CFR › Title 23 › Part 655Part 655 — Traffic OperationsSubpart F — Traffic Control Devices on Federal-Aid and Other Streets and Highways§ 655.601— Purpose.§ 655.602— Definitions.§ 655.603— Standards.§ 655.604— Achieving basic uniformity.§ 655.605— Project procedures.§ 655.606— Higher cost materials.§ 655.607— Funding.