The speed bumps are installed in potentially sensitive areas to channel traffic and reduce speed. They are generally found in built-up areas, around areas limited to 30 km / h, schools, or on car parks and private roads. While the most well-known speed bumps are speed bumps or trapezoidal speed bumps, other arrangements can act as speed bumps.
Speed bumps which can be found in Unimat traffic are installed to enhance road safety by forcing road users to slow down. Since their implementation on roads and in urban areas, a decrease in fatal bodily accidents between motor vehicles, cyclists, and pedestrians has been noted.
Remember that in a collision between a vehicle and a pedestrian, the latter has an 80% chance of being killed if the vehicle moves at a speed of 50 km / h against 10% if it is traveling below 30 km / h.
Most warning devices consist of an elevation of the roadway of about 10 cm, which occupies part or all of the width of the roadway from a few centimeters to several meters in length. A pedestrian crossing accompanies some speed bumps (trapezoidal, plateau); others are not suitable for being crossed (speed bumps, cushion).
Installation Of Retarders
Some of these speed bumps can only be installed in built-up areas. This is the case with trapezoidal type retarders that you will only find in towns, in rest areas or service areas, or in forest roads, areas where the maximum authorized speed is 30 km / h.
It is forbidden to fit a trapezoidal type retarder:
before a bend and if the traffic in the area exceeds 3,000 vehicles per day
if the track has a gradient greater than 4%.
Meanwhile, elevated plateaus can be implemented regardless of the traffic volume and on limited roads 50 km / h with occasional limitations to 30 km / h.
While they make it possible to reduce the speed of vehicles on the outskirts of areas frequented by pedestrians, speed bumps are strongly criticized by some. Indeed, they can be dangerous for two-wheelers, not always adapted to the size of agricultural vehicles and heavy goods vehicles, and sometimes represent noise pollution near homes.