The device to prevent the vehicle from speeding is the speed bump. The Actibump uses electricity and these machines will one day fail. Repairing the fault is costly and traffic should be controlled by working hours. However, Actibump's attempt is excellent and it may be necessary to install the device on certain roads.
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The point you nailed is right @supergiant
The power problem has also traffic lights and the failure keeps itself within limits, I am a car driver and do not experience this often.