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With the gradual improvement of highway construction in plain areas, hilly areas, and economically developed regions of various provinces and cities, the focus of highway construction is gradually shifting towards mountainous areas and relatively underdeveloped mountainous regions. There are also more and more long tunnels and extra long tunnels. Due to their concealed and strip-shaped structural characteristics, tunnels have brought a series of changes to the traffic and driving environment, especially for long tunnels on highways with high traffic volume. The safety situation is very severe, and they have caused great losses due to safety issues.
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