07/2398 - Revised Noise Report and cover letters to referral agencies [As Published] · 132007.2398

Department of Main Roads
Road Planning and Design Manual

 

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# Qouble barrier line not to be used
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Design Speed of Lateral Movement Length A Desirable
Major Road (m) Radius R
Approach (km/h) W7=3.5m W7=3.0m (m)
50 50% 40% 110
oo 60 so 175
70 70 60 240
80 80 65 280
90 90 75 350
100 100 85 425
110 110 95 500
120 120 100 600
(1) Based on a diverge rate of 1m (sec). If the through road is on a tight
horizontal curve, increase lateral movement length so that a minimal
decrease in speed is required for the through movement.
(2) Where Type 2 Road Trains are required minimum A = 60.0m

 

Nominal through lane width (m) (incl. widening for curves). For a new intersection on an existing road, the
width is to be in accordance with the current link strategy.

Nominal width of turn lane (m) (incl. widening for curves based on the design turning vehicle). Desirable
minimum = W, absolute minimum = 3m.

Tota! tength of auxiliary lane including taper, diverge/deceleration and storage (m).

Diverge/deceleration length including taper - refer to Table 13.11 (adjust for grade using the ‘Correction to
Grade' table in Figure 13.42).

Storage length (m), greater of: 1. The length of one design turning vehicle
2. (calculated car spaces —1) x 8m (refer to Appendix 13A of use computer
program eg. aaSIDRA)

Taper length (m) = 0,33 x iT
3.6

Design speed of major road approach (km/h)
Distance based on design vehicle turning path - typically 10 — 15m.

1, An alternative to the double white line on the offside edge of the right tum slot is a 1.0m painted median.
The 1.0m median is particularly useful when the major road is on a tight horizontal curve and oncoming
vehicles track across the centreline, Provision of this median will require the dimension ‘A’ to be increased.
2. A raised concrete median on the minor road may be used with this treatment to minimise ‘comer
cutting’, particularly for higher turing volumes.

Figure 13.60 Channelised Right Turn (CHR) on a Two Lane Rural Road

October 2006
13-99

Chapter 13
intersections at Grede