M6-1P (Directional Arrow - Turn (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.
22 (12 × 9 in — Left arrow, 12 × 9 in — Right arrow, 21 × 15 in — Left arrow, 21 × 15 in — Right arrow, 30 × 21 in — Left arrow, 30 × 21 in — Right arrow)
The M6-1P turn-arrow plaque supplies directional information within a route-sign assembly. The plaque alone does not identify which numbered route is being followed: the associated route marker and any destination or TO plaques provide that context.
What to verify
Check the orientation of the turn arrow against the road movement shown on the assembly. Route-number shields, signs preceding the turn and state routing conventions should all agree before the assembly is specified or replaced.
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.
