Extract from AS 2890.1 - driveway grades

27, AS/NZS 2890.1:2004

Transition
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Ramp | |

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Transition
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——\ Grade change
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he length of ramp, in metres

= height of ramp, in metres

Ramp grade — percent

The grade change is computed by subtracting one grade from the adjacent grade, both expressed as

percentages and taking account of algebraic sign which, for a given direction of travel, is either
uphill—positive or downhill—negative.

FIGURE 2.10 CHANGES OF GRADE ON RAMPS

2.6 DESIGN OF DOMESTIC DRIVEWAYS
2.6.1 Width

The minimum width of domestic driveways shall be 3.0 m. On curved driveways other than
at turns into garages or parking spaces the width shall be increased as given for domestic
property in Table 2.2. a

For apron widths at turns into enclosed garages, see Clause 5.4.

Minimum aisle or apron widths for turns into open sided parking shall be as for user Class |
or 1A requirements in Figure 2.2.

2.6.2 Gradients

The maximum gradient of domestic driveways shall be 1 in 4 (25%). The maximum
gradient of the associated access driveway across a property line or building alignment shall
be | in 20 (5%) and across a footpath as specified in Clause 3.3(d).

Grade changes across a footpath and within the property shall be designed and checked in
accordance with Appendix C to ensure that vehicles will not scrape their undersides when
negotiating them. Transitions may be required (see Clause 2.5.3(d)). Checks may be
required alone one or both edges of a driveway as well as along the centre line if there are
changes in the cross slope at or near a grade change.
NOTE: It is recognized that limiting domestic driveway grades to 25 percent maximum may not
be practicable in some particularly hilly residential locations. The services of a professionally
qualified person with appropriate experience may be required to make a judgement as to whether
a particular grade line design is safe and environmentally sustainable.

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