I took metro to attend an important dinner tonight.

I walked over the pedestrian viaduct at the Chengdu Elevated Highway, and the Yan’an Elevated highway – the theoretically central point of the transportation system of Shanghai. If you have some ideas of the Shanghai’s elevated highway system, it is basically a few big circles, called Inner Ring Road, the Middle Ring Road, the Outer Ring Road (S20, formally A20), and the Suburb Ring Road (S30, formally A30). For the Ring Roads, there is one horizontal (east-west) back born road, named Yan’an Elevated Highway, and there is one vertical (north-south) elevated highway called Chengdu Elevated Highway. The intersection of these two highways is, naturally, the center of this big transportation system.

That is a mega project – there are two lane road for any possible connections. That is C(4, 2) composition problem – the answer is 6 different path to be built for this viaduct.

I took some photos of this viaduct via my new Google Nexus One phone. Here is the photo.

Photograph by Jian Shuo Wang at the intersection of Chengdu Elevated Highway, and the Yan’an Elevated Highway

Photograph by Jian Shuo Wang at the intersection of Chengdu Elevated Highway, and the Yan’an Elevated Highway

Photograph by Jian Shuo Wang at the intersection of Chengdu Elevated Highway, and the Yan’an Elevated Highway

Photograph by Jian Shuo Wang at the intersection of Chengdu Elevated Highway, and the Yan’an Elevated Highway

From time to time, you can find some artistic moment and scene of this city – that is good thing for life. Hopefully everyone enjoys his/her own city this way.