M4-9a — End Detour
Overview
The M4-9a End Detour sign is a guide sign that marks a detour route. It marks an approved detour route around a closure.
Requirements
Placeholder requirements for the M4-9a. Document the conditions under which this sign is required, applicable regulatory language, and common compliance failures associated with it.
- Placeholder requirement one.
- Placeholder requirement two.
- Placeholder requirement three.
Placement & Installation
Placeholder placement and installation guidance for the End Detour. Cover advance-warning distances, mounting height, lateral offset, and spacing relative to the work area and posted speed.
Dimensions & Specifications
| Application | Standard Size |
|---|---|
| Standard | 30 x 24 in |
| Minimum | 24 x 18 in |
MUTCD Reference
MUTCD § 6F.51. Governed by MUTCD § 6F.51. Work-zone signs follow MUTCD Part 6 (Temporary Traffic Control); the sizes shown are the standard Part 6F values — confirm the size for your roadway and the current California MUTCD.
This page provides general educational information only. It is not legal advice, engineering advice, or agency approval. Requirements vary by jurisdiction, project type, agency, roadway, permit condition, and approved plan.
