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cam (a non-circular wheel) Milling machinery
Installation Click here for movie. Installation using a cam (a non-circular wheel) Click here for movie.
Milling the surface of existing asphalt pavement allows low-cost, speedy installation of rumble strips.

In Japan, there was no milling machinery for rumble strips, because there had been no history of installing them. We modified a conventional road cutter by replacing its guide wheel with a cam (a non-circular wheel), as shown in the photos above. The cam causes the milling drum to move up and down to cut grooves into pavement as the machine moves forward. CERI, Nippo Corporation, and Wirtgen Japan, Co., Ltd. are jointly applying for a patent for this milling machine.


Milling specifications to minimize disruption to bicycles

Installation Click here for movie. Milling machinery

To install rumble strips at shoulders, a cutter drum is mounted on the left side of the road cutter body to mill grooves on the shoulder while traveling in the driving lane. A flexible suspension enables milling on slopes and at uneven shoulders.


Installation on Nat'l Rte 4 in Kurihara, Miyagi Pref. Rumble strips of 12-mm depth

Development of a milling drum for concrete enabled rumble strips to be installed on concrete pavement. However, milling concrete pavement wears the milling drum faster than milling asphalt pavement, and the milling speed on concrete is slower than on asphalt. These make installation costs on concrete pavement higher than those on asphalt pavement. Also, special measures need to be taken to prevent dust and to mill at joints.
Now, it is possible to install rumble strips even in tunnels. When milling in tunnels, appropriate safety measures should be taken to prevent accidents.