Highways compliance checks

The ✅ Checks tool measures the road network you have drawn or generated and judges it against a chosen design standard — with the results drawn straight on the plan, and reported as numbered, lettered sheets in the exports.

The compliance overlay (📐)

Pick Checks ▸ Compliance overlay in the palette. Colour-coded feedback appears on the plan — green pass, amber check, red fail — and a panel lists every finding, numbered. Click a row to zoom to it.

• Bend radii — every bend gets a badge with its measured centreline radius. Sharp 45–120° turns at kerb-return scale are judged as corners on their inner kerb radius; flowing curves are judged against the standard's bend minimum. A hard elbow with no radius is flagged with the largest fillet that would fix it.
• Visibility splays — the X × Y sight triangle at every junction, its Y edge following the kerb through curves. Houses, buildings, hedges, fences and street furniture inside a splay are flagged and outlined; shrubs and parking bays get an amber "keep it low / cars park here" note. A splay that leaves the site boundary is called out — that visibility relies on someone else's land.
• Turning spaces — dead ends longer than the standard's limit must have a turning space; hammerhead arms and turning-circle radii are measured against the design vehicle.
• Straight runs — road length before a bend or junction, against the standard's speed-control maximum.
• Junction spacing — centreline distance between adjacent junctions.
• Widths & shared drives — carriageway and shared-drive widths, and shared-drive length limits.

Choosing the standard

The Standard selector defaults to the site's preset (Durham-style / Manual for Streets / Compact). Pick Custom to edit every rule value — splay X and Y distances, bend and kerb minima, junction spacing, turning dimensions — and your figures are remembered on this device. Untick any check you don't want drawn. The standard you check against can deliberately differ from the preset you designed with.

In the exports

The planning report keeps the masterplan and sketch drawings clean — the analysis gets its own sheets. The report adds a Highways Compliance section: a key plan (the B&W sketch with only the checks drawn on it, every finding numbered, the problem areas boxed as lettered windows A, B, C…), a matching table (failed · warning · passed, each row keyed #7 · B), then close-up detail sheets — one framed view per area at readable scale, six to a page. The sheets are included whether or not the overlay is showing on screen.

DXF — Export DXF opens a dialogue; tick Include compliance views and the drawing gains the checks on their own CHK_* layers (fail red, warning yellow, pass green), the lettered area windows, and a 2× scaled detail view of each area in a grid beside the site plan, each framed and titled — the standard CAD detail convention, ready for markup.