__ rumble strips make the most noise and provide more vibration than other types of rumble strips. Milled Rolled Raised Formed

## Step 1<br />Rumble strips are a type of road safety feature designed to alert inattentive drivers through vibration and sound when they drive over them. They are typically used on the edges of roads and in the center of the road to alert drivers who unintentionally drift off the roadway.<br /><br />## Step 2<br />There are three main types of rumble strips: milled, rolled, and raised. Each type is created using a different method, which affects the noise and vibration they produce.<br /><br />## Step 3<br />Milled rumble strips are cut into the road surface using a milling machine. This process creates a series of grooves that are deeper and more uniform than those created by other methods. Because of this, milled rumble strips produce the most noise and vibration, making them the most noticeable to drivers.<br /><br />## Step 4<br />Rolled rumble strips are created by rolling a series of metal bars or tubes over the road surface. This method creates a less uniform and less deep series of grooves compared to milled strips, resulting in less noise and vibration.<br /><br />## Step 5<br />Raised rumble strips are elevated above the road surface, typically by about 1 to 2 inches. This elevation creates a series of bumps that drivers must navigate, but because they are not as deep or as numerous as the grooves in milled strips, they produce less noise and vibration.<br /><br />## Step 6<br />Given the options provided, milled rumble strips make the most noise and provide more vibration than the other types of rumble strips.