BS 8442:2015 pdf download – Miscellaneous road traffic signs and devices – Requirements and test methods
5.2 visual performance of sign face material
The visual performance of the sign face material shall conform to A.3.
NOTE The retroreflective classes from which specifiers can choose characterizereflective performance when mounted vertically.However, temporary traffic signsare often ‘mounted non-vertically in use.The retroreflective performance of a signmounted non-vertically is lower than that provided if that same sign was installedvertically. As no method exists to test reflective performance in non-vertical
orientation, specifiers are encouraged to mount signs vertically whenever possible.Where non-vertical mounting is unavoidable, specifiers should take into account theresulting reduced reflective performance when determining the reflective class tospecify.
5.3 Physical performance of the sign face
The physical performance of sign face material shall conform to A.4.5.4 Physical performance of the sign assembly
When tested in accordance with Annex E, the sign assembly shall not:a)begin to overturn by rotating at the back of the base when the force isapplied from the front;
begin to overturn by rotating at the front of the base when the force isapplied from the back; or
slide along the surface if the force is applied in either direction.
6 Portable barriers
Barrier units, comprising barrier boards, tapping rails, supports and bases, shallbe capable of being incorporated into systems that are used to mark part of ahighway that is closed to traffic or to guide traffic or pedestrians past an
The barrier unit shall be constructed so as to allow the use of ballasting.Themanufacturer shall indicate the minimum recommended ballast required, and itspositioning on the barrier assembly’s supports, for the barrier assembly to resistthe wind speed class(es) for which it is designed [see Table 1,14.1e) and
Annex B].
NOTE 1 Barrier units incorporating traffic signs intended to close a traffic lane, orguide traffic or pedestrians past works,are regulated by the TSRGD [1].
NOTE 2 The minimum recommended ballast required for the barrier assembly toresist Class A,Class B and Class C wind speeds should be calculated in accordancewith Annex F
6.2Visual performance
The visual performance of any traffic sign incorporated into portable barriersshall conform to A.3.
6.3Physical performance
The physical performance of portable barriers shall conform to A.4.
7 Self-supporting flexible portable signs 7.1 General The self-supporting portable sign shall be constructed in such a way that, when erected, the lowest edge of the sign or of any supplementary plate shall be not less than 300 mm above the supporting surface. The sign shall be so constructed that, when erected, the sign face is either normal to the supporting surface or inclined so that the top of the sign leans away from the viewer at an angle not greater than 22.5° from the normal to the supporting surface when observed from the front.
NOTE 1 The self-supporting portable sign should be designed in such a way that ingress of moisture does not impair the photometric or colorimetric performance of the sign.
NOTE 2 Vertical mounting should be used as this improves the retroreflective performance of virtually all sign face materials. When tested in accordance with Annex E, the sign assembly shall conform to 5.4.
NOTE 3 The front of any backing board or background against which the sign is displayed is required by the TSRGD [1] to be grey or yellow.
7.2 Visual performance The visual performance shall conform to A.3. 7.3 Physical properties of substrate material The properties of the substrate to which the sign face is applied shall conform to the properties specified in Table 2, when tested in accordance with the relevant standards specified in Table 2.
NOTE 1 As these signs are generally transported and stored folded or rolled, the performance and legibility of the sign should remain intact after being transported.
NOTE 2 Substrate material is not required to conform to A.4.