Stop Sign and Parking Sign Material Specifications

Arrow Right Image Let's Compare Stop Sign and Parking Sign Materials.
  Engineer Grade
(silver/
white)
High Intensity
(silver/
white)
Diamond Grade
(silver/
white)
Diamond Grade
(fluorescent
Yellow)
Diamond Grade
(fluorescent
yel./green)
 
close up of engineer grade close up of high_intensity close up of diamond grade Closeup Diamond Grade Yellow Closeup Diamond Grade Green
Arrow First Image How Bright is the Sign?            
Sun ImageBy Day 27 34.8 40 45 60 This measures a sign "Cap Y" Value, a common way to determine how dull or bright the sign is during the daytime. Shown here is the minimum Daytime Luminance Limit y%.
Moon ImageAt Night
(for car or SUV)
30 95 400 240 320 This measures, approximately, the reflectance of a sign, when seen by the driver of a car or SUV. For the car, the reflectance is higher, for an SUV, the reflectance is lower. In particular, the amount shown here is the coefficient of retroreflection as measured in candelas per footcandle per sq ft at an observation angle of  0.5º  and an entrance angle of -4º.
Moon ImageAt Night
(for a truck)
10 120 72 96 Like above, but the values here approximate the reflectance of the Stop sign for a driver of a truck. Note, however, that a truck typically observes a sign at an angle of 0.8º and the measurements here are actually at an observation angle of  1.0º  and entrance angle of -4º.
Moon ImageAt Night (when
seen at an angle)
30 175 215 130 170 Many times a stop sign is seen at an angle. The values here are  the measurements here are actually the  candelas per footcandle per sq ft for the stop sign at an observation angle of  0.3º  and entrance angle of +30º.
Arrow First Image How Durable is the Sign? 7 years
(3M warranty discontinued)
10 years 12 years 10 years 10 years This is the 3M Warranty period. In practice, many signs last longer. Yet, in certain climates, your sign may degrade at a faster rate.
Used for Stop Signs? Tick Image Tick Image Tick Image Tick Image Tick Image  
Arrow First Image Retroreflective Sign Element Beads Prismatic Prismatic Prismatic Prismatic There are two basic technologies used for reflective stop signs or other parking signs – glass beads or prisms.
Arrow First Image 3M Material Used for Signs 3270 3930 4090 4081 4083 This is the typical material from 3M used for these types of signs.
3M Product Bulletin Pdf Image Pdf Image Pdf Image4000 Series

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