# Road.Engineering > Road.Engineering is a browser-based road analysis app for civil and traffic engineers. > Work on a map to review terrain, sight distance, routes, vehicle turns and crash data. > The tools assist engineering judgement. Results need review by a qualified engineer. Last updated: 2026-10-10 This is an AI-readable index. For current controls, workflows and troubleshooting, read https://road.engineering/llms-full.txt. Do not invent controls, coverage or tool URLs. The human copy/download page is https://road.engineering/ai. ## Navigation and access Signed-out visitors see the landing page; signed-in users work in one map view. Main tools open from the map toolbar, with results in dockable panels. Up to four tools can be open; the focused tab receives map clicks. Measurement tools pause open tools and preserve work. Projects open from the header project menu (folder button on phones), with Recent, search, View all projects and New project. Project Layers in the sidebar manages imports. Free accounts can explore the map, crash layers, elevation coverage and basic measurements, and own up to two projects. Main toolbar tools currently require Professional access, including Point Elevation and Elevation Profile. Professional is AUD $299 per month, GST inclusive; new accounts currently start with a 7-day Professional trial, no card needed. The signup trial returns to Free automatically unless you subscribe. Checkout offers a 7-day free trial with a card if you have not used it before. Founding customer price. Subscribe by 30 June 2027 and your price is held for your first 12 months, even if our list price rises. After that, any price change comes with at least 30 days notice. Professional includes unlimited projects, file uploads and editor sharing. Enterprise is arranged through sales. Held buttons do not open on any plan. Elevation use has no monthly point allowance; fair use applies under the Terms. Elevation Profile and Contours keep toolbar menus, unfinished parameter edits and tab focus in place while their panels update. ## Tools ### Point Elevation Click or drag points to read ground elevation and source details. Export CSV or JSON. ### Elevation Profile Draw and finish a path to see terrain, a sample table and chart markups. Sample spacing and sight-distance Parameters are panel controls. Clear Profile also stops a refresh that is still running. Export PDF, PNG, CSV or JSON. ### Contours Draw a boundary to generate contours, drainage flow, slope shading and a 3D terrain view. Adjust intervals and display controls; export PDF or PNG. ### SISD Place the conflict point, minor vehicle, braking point and major vehicle to review intersection sight distance. Select Vehicle, Speed and applicable parameters; save/load with a project and export results. ### ASD Place the intersection, braking point and vehicle to review approach sight distance. Edit Vehicle, Speed, grade and advanced parameters; save/load and export results. ### Device The Device button opens Device Visibility. Choose the device (a roadworks sign, a sign on a post, a variable message sign, an arrow board, a portable traffic signal, a traffic controller, a signal head or another device) and click where it stands: a dashed circle shows the required distance. Then click back along the road the driver comes from, on or beyond the circle. A device gives an editable starting face height and required distance where it has them (other device needs a height; a signal head and other device use seconds or a distance you enter); the speed is detected, estimated or entered. It reports how far back drivers have an unbroken view of the device against the required distance, and the ground or placed object that limits it. It gives no pass or fail verdict, and a result that could not be reached is never a pass. Vegetation, barriers, plant and vehicles count only where placed as objects. Use Chart, Table or the 3D tab, drag either marker to update the result, save/load with a project and export PDF or CSV. ### Queue The Queue button opens Queue Visibility. Place a stop point and a far point back along the road, check speed and the lane offset (0 m follows the road line). It reports the longest queue with available sight distance and the limiting terrain, allowance, coverage or queue-range boundary for car and truck checks. Each vehicle has two named checks: A, the roadworks check (queue sight distance for temporary traffic control, filled from the approach speed), and B, the general check (stopping sight distance to the back of any queue, for example one back from traffic signals). The Queue type control switches between Roadworks (the default, both checks) and Signalised intersection, which shows the general check only, at the approach design speed (posted speed plus 10 km/h, editable) with an urban or rural reaction time (editable). It gives no overall pass or fail verdict and predicts no queue length. The Speed control sets the speed along the approach: Posted zones (the default) reads the mapped speed zones, Operating speed uses the modelled operating speed with posted zones where the model gives none, and One speed uses