Road Trip Pic of the Week, 12/16: What is this?

If you know what this is and where it's located, you could win a prize in the CNET Road Trip Picture of the Week challenge.

If you know what this is and where it was taken, you could win a prize in the Picture of the Week challenge. Daniel Terdiman/CNET

Update (Friday, 6:51 p.m. PST): The answer to this week's challenge--which an impressive 478 people got--is, of course, the vertical support cables of the Golden Gate Bridge, which connects San Francisco to Marin County. Thanks to everyone who played, and to all, please come back for next week's challenge.

That's a lot of red vertical lines and some very blue water behind them. But what are those lines, and where are they located?

If you know, you could win a prize in the CNET Road Trip Picture of the Week challenge.

If you have the answer, please e-mail it to me no later than 6 p.m. PT Friday (to daniel--dot--terdiman--at--cnet--dot--com, and PLEASE include "Picture of the Week" in the subject line). I'll choose a winner at random from among everyone who sends in the correct answer by the deadline. Please forgive me if you don't hear from me if you're not a winner. I get dozens of responses for each challenge.

Also, I've turned off comments because some people would post the correct answers there. I hate to shut down discussion, but I want you to figure out the answer on your own.

One caveat: no individual can win more than two prizes.

The Road Trip Picture of the Week challenge takes place each Thursday, and the photos could come from anywhere, not just Road Trip 2010 locations. Plus, they might be related to stories I've written in the past. So, please have fun playing today, and then come back each Thursday.

For most of the summer, Geek Gestalt was on Road Trip 2010. After driving more than 18,000 miles in the Rocky Mountains, the Pacific Northwest, the Southwest and the Southeast over the last four years, I drove 5,266 miles this summer looking for the best in technology, science, military, nature, aviation and more throughout the American Northeast. You can follow me on Twitter at @GreeterDan and @RoadTrip and find the project on Facebook.

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