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How does Shanghai-Shaanxi Expressway avoid Yu 'an District of Lu 'an?

According to the relevant information query shows:

1, G40 The Lu 'an section of Shanghai-Shaanxi Expressway detours northward to Dagudian section.

2. Vehicles heading for Hefu or Ji Ye from Dagudian section in the north will bypass National Highway 3 12 and get off the expressway.

3. To sum up, how does the Shanghai-Shaanxi Expressway avoid the route of Yu 'an District in Lu 'an?