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See the Difference at Night
In daylight, 3M reflective sheeting grades can look very similar. At night, the difference is dramatic. The photo compares Engineer Grade on the left, High Intensity Prismatic in the center, and Diamond Grade on the right under headlight illumination. For higher-speed roads, critical intersections, and locations where nighttime visibility matters most, Diamond Grade provides the brightest, most visible sign.
Detour Left Sign (M4-10l)
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Detour Left Sign M4-10l guides drivers along a temporary detour route around a closure, work area, or unavailable roadway. Choose the available configuration that fits the installation and visibility requirements.
- .080″ 5052-H38 Alodine-treated aluminum
- Available sizes: 48″ x 18″
- 3M reflective sheeting: Engineer Grade, High Intensity Prismatic, and Diamond Grade DG3
- Pre-punched 3/8″ mounting holes; larger signs use four mounting holes
- Standard federal radius corners
The Detour Left Sign guides drivers along a temporary detour route around a closure, work area, or unavailable roadway. Standard construction includes pre-punched 3/8" mounting holes; larger signs use four mounting holes, and standard federal radius corners.
The left-oriented version matches installations where the directional message or symbol must point to the left. The sign is produced on .080" 5052-H38 Alodine-treated aluminum. Available sizes include 48" x 18". Premium 3M reflective sheeting options include Engineer Grade, High Intensity Prismatic, and Diamond Grade DG3. Choose the reflectivity level for the nighttime visibility needs, installation environment, and project or agency specification.
MUTCD Part 6 addresses temporary traffic control for work zones, including construction, detour, lane-closure, and worker-warning applications. Final selection, size, placement, and installation for an official public-road application should be confirmed against the applicable MUTCD provision and the agency with jurisdiction.
Before installation, confirm the required sign size, mounting location, support, orientation, and local requirements. Matching posts, brackets, and installation hardware can be selected separately.
Additional information
| Dimensions | N/A |
|---|---|
| Size | |
| Reflectivity | Advanced Engineer Grade Prismatic (AEGP) – ASTM Type I, High Intensity Prismatic (HIP) – ASTM Type III, ASTM Type IV, Diamond Grade (DG3) – ASTM Type XI |
Outsmart the Dark with 3M Diamond Grade DG3 Reflective Sheeting
Where Diamond Grade Makes the Biggest Difference
Some locations are more challenging for drivers because road conditions or layout can leave less time to react. 3M Diamond Grade DG3 is engineered to return more light from vehicle headlights back toward the driver, helping signs stand out sooner and from farther away. It's an ideal choice for:
Sharp curves and blind corners
Hills and winding roads with limited sight distance
Hidden or unexpected intersections
Warning signs that are easy to overlook
Watch the video to see how Diamond Grade can improve sign visibility in higher-risk locations.
Video courtesy of 3M.
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