Ghost Bike memorials are installed by biking enthusiasts to remember those who have been killed while biking. While there are ghost bikes all over the US, there is no cohesive effort or official organization that oversees the movement. The website ghostbikes.org provides information, however since 2012 the site is only updated for NYC. The site claims that “Anyone can make and install a ghost bike, you don’t need permission from anyone to do so.” But, not all cities/governing agencies allow ghost bikes, and some have even removed ghost bike memorials.
There is no national law governing roadside memorials. Therefore, it is very important to check with city and county officials before attempting to install a ghost bike. The FDOT prohibits installing ghost bikes on state right-of-ways; they are to be kept clear for utility workers, maintenance, etc. The FDOT has its own Memorial Marker program (which is free to the public, but does involve an application process): https://www.fdot.gov/maintenance/memorialmarkers.shtm.
The bike should be installed where it does not interfere with pedestrian or vehicle traffic and should not be attached to public works or private property (there may be additional local restrictions). Maintenance of the site (repaint bike, remove trash, etc.) may be required by local ordinances but it is also highly recommended to maximize the effectiveness of raising awareness of the issue well into the future. Individuals and groups may wish to donate materials such as the bike, paint, chains and locks, memorial plaque. Many groups who install ghost bikes also organize vigils and memorial rides.
Instructions for the creation and installation of ghost bikes can be found here: http://ghostbikes.org/howto.