Roadway design toolkit
From roadway curve
to CAD-ready deliverable.
Superelevation calculations, LandXML review, station-aware lane profiles, and engineering exports—built for the way roadway designers actually work.
No account Local processing Shared Python engine
PC 125+42.18FULL SUPERPT 129+86.72
SECTION @ 127+64.45
+6.0%CL−6.0%
RATE e0.0600RUNOFF180.00′RUNOUT60.00′
Alignment geometry · lane events · transition limits
INPUTLandXML + curve data
→CALCULATETransitions + lane slopes
→DELIVERPDF · ORD CSV · DXF
One focused workspace
Engineering context stays connected from input to export.
Keep curve geometry, calculation criteria, lane events, notes, and deliverables together instead of rebuilding the same information across disconnected tools.
- 01Load or enterSelect a LandXML alignment or key in a curve.
- 02Calculate and reviewSee transitions and signed slopes update automatically.
- 03Export with contextCreate review-ready files from the recorded results.
Superelevation CalculatorPRIVATE ENGINE READY
03 / RESULTS
CRITERIA RECORDEDLEFT LANEFULL SUPER127+64.45+6.00%
RIGHT LANEFULL SUPER127+64.45−6.00%
REVIEW & EXPORTPDF reportORD CSVOverlay DXF
Capability map
Purpose-built for roadway geometry—not generic math.
Curve calculations
Calculate rate, runoff, runout, transition stations, and signed lane slopes from practical roadway inputs.
LandXML intelligence
Read alignments, lines, circular arcs, units, curve direction, and station equations without rekeying geometry.
Lane-by-lane review
Inspect critical events for both lanes and look up the slope at a station—or the station for a target slope.
Portable projects
Save calculation provenance, curve collections, notes, and embedded alignment context in a reusable project file.
Coordinate-aware DXF
Create real-coordinate overlays with curve callouts, lane labels, stationing, and East/West zone transformation.
One shared engine
Use the same Python calculation and export modules on Windows, macOS, and in the browser.
Deliverables
Move from calculation
to design review.
Every export uses the same recorded calculation results shown in the application.
Calculation report
01Curve inputs, transition stations, lane slopes, notes, and version provenance.
OpenRoads handoff
02ORD-compatible lane, station, cross-slope, pivot, point, and transition fields.
Real-coordinate overlay
03Alignment geometry, station callouts, lane leaders, slope labels, and coordinate transforms.
LOCAL
Local by design
Your project files stay on your device.
The browser edition runs the shared Python engine inside your tab. LandXML, calculations, saved projects, and exports are processed locally—without an account or calculation server.
Choose your workspace
Desktop when you want it.
Browser when you don’t.
Download the portable desktop application or start immediately in your browser.
WINDOWS 10 / 11 · x64
Windows
Portable desktop executableDownload EXE ↓MACOS 15+ · NATIVE BUILDS
macOS
Choose your Mac processorMODERN DESKTOP BROWSER
Browser
No installation or accountOpen calculator ↗Validate criteria, stationing, coordinate systems, lane naming, and exported geometry against governing standards and the project design file.