface and should be designed so that any wheel encroachment within the area will be obvious to the vehicle operator, but will not result in loss of control of the vehicle.

	'''Option.''' Bars or buttons may be preceded by rumble sections, or their height may be gradually increased as approached by traffic.		'''Option.''' Bars or buttons may be preceded by rumble sections, or their height may be gradually increased as approached by traffic.

Smithk: /* 620.7.1 General (MUTCD Section 3G.01) */article construction

2009-07-16T13:32:48Z

620.7.1 General (MUTCD Section 3G.01): article construction

← Older revision		Revision as of 08:32, 16 July 2009
Line 1:		Line 1:
	==620.7.1 General (MUTCD Section 3G.01)==		==620.7.1 General (MUTCD Section 3G.01)==

	'''Support.''' This addresses the characteristics of islands as traffic-control devices. Criteria for the design of islands are set forth in [[233.2 At-Grade Intersections with Stop and Yield Control#233.2.1.12 Islands\|At-Grade Intersections with Stop and Yield Control]] and [[233.4 At-Grade Intersections with Signal Control#233.4.1.8 Islands\|At-Grade Intersections with Signal Control]].		'''Support.''' This addresses the characteristics of islands as traffic-control devices. Criteria for the design of islands are set forth in [[233.2 At-Grade Intersections with Stop and Yield Control#233.2.12 Islands\|At-Grade Intersections with Stop and Yield Control]] and [[233.4 At-Grade Intersections with Signal Control#233.4.1.8 Islands\|At-Grade Intersections with Signal Control]].

	'''Standard.''' An island for traffic control purposes shall be the defined area between traffic lanes for control of vehicular movements or for pedestrian refuge. Within an intersection area, a median or an outer separation shall be an island.		'''Standard.''' An island for traffic control purposes shall be the defined area between traffic lanes for control of vehicular movements or for pedestrian refuge. Within an intersection area, a median or an outer separation shall be an island.

EPG-Admin: Clarification of current practice on marking island curbs

2008-02-26T14:42:39Z

Clarification of current practice on marking island curbs

← Older revision		Revision as of 09:42, 26 February 2008
Line 34:		Line 34:

	'''Guidance.''' Islands outlined by curbs or pavement markings should be marked with retroreflective white or yellow material as determined by the direction or directions of travel they separate (see [[620.1 General (MUTCD Chapter 3A)#620.1.4 Colors (MUTCD Section 3A.04)\|Colors (MUTCD Section 3A.04)]]).		'''Guidance.''' Islands outlined by curbs or pavement markings should be marked with retroreflective white or yellow material as determined by the direction or directions of travel they separate (see [[620.1 General (MUTCD Chapter 3A)#620.1.4 Colors (MUTCD Section 3A.04)\|Colors (MUTCD Section 3A.04)]]).

			'''Standard.''' Island curbs with non-mountable curbs at least 6 in. tall shall be marked with retroreflective markings or delineators.

	The retroreflective area should be of sufficient length to denote the general alignment of the edge of the island along which vehicles travel, including the approach nose, when viewed from the approach to the island.		The retroreflective area should be of sufficient length to denote the general alignment of the edge of the island along which vehicles travel, including the approach nose, when viewed from the approach to the island.

	'''Option.''' On long islands, curb retroreflection may be discontinued such that it does not extend for the entire length of the curb, especially if the island is illuminated or marked with delineators or edge lines.		'''Option.''' On long islands, curb retroreflection may be discontinued such that it does not extend for the entire length of the curb, especially if the island is illuminated or marked with delineators or edge lines.

			An island with mountable curbs less than 3 in. tall may be marked with retroreflective markings or delineators.

	==620.7.5 Island Object Markers (MUTCD Section 3G.05)==		==620.7.5 Island Object Markers (MUTCD Section 3G.05)==

EPG-Admin at 14:20, 5 June 2007

2007-06-05T14:20:06Z

New page

==620.7.1 General (MUTCD Section 3G.01)==

'''Support.''' This addresses the characteristics of islands as traffic-control devices. Criteria for the design of islands are set forth in [[233.2 At-Grade Intersections with Stop and Yield Control#233.2.1.12 Islands|At-Grade Intersections with Stop and Yield Control]] and [[233.4 At-Grade Intersections with Signal Control#233.4.1.8 Islands|At-Grade Intersections with Signal Control]].

