AS NZS 1906.3:2017 pdf free download – Retroreflective materials and devices for road traffic control purposes
1.3.1 Coefficient of luminous intensity (CIL)
The quotient, expressed in millicandela per lux (mcd/lx), obtained by dividing the reflected luminous intensity in the direction considered, by the illuminance at the retroreflective surface normal to the direction of the illuminating beam, for given observation and entrance angles. It is referred to as the ‘CIL value’ or R.
1.3.2 Entrance angle (β)
The angle between the straight line joining the reference point of the marker to the source of illumination and the retroreflector axis. In the CIE goniometer system, β is resolved into two orthogonal components, β 1 and β 2 , where β 1 lies in the (vertical) observation plane.
1.3.3 Flexural strength
The ability of a marker to resist fracture from deformation under load.
1.3.4 Illuminance at the retroreflective surface
The expression used conventionally to designate the illuminance produced by the source of light and measured in a plane perpendicular to the incident light beam and passing through the reference point.
1.3.5 Luminance factor
The ratio of the luminance of a surface to that of an ideal white diffusing surface when illuminated and viewed under the same conditions and viewing geometry. It is usually expressed as a decimal in the range 0 to 1. It may also be expressed as a percentage.
1.3.6 Marker body
The part of the marker that holds a retroreflective element in place or acts as the non-retroreflective marker.
1.3.7 Observation angle (α)
The angle between the straight line joining the reference point of the marker to the centre of the receptor (Y) and the straight line joining the reference point of the marker to centre of the source of illumination (see Figure 1.1). If the base of the marker is considered to be in a horizontal plane, the observation plane is vertical.
1.3.8 Reference direction
A line passing through the reference point, parallel to the longitudinal axis of symmetry,and lying in a plane parallel to the base of the marker.
1.3.9 Reference point
The centre of the surface carrying the reflective elements.
1.3.10 Retroreflective element
A minimal optical unit or lens that produces retro reflection, for example, a cube corner or biconvex structure.
1.3.11 Retroreflective marker
A device which produces an effective point source of light at normal highway viewing distances by reflecting incident light in directions close to the direction from which it came.
1.3.12 Snow plowable marker
A marker designed to be positioned in or on the road in such a manner that the blade of a snow plough will not strip it off the surface. The horizontal dimensions of such markers are commonly up to 320 mm in length and 230 mm width.
1.3.13 Temporary markers
A marker designed to be installed for a short period of time to provide delineation prior to the installation of permanent line marking and markers.
1.3.14 Terminal CIL value
The minimum CIL value observed among the best performing 80% of a sample of retroreflective markers which has undergone conditioning under traffic in specified conditions for a specified period of time.
1.3.15 Type acceptance
A term applicable to raised pavement markers which have gained conformance subsequent to additional testing as specified in Appendix B.