The Different Types Of Speed Bumps

Watching out for road limitations, speed bumps exist in quite a variety of forms.

Discover in this article the different types of speed bumps, the standards to be respected as well as the strategic places where to install them.


Speed Bumps


In a general and official way, the word retarder is used to designate the different types of raising of a roadway in order to force a vehicle to reduce its speed.

Especially placed in built-up areas where vehicles cannot travel above 30 km/h, the Cassis speed bumps help ensure the safety of pedestrians around schools or the city centre.


Historic speed bump: the speed bump!

This is the oldest and most common speed bump. Generally in the form of a bump perpendicular to the road, it is popularly called a «recumbent policeman».

It can be installed on a track receiving 2000 to 3000 vehicles per day.

Dimensions : 100 mm in height (+ 10 mm tolerance in construction) for a length of 4 m (+ 0.20 m tolerance in construction).

Trapezoidal type speed bumps

A geometric derivative of the classic speed bump, the trapezoidal speed bump has a raised platform and two sloping parts, as well as a mandatory pedestrian crossing.

Characteristics: Height of 100 mm (+ 10 mm of tolerance in construction) for a total length of the plate between 2.50 m and 4 m.

Speed bumps for private roads

Made of rubber or cement, these speed bumps regulate traffic on private roads such as hospitals, shopping centres, warehouses, petrol stations, etc.

Soundtrack or rough

Aptly named and resembling a thinner and lower speed bump, this type of retarder emits a dull noise each time the wheels of a vehicle pass.

These strips are put on the road in groups of three to six in order to mark the spirit of the driver.


A speed bump is an elevation of the roadway that occupies the entire width of the roadway up to the sidewalk curbs.

Using trays as a speed reducer is an investment 3 to 5 times greater than speed cushions for a slightly lower maintenance cost (the cushions are changed periodically, etc.).

Their installation is not recommended on public transport routes where traffic is significant, as well as on routes frequently used by heavy goods vehicles in order to avoid noise pollution…

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