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

Department of Main Roads
Road Planning and Design Manual

13.7.10 Right Turn Treatments -
Rural Conditions

There are two fundamental types of right
turn treatments for rural areas given in this
section:

* Type BAR shoulder widening
(minimum treatment);

© Type CHR pavement widening with a
right turn bay. A subset of this type is
the CHR(S). ©

Chapter 13
intersections at Grade

Generally these treatments are applied to
two-lane two-way rural roads.

13.7.10.1 Basic Right Turn
Treatment (BAR) on a Two-
Lane Rural Road

This is the minimum treatment for right
tum movements from a through road to side
roads and local access points. It is detailed
in Figure 13.58.

$11 bs preferred that the widened shouider le seated, uninea the shoulder can be:
Mainteined with @ pound and evan surface.

A 10.0m 3s

x 13,0m, A

 

 

 

 

  

 

 

rc
L

W= Nominal through lane width (m) (including widening for curves). Width to be continuous through the

intersection.

C= Onstraights - 6.5m minimum

+ 7.0m minimum for Type 1 & Type 2 Road Trains
On curves + widths as above + curve widening (based on widening for the design turning vehicle plus
widening for the design through vehicle)

A= QOS5xVxF
3.6

Increase length A on tighter curves. Where the design through vehicle is larger than or equal to a 19m semi-
trailer, the minimum speed used to calculate A is 80ksm/h.

V= Design speed of major road approach Qanv/h)

= Formation/carriageway widening (m)

S= Storage length to cater for one design turning vehicle (m) (minimum length 12.5m)

X= Distance based on design vehicle turning path, typically 10 - 15m

Figure 13.68 Basic Right Turn Treatment (BAR) on a Two Lane Rural Road

October 2006
13-96