Reducing speed limits should lead to fewer deaths on the roads.降低限速可以减少交通死亡人数。We need a vigorous campaign to reduce deaths on the roads.我们需要开展一场强有力的运动来减少交通死亡人数。If we improve drivers' hazard perception, road deaths will fall.如果我们提高司机们感知危险的能力，交通死亡人数就会下降。