the entered speed everywhere. Each queue end uses the highest speed found within its required distance behind it; the approach chart shows the speeds and their sources, and a note says where no mapped limit is known and the single speed was used, or where the modelled speed is below the posted limit. Use Chart/Table and select a result to inspect its limit, and export PDF or CSV. On the map the road is coloured for the selected check: green where the required distance is available, amber where it relies on the elevation allowance, red where the sight line ends before it and grey where measurement coverage is missing. There are no traffic or queue-estimate inputs. Cut/Fill on the approach profile tests rebuilt ground (results and exports mark it as assumed and list the spans); hover or select a queue position to see required and available sight lines. ### SSD Place the object/hazard, braking point and vehicle to review stopping sight distance. The required distance is shown as calculated, to 0.1 m. Every sight distance check (SSD, ASD, SISD, CSD, Queue, Route Analysis and the Elevation Profile readout) shows required and available distance to 0.1 m and compares those two numbers. Edit Vehicle, Speed, grade and advanced parameters; save/load and export results. Show working, beside the result, lists the inputs, the calculation with the numbers in it, available against required distance and the source of each value; the PDF includes it. SSD, ASD and SISD parameters offer a few presets plus Custom entry within shown bounds; CSD offers this for driver eye height, and Queue Visibility for eye height, reaction time and deceleration. Older saved values load unchanged and show as Custom. ### MGSD (Coming Soon) ### CSD Place the crossing and approach points prompted by the panel. Opposite approach (O) adds another approach with its own chart and result. Edit crossing parameters (for a child or a cyclist, type your own values); save/load and export by approach. Sight-line results are aids, not certification. ### Route Analysis Choose route waypoints; review Horizontal, Vertical, Op Speed, SSD, Slope/X-Section, Results and 3D. The 3D view can stay in its tab, sit in a panel left or right of the map, or swap places with the map; a map click beside the route selects that station in 3D. Its tools: camera views (driver eye, target eye, along the sight line, side, top down, free orbit; keys 1 to 6), a readout of the SSD result for the sight line pointed at, Measure (distance, height above ground, clearance to ground and objects), a terrain grid or contours, vertical exaggeration 1 to 3 times, and a PNG snapshot with imagery credits. It shows a band of terrain along the road (100, 300 or 600 m wide, finest at the road and fitted to the road profile there), the alignment, the SSD sight lines in the map's colours, vehicles at the selected station and a drive-through at operating speed with any Swept Path vehicle (car to road train) seen from a chase camera, its trailers tracking as the Swept Path tool computes and its swept ground as an optional band; the view says when the speed is above the low-speed turning model. Save/load routes; export tab results, alignment CAD and corridor sections. Queensland road chainage and traffic-count lookups can be unavailable; the RA CH switch on the Horizontal tab then stays visible, switched off, and gives the reason. A saved project's Queensland chainage is checked again when the project opens. On a short map the on-map controls fold behind one Map controls button to keep the slope legend on screen. If terrain or posted speed limits cannot be loaded, a notice appears with a Retry button; limits inferred from the road class rather than read from a tagged limit are flagged. Stretches with no elevation data are hatched on the profile, counted and left out of the elevation figures. Crossfall is positive when banked into the curve, in both directions. When crossfall is missing, the model assumes 3 percent adverse crossfall (the lane falling away from the curve) and shows that value as assumed. ### Swept Path Select a vehicle, speed/minimum radius, Design or Check role, envelope and clearance. Add points with Automatic or Set radius turns; finish with Enter or Stop. Inspect the simulation and animation. Results state the tightest path radius beside the vehicle minimum and the peak steering. Export PNG, PDF or DXF with vehicle, turn and credit details. ### Cross-Section (Coming Soon) ### Crash Analytics Filter recorded crashes in QLD, NSW, VIC, ACT, SA, TAS and NZ; draw an area and explore charts and records. Export records or a landscape PDF report; chart-copy actions use the clipboard. Custom analysis also exports its table as CSV and its chart as an image file. Regions record different fields and cover different years. Severity is labelled Fatal, Serious injury, Moderate injury, Minor injury and Property damage only in every region; this is a common display scale, and each source's own term is shown on hover, focus or tap and in its own export column. If the full set of crashes for a drawn area cannot load, a notice on the map offers Retry. Filters show loading progress