为掌握公路隧道调光参数的变化特征，更好地解决调光控制与隧道照明需求匹配的问题，采用改进的环境简图法结合环形线圈车检器同步获取浙东沿海丘陵地区6条公路隧道的长序列洞外亮度L20(S)和交通流数据。实测结果表明： 1）对浙东地区，公路隧道春、夏、秋、冬季的L20(S)峰值比例约为0.95∶1∶0.95∶0.85，晴天、云天、阴天、重阴天的L20(S)比例约为1∶0.6∶0.18∶0.11； 2）L20(S)是影响浙东地区公路隧道照明需求的主要因素，其对调光控制节能的贡献超过95%，交通流对隧道照明需求的影响较为有限； 3）隧道越短，调光控制所取得的节能效果越显著，短隧道采用无级调光，照明能耗可降低50%以上。

The long sequence of tunnel ambient exterior luminance L20(S) and the traffic data of 6 highway tunnels in the coastal hilly area of Eastern Zhejiang are obtained by using the improved environmental sketch method combined with the loop coil vehicle detector, so as to learn the variation laws of highway tunnel dimming and further solve the problem of dimming control matching with lighting demand of highway tunnel. The results show that: (1) In the Eastern Zhejiang, Area the ratio among peak values of L20(S) in spring, summer, autumn and winter, are about 0.95, 1,0.95, 0.85 respectively; and that in sunny, cloudy, overcast and heavy overcast weather conditions are about 1, 0.6, 0.18, 0.11 respectively. (2) L20(S) is the main factor which affects the lighting demand of the highway tunnel in eastern Zhejiang, and its contribution to energy saving is more than 95%; the influence of traffic on the tunnel lighting is limited. (3) The shorter the tunnel is, the more significant the energy savings is achieved by the dimming control; the stepless dimming of the short tunnels can save energy consumption by more than 50%.