The advantages of solar cars are obvious -- they are pollution-free, and the abundant sunlight is their energy source. The hurdles: With today's technology, a solar car would have to be light enough for the photovoltaic modules to provide enough energy to power the car and keep it moving fast on the road; In addition, it has enough storage battery power to ensure that the car can travel long distances in the absence of sunlight (dark or cloudy). As part of their research and development, many organizations are refining solar power systems for vehicles to make them more efficient and less costly. Some car companies are ramping up their efforts to develop new gasoline/electric hybrids. In the future, the technology development of solar cars will be faster and faster.