07/2398 - Traffic report · 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:

e Type BAR _ shoulder
(minimum treatment);

widening

¢ 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
turn movements from a through road to side
roads and local access points. It is detailed
in Figure 13.58.

‘¢ lt ts preferred that the widened shoukter is sealed, unless the shoulder can be
maintained with @ sound and everi surface.

A 100m s§

x 15.0m A

 

 

 

 

 

 

C= Onstraights  - 6.5m minimum

 

3

x

mr

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

 

- 7.0m minimum for Type | & 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= O5xVxF
3.6

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

V= Design speed of major road approach (km/h)

F= __ Formation/carriageway widening (m)

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

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

Figure 13.58 Basic Right Turn Treatment (BAR) on a Two Lane Rural Road

October 2006
13-95