Advance stop line rumble strips (ASLRS) are grooved strips placed upstream of a stop-controlled intersection.
Advance stop line rumble strips (ASLRS) (also called transverse rumble strips or in-lane rumble strips) are grooved strips placed upstream of a stop-controlled intersection. ASLRS are transverse to the direction of travel and provide an audible and tactile warning to the drivers.
Placement and design of ASLRS is covered in the Iowa DOT Design Manual, Chapter 6, 6A-7 (Iowa DOT 2014a) and the Iowa DOT Traffic and Safety Manual, Chapter 18, 18A (Iowa DOT 2014b).
Several studies have evaluated the effectiveness of ASLRS. One study used intersections from Iowa and Minnesota. The table below summarizes the studies where crash reductions were found. Other studies are summarized in a tech brief (see below).Crash Reduction Factors for Installation of ASLRS (Iowa and Minnesota)
|Intersection Type||Crash Type||CMF (Standard Error)|
|fatal and incapacitating injury||0.41 (0.24)|
|fatal and incapacitating injury||0.65 (0.17)|
More information is provided in this technical brief, which summarizes information about ASLRS relevant to Iowa.
Antonucci, Nicholas D., Kelly K. Hardy, Kevin L. Slack, Ronald Pfefer, Zikhron Yaacov, and Timothy R. Neuman. Volume 12: A Guide for Reducing Collisions at Signalized Intersections. NCHRP Report 500: Guidance for Implementation of the AASHTO Strategic Highway Safety Plan. Transportation Research Board, 2004.
Iowa DOT. 2014a. Iowa DOT Design Manual, Chapter 6, 6A-7. www.iowadot.gov/design/dmanual/manual.html?reload.
Iowa DOT. 2014b. Iowa DOT Traffic and Safety Manual, Chapter 18, 18A. Office of Traffic and Safety, Iowa Departement of Transportation.
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