Merge Left Arrow Sign - W4-1L
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Choose Your Reflectivity Grade
Compare visibility, durability, and ideal applications
Engineering Grade
Ideal Use
Parking lots
Brightness
General Lifespan
7 years
Night-time Visibility
500 feet away
High Intensity Prismatic
Ideal Use
Roadways
Brightness
General Lifespan
10 years
Night-time Visibility
1000 feet away
Diamond Grade
Ideal Use
High-speed roadways
Brightness
General Lifespan
10+ years
Night-time Visibility
1500 feet away
Product Details
Merge Left Arrow Sign - W4-1L
The W4-1L Merge Left Arrow Sign provides critical traffic guidance for drivers navigating complex roadways and intersections. Constructed on standard aluminum blanks with reflective surfaces, this sign ensures maximum visibility during day and night conditions. Available in high intensity and diamond grade reflective options, the sign fully complies with Department of Transportation (DOT) and Manual on Uniform Traffic Control Devices (MUTCD) state and federal standards. Its clear, concise design helps reduce potential accidents by providing drivers with immediate and unmistakable directional information at key merging points.
Sign Specifications
MUTCD Code
W4-1L
Sign Type
Warning Sign
Shape
Diamond
Standard warning sign shape
Colors
Yellow background
Black legend
Compliance
MUTCD Compliant: This merge/lane transition warning sign meets federal standards per MUTCD Section 2C.38. Used to warn of lane changes ahead.
| Size | Dimensions | Application |
|---|---|---|
| Minimum | 30x30" | Low-volume roads |
| StandardDefault | 36x36" | Conventional roads |
| Expressway | 48x48" | Expressways and freeways |
MUTCD Compliant
Federal standards
DOT Approved
State & Federal
ASTM D4956
Type III/IV/XI
10+ Years
Durability
Engineer Grade (EG)
Type: ASTM Type I
Lifespan: 5-7 years
Brightness: ~50 cd/lux/m²
Parking lots, low-speed areas, non-critical signage
High Intensity Prismatic (HIP)
Type: ASTM Type III/IV
Lifespan: 10 years
Brightness: ~360 cd/lux/m²
Traffic signs, work zones, roadways
Diamond Grade (DG3)
Type: ASTM Type XI
Lifespan: 10-12 years
Brightness: ~580 cd/lux/m²
Critical signs, freeways, overhead signs
Install in advance of merge point or lane transition. Placement distance per MUTCD Table 2C-4.
MUTCD Reference: Section 2C.38
Often Paired With
Signs commonly installed together per MUTCD guidelines
