The paper studies the maximum lengths for natural ventilation in low class highway tunnels which are dependent on traffic volume,car speeds,longitudinal grades of tunnels,types of vehicles,etc.

• 文章针对车辆为双向行驶的低等级公路隧道,研究无需进行机械通风而仅采用自然通风的隧道最大长度,该长度与交通量、行车速度、隧道纵坡、交通车辆类型等因素有关。