An excerpt from ATSSA:
The purpose of this final rule is to revise Standard, Guidance, Option provisions, and supporting information, relating to the traffic control devices
in all parts of the MUTCD to improve safety for all road users by promoting uniformity, and to incorporate new provisions that reflecttechnological
advances in traffic control device application. The MUTCD, with these changes incorporated, is being designated as the 11th Edition of the MUTCD.