626.2 Centerline Rumble Strips: Difference between revisions
Per CM, clarified the location of the rumbles strips and pavement markings for differing shoulder and pavement conditions. It also revised the minimum pavement thickness from 1 3/4" to 1". |
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[[Image:626.2 Centerline Rumble Strip Marking for Two Lane Roadway.jpg|right| 200px|thumb|<center>''' Centerline Rumble Strip Marking for Two-Lane Roadway'''</center>]] | [[Image:626.2 Centerline Rumble Strip Marking for Two Lane Roadway.jpg|right| 200px|thumb|<center>''' Centerline Rumble Strip Marking for Two-Lane Roadway'''</center>]] | ||
All two-lane [ | All two-lane [[media:144 Major Highway System.pdf|major roads]] with new pavement will have centerline rumble strips (see figure at right) unless the posted speed is less than 50 mph. Centerline rumble strips are provided on all major two-lane roads, and on minor roads with a cross-centerline [http://www.modot.mo.gov/safety/trafficaccidentstatistics.htm accident history]. Rumble strips on a centerline have been shown to reduce head-on crashes by alerting drivers that they are leaving their lane of travel. On roadways with a travelway width of 20 ft. or less, centerline rumble strips become obtrusive and are not recommended. | ||
[[image:626.2 Passing Lane Centerline Rumble Strip marking.jpg|left| 275px|thumb|<center>'''[[232.2 Passing Lanes|Passing Lane]] Centerline Rumble Strip Marking'''</center>]] | [[image:626.2 Passing Lane Centerline Rumble Strip marking.jpg|left| 275px|thumb|<center>'''[[232.2 Passing Lanes|Passing Lane]] Centerline Rumble Strip Marking'''</center>]] | ||
Revision as of 08:28, 26 April 2019
All two-lane major roads with new pavement will have centerline rumble strips (see figure at right) unless the posted speed is less than 50 mph. Centerline rumble strips are provided on all major two-lane roads, and on minor roads with a cross-centerline accident history. Rumble strips on a centerline have been shown to reduce head-on crashes by alerting drivers that they are leaving their lane of travel. On roadways with a travelway width of 20 ft. or less, centerline rumble strips become obtrusive and are not recommended.
As with edgeline rumble strips, pavement marking material is sprayed over the centerline rumble strip, creating what is often called a “rumble stripe.”
Rumble strips in the median of typical passing lane roadways (see Passing Lanes Special Sheet) vary somewhat from centerline rumble strips on typical two-lane roadways (see figure, to the left). Passing lanes can operate effectively with no separation between opposing lanes of travel. While no separation is required, AASHTO guidance recommends that some separation, however small, between the lanes in opposite directions of travel is desirable. Therefore, a flush separation of 4 ft. between the opposing directions of travel is preferred (see typical section), if at all possible.
In order to maintain the integrity of the rumble strip and the pavement, the pavement material must be either concrete or the final lift of bituminous material must be least 1 inch thick. Centerline rumble strips are not to be placed on bridges or within the limits of an intersection with left turn lanes. The limits of the intersection are defined by the beginning of the tapers for the left turn lanes. The length of centerline rumble strip installation should be estimated and pay items provided.