| |
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Engineer
Grade
(silver/
white)
 |
High
Intensity
(silver/
white)
 |
Diamond
Grade
(silver/
white)
 |
Diamond
Grade
(fluorescent
Yellow)
 |
Diamond
Grade
(fluorescent
yel./green)
 |
|
| |
 How Bright Is the Sign? |
|
|
|
|
|
|
| |
 By 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%. |
| |
 At Night(for car or SUV) |
30 |
90 |
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. |
| |
| At 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. |
| |
| At Night (whenseen 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. |
| |
| How Durable is the Sign? |
7 years
(3M warranty discontinued) |
10 years |
10 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. |
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| Used for Stop Signs? |
 |
|
|
 |
|
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| 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. Prismatic Prismatic |
| |
| 3M Material Used for Signs |
3270 |
3930 |
4090 |
4081 |
4083 |
This is the typical material from 3M used for these types of signs. |
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| 3M Product Bulletin |
 |
|
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4000 Series
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