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在一次又一次的造山运动中,在燕山山脉、太行山脉的崛起中,大自然在南北两山之间为我们留下了一条东西通道。就是这条通道,使它成为历史上西接晋蒙、东连京津的交通要道。尤其是京张干路早在战国时期就可通行,辽元时代已经有了相当的规模。如今在这条通道上,京张公路、京包铁路、丰沙铁路一路西行,桑干河、洋河、永定河汇集于此,蜿蜒向东。据交通部门统计,京张公路上每天的车流量最多时达到3万多辆,白天高峰期京张公路怀来段上的车流量每分钟达到30～50辆。山西
In time and again the orogeny, in the rise of the Yanshan Mountains and the Taihang Mountains, nature has left us an east-west passage between the two mountains. It is this passageway that made it the gateway to the west of Shanxi and the east of Beijing and Tianjin. In particular, as early as during the Warring States Period, the Chang-Kyo Highway was accessible. The Liao and Yuan dynasties already had a considerable size. Now on this channel, Beijing Zhang Highway, Beijing-Bao railway, Feng Sha railway all the way west, Sanggan River, Yang River, Yongding River pool here, meandering eastward. According to traffic statistics, the daily traffic volume on the Beijing-Zhangdao Highway reaches more than 30,000 vehicles. During the peak of the day, the traffic volume on the Huailai section of the Beijing-Zhangdao Highway reaches 30 to 50 vehicles per minute. Shanxi