Recycled, disposable bike helmets could solve bikesharing’s lack of institutionalized helmets. Another week, another adorable, well-composed video to encourage you to bike in some city, somewhere. This week: San Francisco Register your bike with the Metro Transit Police Department (please note that this is not the Metropolitan Police Department). Seattle’s guerilla bike lane is now the real thing. No cars go Image by Flickr user Joe in DC. Join our Flickr pool!