An optical system for evaluating a frame of a vehicle, comprising: a diagnostic, measurement and repair equipment adapted to be arranged on the vehicle comprising, one or more targets adapted to be secured at a desired location of the vehicle having an electronic circuitry including at least one set of photodiodes, and a measuring head adapted to be detachably mounted at a desired location of the vehicle via a linking structure comprising, a laser configured to emit laser beam towards the at least one set of photodiodes in view of measuring the distance to the at least one set of photodiodes, at least two rotatory encoders configured to generate at least two parameters representative of the vehicle; a database comprising memory unit for storing one or more vehicle information necessary to diagnose the vehicle; and a computing device in communication with the database and the diagnostic test equipment via a wireless network is configured to: receive data representative of parameters of the vehicle, said parameters comprising at least said two parameters generated by the at least two rotary encoders, and the distance measured by the laser, determine a position of the target to a reference point based on said parameters of the vehicle and said distance measured by the laser and position of a point of the vehicle, and compare a position of said the point of the vehicle with the vehicle information in the database to evaluate the state of the vehicle. a diagnostic, measurement and repair equipment adapted to be arranged on the vehicle comprising, one or more targets adapted to be secured at a desired location of the vehicle having an electronic circuitry including at least one set of photodiodes, and a measuring head adapted to be detachably mounted at a desired location of the vehicle via a linking structure comprising, a laser configured to emit laser beam towards the at least one set of photodiodes in view of measuring the distance to the at least one set of photodiodes, at least two rotatory encoders configured to generate at least two parameters representative of the vehicle; one or more targets adapted to be secured at a desired location of the vehicle having an electronic circuitry including at least one set of photodiodes, and a measuring head adapted to be detachably mounted at a desired location of the vehicle via a linking structure comprising, a laser configured to emit laser beam towards the at least one set of photodiodes in view of measuring the distance to the at least one set of photodiodes, at least two rotatory encoders configured to generate at least two parameters representative of the vehicle; a laser configured to emit laser beam towards the at least one set of photodiodes in view of measuring the distance to the at least one set of photodiodes, at least two rotatory encoders configured to generate at least two parameters representative of the vehicle; a database comprising memory unit for storing one or more vehicle information necessary to diagnose the vehicle; and a computing device in communication with the database and the diagnostic test equipment via a wireless network is configured to: receive data representative of parameters of the vehicle, said parameters comprising at least said two parameters generated by the at least two rotary encoders, and the distance measured by the laser, determine a position of the target to a reference point based on said parameters of the vehicle and said receive data representative of parameters of the vehicle, said parameters comprising at least said two parameters generated by the at least two rotary encoders, and the distance measured by the laser, determine a position of the target to a reference point based on said parameters of the vehicle and said distance measured by the laser and position of a point of the vehicle, and compare a position of said the point of the vehicle with the vehicle information in the database to evaluate the state of the vehicle. position of a point of the vehicle, and compare a position of said the point of the vehicle with the vehicle information in the database to evaluate the state of the vehicle.