A bet in the town of Laguna Nigel, CA lead to a 30-year tradition of dropping trou and letting it all hang out for passing Amtrak trains.
The BBC reports that 10,000 visitors bare their butts each year. Last year things got too rowdy, so the city attempted to dissuade possible mooners, broadcasting that the city was "saying 'NO' to crack". The moonings have continued unabated, and have their own official website, http://www.moonamtrak.org/, which is officially SFW and includes train times for your convenience.
FULL STORY: Californians bare bottoms for passing trains

Planetizen Federal Action Tracker
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Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
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Central Transportation Planning Staff/Boston Region MPO
Heyer Gruel & Associates PA
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Harvard GSD Executive Education
Regional Transportation Commission of Southern Nevada
Toledo-Lucas County Plan Commissions