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T.P.D.M.V.2.3
(Al/2001)
(b) For 80 km/h design speed, a 3 m width clear of obstructions must be maintained,
the width being measured as in (ii)(a) above.
(iii)
Roads having design speeds of 80 km/h or greater, and the radius of the bend is R3 or
greater
(a)
For a 100 km/h design speed or greater, a 4 m width in accordance with (ii)(a)
above, or a width determined from Table 3.3.5.1 measured in accordance with
paragraph 3.3.5.2, whichever is the lesser, must be maintained free of
obstructions.
(b) For 80 km/h design speed, a 3 m width in accordance with (ii)(b) above, or a
width determined from Table 3.3.5.1 measured in accordance with paragraph
3.3.5.2, whichever is the lesser, must be maintained free of obstructions.
(iv)
Roads having design speed of 50 km/h
This design speed in accordance with Table 3.3.2.1 is only appropriate for single
carriageway roads and therefore sight distances in accordance with Table 3.3.5.1 must
be provided.
3.3.5.5 Large direction signs, gantry supports or other substantial obstructions should be sited such
that they do not obscure sight lines, although isolated slim objects such as lamp columns, or
sign posts can be ignored. Laybys should wherever possible be sited on striaight or the
outside of curves where stopped vehicles will not obstruct sightlines.
3.3.5.6 For information on, visibility splays required at priority junctions, visibility requirements at
roundabouts, and visibility requirements at grade separated interchanges, Sections 4.3.8,
4.5.11, and 4.6.6, respectively, of Chapter 4 in this Volume should be consulted.