Type 4 Object Markers - OM4-1
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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
Sign Specifications
MUTCD Code
OM4-1
Sign Type
Object Marker
Shape
Rectangle (Vertical)
Standard regulatory sign shape
Colors
Yellow background
Black legend
Compliance
MUTCD Compliant: Type 4 Object Marker per Section 2C.66. Marks raised islands and medians.
| Size | Dimensions | Application |
|---|---|---|
| StandardDefault | 18x18" | Raised islands |
MUTCD Compliant
Federal standards
DOT Approved
State & Federal
ASTM D4956
Type III/IV/XI
10+ Years
Durability
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 on raised channelizing islands, medians, and refuge areas. Yellow retroreflective.
MUTCD Reference: Section 2C.66
Often Paired With
Signs commonly installed together per MUTCD guidelines