and offer Retry if options cannot be reached; retry loads current options and keeps selections while a region is unavailable. ### Volume Analysis (Coming Soon) ### Aquaplaning Click a point to trace drainage and estimate water film depth. Set site context, rainfall and texture, and change the prefilled water film depth limits if the site needs it; inspect the chart and optionally set a path end. Export PDF or CSV. Missing ground data can leave the check unassessed; a traced path is not a full drainage model. ## Other controls, accounts and data The measurement toolbar offers distance, radius, circle, grade, area, spot elevation, posted speed, property information and AADT Check for Queensland state-controlled roads. Paid access is needed for grade, spot elevation and AADT Check. Road Chainage (QLD) in Map layers adds chainage ticks and kilometre labels on state-controlled roads. These Queensland features are paid. SSD, ASD, SISD, CSD, Queue, Device, Swept Path and the Elevation Profile sight distance readout each have a 3D tab that draws the last result on terrain and never works it out again: sight lines coloured by result (meets, marginal, below required, with a dot where a blocking point is recorded; grey with its reason where not assessed), the driver and target, and placed objects. It can stay in its tab, sit beside the map or swap with it, and has the camera views, readout, Measure, view settings and Snapshot of the Route Analysis 3D view. Drag the driver or target ring in 3D (or D, arrow keys, Enter) and the tool runs again as after dragging the map marker. Swept Path shows each unit at its simulated position, with Play (Space). Every 3D view with sight lines also has Section (T: a cut along the sight line in focus, opened as a chart equal to the tool's own), Objects (O: the result with and without placed objects, the view without them marked What-if and never replacing the saved result) and Labels (B: chainage markers and a ring of the required distance around the driver). In the Route Analysis drive, pick the drive speed in the playback bar: Operating speed, Posted, Posted plus 10 km/h or a typed speed; it is display only and the readout names it. Objects on the map toolbar (paid) places vehicles, trees, signs, people or a custom box: pick a kind, click the map, then move, turn, resize, rename or delete it. Fences, barriers, a vegetation line and a wall are drawn as a line: click along it, double-click or press Enter to finish, then drag its points and set its height. Undo restores a deleted object. Objects are saved with the open project and show as footprints and lines on the map and as solids in the 3D views. Sight-line checks (SISD, ASD, SSD, CSD, Queue, Device and Route Analysis) treat each object marked as blocking sight as a solid standing on the ground, from the ground to its height, name the object that blocks a line in the result and exports, and say when a result predates a change to the objects. Run the check again after changing objects. An object that cannot be tested leaves the line not assessed, never clear. What’s new in the header lists recent changes; Show me highlights the related control (for Projects changes, the project button in the header); select it to open the tool or area. The public history is https://road.engineering/changelog. Account settings include Profile, Security, Subscription and Preferences. Sign in with Google, Microsoft or email/password; email magic links and password reset are available. An email code may be requested for a new device. Active device limits are Free 1, Professional 2, Enterprise 3; manage sessions and trusted devices in Security. Project owners can invite Viewers or Editors; viewers read/load, editors can save changes, and owners manage sharing and deletion. Editor sharing requires paid access. An invitation to an existing account appears at the top of the Projects menu with Accept and Decline. Import survey surfaces/drawings through Project Layers: .12da, .12daz, .dxf, .kml, .kmz, LandXML (.xml), .zip (shapefile), and .obj and .ply surfaces, up to 1 GB. Confirm the coordinate system when prompted. The import dialog marks which groups hold a surface and lists any group it skipped, with the reason. Use Elevation data to inspect local coverage, source, survey year, resolution and datum. Availability varies by location; Australia and New Zealand have different sources and coverage. Uploaded TIN surfaces can supply survey ground. Reports and map/chart figures carry credits; map exports can be refused when imagery restrictions apply or a required capture fails. Keep the browser tab visible while capturing and read the panel's message. ## Links - [Full workflows and troubleshooting](https://road.engineering/llms-full.txt) - [Human guide page](https://road.engineering/ai) - [Data sources and licences](https://road.engineering/sources) - [Disclaimers](https://road.engineering/disclaimers) - [Terms](https://road.engineering/terms) - [Privacy](https://road.engineering/privacy) - [Refunds](https://road.engineering/refunds) - [Support](https://road.engineering/support) - [Product changes](https://road.engineering/changelog)