Attribution method: Link to this page, on any Wikimedia Foundation website, and to the license, GFDL. Software: Potrace and Inkscape .41 (Linuxerist) Notes: I redid this using Potrace, then did a little editing in Inkscape.
Bicycle icon.gif (US Dept. Trans, Public Domain)
Authors: Linuxerist, jareha and US Government

This image was either created, or made in part by me, Linuxerist. It was probably made in Inkscape version .41. Its license is below.