A modular vehicle test road construction system and associated installation method. The mobile computing device is configured to include a processor, a first LCD display unit connected to the processor, and a second diffuse reflecting display unit connected to the processor. The peg module is positioned within the interior of the body and the connector of various specification has a common plug for connection with a protruding peg of the adapter. The location of the fault is determined based on a distance from a terminal bus of the faulty line segment to a location along the faulty line segment having a value the voltage on the faulty phase equals zero.