A test car is a vehicle that is specifically designed and used for testing purposes. It can be equipped with various sensors, data loggers, and other instruments to measure and record different aspects of its performance such as speed, acceleration, braking distance, fuel consumption, emissions levels, and more. Test cars are often used by automobile manufacturers, government agencies, and research institutions to evaluate the safety, reliability, and efficiency of new vehicles or vehicle components, as well as to conduct studies on driving behavior, traffic patterns, and other aspects of transportation systems.