What You Should Know About Electronic Spines

The electronic speed humps work from sensors, adequately spaced and placed on the road, which determine the speed of the cars.

Traffic offenses committed for speeding are perhaps the most common and most frequent. To limit the speed of cars on roads, generating more safety for both drivers and pedestrians, electronic speed controllers, or the popularly known electronic speed humps, are installed on busy roads, which generally have a large flow of pedestrians, hospitals, schools, etc.

The functioning of this equipment is based on the physical principle of calculating the average speed. Under the road and adequately spaced, two sensors are installed that are activated from the vehicle’s passage; these sensors are connected to a center that, in turn, determines the speed value.

When the vehicle activates the first sensor, the timing starts, interrupted when the vehicle passes through the second sensor. The vehicle speed is determined from the ratio between the measured time and the space between the sensors. If this speed exceeds a set maximum value, the system takes an image of the car and generates a fine.

Attempting a sudden deceleration when you are close to the electronic hump can cause collisions between vehicles since the vehicle behind may not have enough space for braking. The correct thing is always to obey the speed limits.

Example: Suppose that the distance between the sensors installed on the street is 1.5m and that the time for a vehicle to pass determined by the system was 0.075s. What will the speed of this vehicle be determined by the electronic spine?

From the definition of velocity, we have: V = Δs.


V = 1.5m   = 20 m/s → V = 20 m/sx 3.6 = 72 Km/h


The vehicle speed indicated by the electronic spine would be 72 km/h.

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