page_title: Rumble strip
section_title: Pavement deterioration
hierarchical_section_title: Rumble strip / Deterioration / Pavement deterioration
caption_attribution_description: English: An example of extensive cracking in rumble strips due to frost jacking on Interstate Highway 81 north of Syracuse. These parallel cracks were sealed. There were other sections with grass and weeds growing up through the rumble strip cracks
context_page_description: Rumble strips are a road safety feature to alert inattentive drivers of potential danger, by causing a tactile vibration and audible rumbling transmitted through the wheels into the vehicle interior. A rumble strip is applied along the direction of travel following an edgeline or centerline, to alert drivers when they drift from their lane. Rumble strips may also be installed in a series across the direction of travel, to warn drivers of a stop or slowdown ahead, or of an approaching danger spot.
  In favorable circumstances, rumble strips are effective at reducing accidents due to inattention. The effectiveness of shoulder rumble strips is largely dependent on a wide and stable road shoulder for a recovery, but there are several other less obvious factors that engineers consider during design.
context_section_description: Generally, deterioration of the shoulder asphalt pavement due to rumble strip installation is not a problem.  However, if the sub-grade under the CSRS is poorly compacted or has poor drainage characteristics; or the gravel shoulder has eroded, crack(s) may form in the CSRS. Sand tends to fall into these cracks resulting in "jacking" of the cracks.  Water percolates vertically down through the soil, but it also creeps horizontally under the paved shoulder.  This may be a particular problem with narrow paved shoulders in regions with frequent freeze-thaw cycles that may result in frequent frost-heaving of the paved shoulder.
  US and Canadian guidelines recommend not installing rumble strips in asphalt pavement displaying cracks, to avoid excessive break-up of pavement.  It is also recommended that rumble strips be inspected in summer months for cracking, potholing, water ponding, and snowplow damage.  If necessary, structural problems should be repaired.  If the cracks become wide enough, grass and weeds will grow in the cracks accentuating the deterioration.
  The centerline of highway has a pavement joint and if milled CLRS are installed over this joint they will make pavement more vulnerable to deterioration.  Truckers have reported deterioration of the joint and the CLRS.
  Also, road salt prematurely degrades asphalt, so having it retained and concentrated in rumble strips is not desirable.
caption: An example of extensive cracking in rumble strips due to frost jacking on Interstate Highway 81 north of Syracuse.  These parallel cracks were sealed.  There were other sections with grass and weeds growing up through the rumble strip cracks
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