Case study


Concrete edges are widely used in constructing islands, left turns, slowing bends and other diversions.
During the day, these installations are highly useful and help:
• Channel traffic
• Slow traffic
• Protect drivers at crossings and car parks
• Protect pedestrians and other users including cyclists
At night, these installations become obstacles that are hard to see in the rain as well as in urban and other lit areas (projected shadows). 


The installations were comprehensively equipped with retro-reflective glass KERBMARKERs.
These studs are easy to install and at night are transformed into points of light by vehicle headlights, clearly defining the edge and position of the obstacle.
They produce no light pollution and do not hinder pedestrians or drivers – or even locals.
Once installed, these studs blend into their environment and remain effective for years.


These products are simple to install and take less than a minute to be fitted on standard concrete barriers.
The spacing is 1-2m between studs.
The stud sits on the top of the barrier or on its sloping edge (max. slope: 40°).

Step 1 : Hole drilled with a diamond core drill (47mm diameter set in 52mm diameter). This core drill has a height/position adjustable bumper ring so the same hole depth is systematically obtained (Holotool).

Step 2 : Core broken and removed using a screwdriver and a sharp, sideways movement. The core breaks off the shoulder on which the stud will sit. This shoulder is at the exact depth for correctly installing the stud.

Step 3 : Drilling fluid is removed from the hole (using a sponge or vacuum).

Step 4 : Stud installed using a plastic tapper or hammer. The stud sinks into the hole until it sits on the inside shoulder cut by the double ring.

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