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Frequently Asked Questions

What are rumble strips and what are they used for?

Rumble strips, raised profile line markings or audio tactile profiled (ATP) road markings, are road markings that generate noise and vibration when you drive over them. The lines are painted like normal road markings except the machine drops ridges (also called blocks or ribs) at intervals.

What is the minimum lane width for rumble strips?

Effective lane width is defined as the clear distance between a pavement marking or centerline rumble strip on the left side of the travel lane and the rumble strip associated with the rumble stripe on the right side of the travel lane. The minimum effective lane width that should be maintained is 9’- 4‖.

Which is better a yellow line or a rumble strip?

After the rumble strips are ground in, the white or yellow line is marked right over the rumble strips. The advantage is that the edgeline or centerline is much more visible in the rain and the rumble strip provides warning to a motorist who strays from the driving lane.

What makes a rumble strip a classic car crash?

This form of one-car crash is "classic" because it occurs very often. Raised edges of pavement (or "edge-drops") were once common, but are now recognized as a hazard; it is now standard practice to level the gravel shoulder with the pavement, although edge-drops may reform due to soil erosion.


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