High Quality Content by WIKIPEDIA articles! Drafting or slipstreaming is a technique where two vehicles or other moving objects are caused to align in a close group reducing the overall effect of drag due to exploiting the lead object`s slipstream. Especially when high speeds are involved, as in motor racing and cycling, drafting can significantly reduce the paceline`s average energy expenditure required to maintain a certain speed and can also slightly reduce the energy expenditure of the lead vehicle or object.