Rumble Strip
ELM-RMS-07 Situational / Discouraged Element
Rumble Strip
A textured roadway surface, typically a series of shallow grooves or raised bars, that alerts drivers through vibration and sound when a vehicle crosses it.
Why this pattern exists
Rumble strips address inattention and lane departure rather than speed directly, giving a driver an audible and tactile cue at a specific location or along a stretch of roadway, distinct from the speed-reduction goal of vertical deflection treatments. This pattern exists to document that separate function and its own siting considerations.1
Key considerations
- Placement near residences requires care, since the noise generated can create a livability conflict for adjacent properties
- Not effective at reducing speed on its own; better suited to alerting for an upcoming change (stop condition, curve, edge of pavement) than as a substitute for vertical speed control
- Should not be used where it may pose a hazard to bicyclists sharing the roadway without an alternative path around it2
Related patterns
Vertical Speed Control (ELM-VSC-06) (related but functionally distinct calming treatment); Warning Sign (ELM-WNS-12) (often paired to alert of an upcoming condition)
References
- Evidence-based Persaud, B., Lyon, C., Eccles, K., and Soika, J., "Safety Evaluation of Centerline Plus Shoulder Rumble Strips," FHWA-HRT-15-048 (Federal Highway Administration, 2015); NCHRP Report 641.
- Evidence-based Federal Highway Administration, "Rumble Strips and Bicycle Accommodation," fact sheet.