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ASTM E1709-00e1

Historical Revision

Standard Test Method for Measurement of Retroreflective Signs Using a Portable Retroreflectometer at a 0.2 Degree Observation Angle

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1.1 This test method covers measurement of the retroreflective properties of sign materials such as traffic signs and symbols (vertical surfaces) using a portable retroreflectometer that can be used in the field. The portable retroreflectometer is a hand-held instrument with a defined standard geometry that can be placed in contact with sign material to measure the retroreflection in a standard geometry. The measurements can be compared to minimum requirements to determine the need for replacement. Entrance and observation angles specified in this test method are those used currently in the United States and may differ from the angles used elsewhere in the world.

1.2 This test method is intended to be used for the field measurement of traffic signs but may be used to measure the performance of materials before placing the sign in the field or before placing the sign material on the sign face.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.


Measurements made by this test method are related to the night time brightness of retroreflective traffic signs approximately facing the driver of a mid-sized automobile equipped with tungsten filament headlights at about 200 m distance.

Retroreflective material used on traffic signs degrades with time and requires periodic measurement to ensure that the performance of the retroflection provides adequate safety to the driver.

The quality of the sign as to material used, age, and wear pattern will have an effect on the coefficient of retroreflection. These conditions need to be observed and noted by the user.

This test method is not intended for use for the measurement of signs when the instrument entrance and observation angles differ from those specified herein.

SDO ASTM: ASTM International
Document Number E1709
Publication Date July 10, 2000
Language en - English
Page Count 5
Revision Level 00e1
Supercedes
Committee E12.10
Publish Date Document Id Type View
July 1, 2016 E1709-16E02 Revision
July 1, 2016 E1709-16E01 Revision
July 1, 2016 E1709-16 Revision
July 1, 2009 E1709-09 Revision
Feb. 1, 2008 E1709-08 Revision
July 10, 2000 E1709-00E01 Revision
July 10, 2000 E1709-00 Revision
Feb. 1, 2022 E1709-16R22 Reaffirmation