Advance Stop Line Rumble Strips

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).

  • It is suggested that rumble strips should not be added to reconstruction or resurfacing projects that do not involve geometric changes or changes in stop conditions unless the Office of Traffic and Safety requests them.
  • It is also recommended that rumble strips only be placed on approaches with a speed limit of 55 miles per hour (mph) or more.


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)
Three-approach total 1.22 (0.14)
fatal and incapacitating injury 0.41 (0.24)
Four-approach total 1.07 (0.104)
fatal and incapacitating injury 0.65 (0.17)


  • Short term implementation
  • Relatively low cost
  • Can be used with other countermeasures


  • Noise
  • Potential loss of control for motorcycles and bicycles (Antonucci et al. 2004)
  • Issues for winter maintenance (Antonucci et al. 2004)
  • Drivers using opposing lane to avoid

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.

Iowa DOT. 2014b. Iowa DOT Traffic and Safety Manual, Chapter 18, 18A. Office of Traffic and Safety, Iowa Departement of Transportation.

Image: Advance stop line rumble strips on a rural roadway

Advance stop line rumble strips (Shutterstock)

Development of this website was financed in part through funds provided by the Iowa Department of Transportation and Federal Highway Administration state planning and research funding.

The contents of this website reflect the views of the authors, who are responsible for the facts and the accuracy of the information presented herein. The opinions, findings and conclusions expressed in this website are those of the authors and not necessarily those of the sponsors.

The sponsors assume no liability for the contents or use of the information contained in this website. This website does not constitute a standard, specification, or regulation.

The sponsors do not endorse products or manufacturers. Trademarks or manufacturers' names appear on this website only because they are considered essential to the website's objective.