Snapshot of mid-rise buildings' skyline besides the arterial road of a busy city

Sharing this photo from our google plus (g+) account http://goo.gl/8vhIH

Its a night shot clicked & shared by one of our team members. The skyline of the mid-rise buildings besides the arterial road of a busy city, and against the backdrop of the night sky.

The expansion joints play an important role in such row houses.
But, do you know what are building 'expansion joints'?

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