BS 8442:2015 pdf free download Miscellaneous road traffic signs and devices – Requirements and test methods
4 lnformation and requirements to be agreed and
documented
4.1lnformation to be obtained from the purchaser
The following information shall be obtained from the purchaser when orderingto ensure products supplied are suitable for intended use:
a)the properties of the microprismatic material (see A.3.2.2);b) the level of protection against electric shock (see 12.1);
c)the degree of ingress protection required if it is higher than that specifiedin 12.2.1,12.3.1 and 12.4.1;
d)the length of a zebra crossing or refuge beacon post above ground(see 12.3.2.1 and 12.3.2.2);
NOTE This should be within the limits prescribed by the TSRGD [1].
e)the method of securing a flashing amber light unit to a post (see 12.4.1);and
f)the substrate to which sign face material is to be applied if other
than 3 mm aluminium sheet (see A.2.2).
5 Self-supporting rigid portable signs, other than
barriers
5.1General
The sign shall be constructed in such a way that, when erected, the lowest edgeof the sign, or of any supplementary plate, shall be not less than 300 mm abovethe supporting surface. The sign shall be so constructed that, when erected, thesign face is either normal to the supporting surface or inclined so that the topof the sign leans away from the viewer, at an angle not greater than 22.5° fromthe normal to the supporting surface when observed from the front.
NOTE 1 Retroreflective materials are designed to provide more reflected light todrivers when mounted vertically.
The sign assembly shall be designed to enable ballasting so that the sign resiststhe wind forces in its intended location.The sign assembly manufacturer shallindicate the minimum recommended ballast required, and its positioning on thesign assembly’s supports, for the sign assembly to resist the wind speed class(es)for which it is designed [see Table 1,14.1e) and Annex B].
The minimum recommended ballast required for the sign assembly to resist ClassA,Class B and Class C wind speeds shall be calculated using the methods
described in Annex C.
NOTE 2 Attention is drawn to the TSRGD [1] where the front of any backing boardor background against which the sign is displayed is required by the TSRGD [1] to begrey or yellow.
NOTE 3 Pressure due to passing vehicles is small by comparison and is not includedin the calculation of effective wind speed.A guide to wind speed classes is given inAnnex D.
5.2visual 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 to
specify.
5.3 Physical performance of the sign face
The physical performance of sign face material shall conform to A.4.5.4Physical 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;
b)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
6.1General
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
obstruction.
The barrier unit shall be constructed so as to allow the use of ballasting.The
manufacturer shall indicate the minimum recommended ballast required, and itspositioning on the barrier assembly’s supports,for the barrier assembly to resist
the 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 [11.
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.