The feasibility envelope answers the question the other way round. Give it the boundary RL, the driveway length and the slab you intend to pour, and it sweeps the platform levels the block can actually reach, returning the band that resolves under the rule pack you select — and the narrower band that resolves comfortably, without sitting on the limit.

Slab build-up is chosen from the usual residential thicknesses rather than assumed, and the garage door rebate is carried through, so the level you design to is the level the driveway has to meet.

DXF comes out as real geometry on named layers — profile, zones, grades, dimensions — at 1:1, 1:20, 1:50, 1:100, 1:200 or 1:500, so it references into the sheet at the scale it was drawn to instead of being traced.

Typeface, dimension terminators, RL decimal places and which annotations appear are saved as an export preset against your account, so the second driveway comes out matching the first. Kerb, footpath and verge sit outside the boundary as part of the same drawing, and the whole profile mirrors when the crossover is on the other side of the block.

Pick the vehicle and DrivewayIQ runs it across the profile from the road through to the slab, rolling the wheels over the surface so the body pitches the way it would on site. It names the point that comes closest — front overhang, underbody or rear overhang — the station along the driveway where it happens, and the clearance left at that point.

Approach and departure angles follow the construction published in SAE J689 — measured to a plane tangent to the tyre, not inferred from a quoted ground clearance. You can also put up to five people in the car and see how far the suspension settles, which is a physics-based estimate rather than a measurement, and is labelled as one in the app.

DrivewayIQ checks a profile against one of nine rule packs — AS 2890.1 as DrivewayIQ applies it, the same provisions applied more tightly, a steep-site pack, QDC NMP 1.1, the Brisbane, Ipswich and Logan City Councils, the South Australian Planning and Design Code, and ACT MIS 07 — and each pack is named and version-stamped on the result, so the interpretation behind a drawing is stated instead of assumed.

The check reports the worst rate of change over any one metre and the station it occurs at, rather than only comparing zone planes, and it audits the kerb, footpath and verge against the crossover limit separately from the driveway inside the boundary, because those are different pieces of land with different figures.