designer's own words:We frequently see cyclists who ride on the city's road. However, cyclists are easily exposed to danger, because they ride with many other drivers. Moreover,on dark nights, cyclists are rarely visible to drivers, so night ride can be more dangerous for them. so, I suggest SAFETY SIGNAL HELMET : it is charged by solar & wind energy in daytime, and will be turned LED light showing cyclist's location in nighttime. Aerodynamic shape that getting a solar energy is a form that can be very effective.