Traffic Signs Manual Chapter 4 Warning Signs

Diagram 520 “Dual carriageway ends ahead” – see 5.1

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2.4.2
Diagram 520 “Dual carriageway ends ahead” – see
5.1
Diagram 521 “Two-way traffic” – see
5.1
(iii) When used on any road:
Diagram 522 “Two-way traffic on route crossing ahead” – see
5.2.2

Diagram 558 “Low-flying aircraft” – see
13.1.2
3. The combined metric/imperial height restriction warning triangle (diagram 530A) incorporated into a
directional sign or the sign to diagram 818.5 (see
Figure 7-9
and Appendix D in Chapter 7) is 30 stroke
widths in height. The combined metric/imperial height restriction roundel (diagram 629.2A) incorporated
into a directional sign or a sign to diagram 818.4 (see
Figure 7-2
and Appendix D in Chapter 7) is
30 stroke widths in diameter. The table below sets out recommended x‑heights and corresponding
triangle heights and roundel diameters for the signs to diagrams 818.4 and 818.5, appropriate to various
85th percentile speeds. The dimension in brackets applies where motorways and all‑purpose dual
carriageway roads have three or more lanes per carriageway. For appropriate x‑heights for directional

87
APPENDIX
signs, see Appendix A in Local Transport Note 1/94 ‘The Design and Use of Directional Informatory
Signs’, available from TSO or
www.gov.uk/government/collections/local‑transport‑notes
.
Table A-3 Recommended x‑heights for signs to diagrams 818.4 and 818.5 (S12‑28‑22 & 23)

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