M4-5P (To (plaque)) is an official MUTCD traffic sign designation within the route markers sign family. Standard vector graphics are published by FHWA under Standard Highway Signs.
M4-5P is the TO plaque used in route guidance. In an assembly, TO distinguishes directions leading toward a route from signs that identify the route being traveled; the message only becomes complete when read with its associated route marker and directional information.
What to verify
Confirm the route number, destination and turn direction as one assembly. A standalone TO plaque is not enough to convey a route, and state-specific route marker practices may affect the final layout.
For further context, read the related MUTCD guide and compare the official FHWA MUTCD. This independent reference does not replace engineering judgment or applicable state requirements.
