MUTCD W8-10 - Bicycle slippery when wet. From: Manual on Uniform Traffic Control Devices for Streets and Highways - 2003 Edition.

Licensing

This file is in the public domain because it comes from the Manual on Uniform Traffic Control Devices , sign number W8-10, which states specifically on page I-1 that : Any traffic control device design or application provision contained in this Manual shall be considered to be in the public domain . Traffic control devices contained in this Manual shall not be protected by a patent, trademark, or copyright , except for the Interstate Shield and any other items owned by FHWA.