April 17, 2019

What Are the Four Types of Shoulder Rumble Strips

Rumble strips exist to alert drivers when their car has veered onto the shoulder of a road or highway. Did you know that there are actually four types of shoulder rumble strips?

Rolled Rumble Strips

These rumble strips contain grooves that are either rounded or V-shaped. These strips are pressed into hot asphalt pavements and shoulders during a time when the constructed or reconstructed surface is compacted. Rather than a cutting drum, these stripe are created with rollers with steel pipes welded to a rotating drum. The vibration created from these strips are not as loud or pronounced as ones that come from milled strips but they still produce enough sound to alert drivers who happen to drift into them.

Milled Rumble Strips

Depending on the size of the groove, these rumble strips can produce various amounts of vibration as well as different pitches of sound. The general rule of thumb here is that the wider and deeper the rumble strip, the more sound and vibration are produced from them. A five to seven inch cut with a half inch of depth spaced every twelve inches seems to be the standard sizes for a milled rumble strip; however, some states are experimenting with four inch edge line rumble strips. Milled rumble strips are created with a machine that contains a rotary cutting head, much like our Rumble Hog!

Formed Rumble Strips

Like rolled rumble strips, these strips are either rounded or V-shaped. They way they are created is what sets them apart from rolled strips. Formed strips are made by pressing prefabricated forms into concrete shoulders as they are being constructed.

Raised Rumble Strips

Raised strips are two inch to twelve inch wide rounded or rectangular markers or strips that adhere to new or existing pavement surfaces. Some companies opt to use raised buttons as an alternative. Due to their height, these types of strips are usually seen in warmer climates that don’t require snow removal as plows can easily damage these strips.

No matter what kind of rumble strip, their job remains the same: keeping people safe while on the road!