The information contained herein reflects the new and revised sign designs that have been adopted in the 2009 Edition of the Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD). This Supplement serves as an interim update until a new edition of the Standard Highway Signs and Markings publication is released at a future date. The sign designs contained in this Supplement will be incorporated into the new edition of Standard Highway Signs and Markings. The new edition, currently in progress, will contain expanded sign design guidelines, the Standard Alphabets, and updated information for standard arrow designs, pavement markings, and symbolic traffic control signal indications.