Google Street View back in town

Google’s famous Street View cars are circling Philadelphia, spotted this morning at 15th and Arch streets and in South Philadelphia later today at 9th and Bainbridge.
What gives?
As Google spokesperson Anne Espiritu tells us by email:

We’re excited about re-driving in the Philly area to provide both locals and visitors of Philly with refreshed street-level views. Updating imagery is something that we do from time to time as part of our effort to provide our users with the richest, most up-to-date maps possible.

A video about how the cars are designed, by Google, below.
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