'''Standard.''' An island for traffic control purposes shall be the defined area between traffic lanes for control of vehicular movements or for pedestrian refuge. Within an intersection area, a median or an outer separation shall be an island.

'''Option.''' An island may be designated by pavement markings, channelizing devices, curbs, pavement edges, or other devices.

==620.7.2 Approach-End Treatment (MUTCD Section 3G.02)==

'''Guidance.''' The ends of islands first approached by traffic should be preceded by a gradually diverging marking on the roadway surface, to guide vehicles into desired paths of travel along the island edge.

'''Option.''' Approach-end markings that can be readily crossed even at considerable speed may contain slightly raised (usually less than 1 in. (25 mm) high) sections of coarse aggregate or other suitable materials to create rumble sections that provide increased visibility of the marked areas and that produce an audible warning to road users traveling across them.

'''Standard.''' Rumble strips or other devices, when used in advance of islands having raised curbs, shall not be placed in such a manner as to constitute an unexpected obstacle.

'''Guidance'''. Bars or buttons should not project more than 1 to 3 in. (25 to 75 mm) above the pavement surface and should be designed so that any wheel encroachment within the area will be obvious to the vehicle operator, but will not result in loss of control of the vehicle.

'''Option.''' Bars or buttons may be preceded by rumble sections, or their height may be gradually increased as approached by traffic.

Pavement markings may be used with raised bars to better designate the island area.

==620.7.3 Island Marking Application (MUTCD Section 3G.03)==

'''Standard.''' Markings, as related to islands, shall consist only of pavement and curb markings, object markers, and delineators.

On the approach to islands, the triangular neutral area in advance of the end of the island shall include pavement markings as described in [[620.2 Pavement and Curb Markings (MUTCD Chapter 3B)#620.2.10 Approach Markings for Obstructions (MUTCD Section 3B.10)|Approach Markings for Obstructions (MUTCD Section 3B.10)]].

'''Option.''' As indicated in [[#Approach-End Treatment (MUTCD Section 3G.02)|Approach-End Treatment (MUTCD Section 3G.02)]], rumble sections, or other similar traffic control designs which contrast with the pavement surface, may also be applied in the triangular neutral area in advance of the end of an island.

'''Guidance.''' When raised bars or buttons are used in these neutral areas, they should be marked with white or yellow retroreflective materials, as determined by the direction or directions of travel they separate.

==620.7.4 Island Marking Colors (MUTCD Section 3G.04)==

'''Guidance.''' Islands outlined by curbs or pavement markings should be marked with retroreflective white or yellow material as determined by the direction or directions of travel they separate (see [[620.1 General (MUTCD Chapter 3A)#620.1.4 Colors (MUTCD Section 3A.04)|Colors (MUTCD Section 3A.04)]]).

The retroreflective area should be of sufficient length to denote the general alignment of the edge of the island along which vehicles travel, including the approach nose, when viewed from the approach to the island.

'''Option.''' On long islands, curb retroreflection may be discontinued such that it does not extend for the entire length of the curb, especially if the island is illuminated or marked with delineators or edge lines.

==620.7.5 Island Object Markers (MUTCD Section 3G.05)==

'''Option.''' Object markers may be installed alone or in combination with signs (such as KEEP RIGHT, KEEP LEFT, double arrows, or guide signs) located within the island.

==620.7.6 Island Delineators (MUTCD Section 3G.06)==

'''Standard.''' Delineators installed on islands shall be the same colors as the related edge lines except that, when facing wrong-way traffic, they shall be red (see [[620.4 Delineators (MUTCD Chapter 3D)#620.4.3 Delineator Application (MUTCD Section 3D.03)|Delineator Application (MUTCD Section 3D.03)]]).

Each roadway through an intersection shall be considered separately in positioning delineators to assure maximum effectiveness.

[[Image:620.7 Markings for Islands Painted and Raised.gif]]

[[Category:620 Pavement Marking|620.07]]