The directional antennas with received signal strength indicator (RSSI) output from 0.52 V to 1.34 V are designed as a receiving component. These antennas have the ability to rotate up to 180 & DEG; to find the maximum signal strength angle. RSSI signal strength is converted as customized measurement unit as Analog Reading Units (ARU) which varies from 0ARU to 400ARU and signal receiver has -90 dBm receiving sensitivity. The experimental results demonstrate that, the variance of RSSI with speed of a vehicle shows a clear relationship at the position of signal receiving point. Two regions are defined as effective region and non-effective region to show the capability of the proposed model. Effective region is of 60 m range from one vehicle to the other vehicle which plays a role in the overtaking process. When a vehicle is detected within the range, the RSSI value is greater than 150ARU. When the distance is less than 160 m, the RSSI value will be greater than 200ARU. Results prove that the overtaking status of a vehicle is clearly identified as zones and sectors ranging from 1 m to 160 m.
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