Lay out a new road over real 3D terrain, check it against design-speed rules, build it with a construction fleet, then open it to traffic and compare with the old road.
Design – click the map (or the terrain) to add control points, drag to move. Curves are clothoid spiral + arc sized from the design speed; the vertical profile has parabolic crest/sag curves. Drag the profile handles at the bottom.
Section – lanes, shoulders, ditches, cut/fill slopes. Earthwork, mass-haul, cost, land and environment penalties update live. Deep cuts become tunnels, river crossings become bridges.
Build – allocate the fleet and watch dozers, excavators, scrapers, trucks, graders, rollers and pavers cut and fill the hills station by station.
Traffic – IDM car-following with trucks, curve and grade speeds, LOS, crash-risk and travel time against the old road.
Drag to orbit, wheel / pinch to zoom, right-drag or two fingers to pan. 1 2 3 cameras, Space pause, Del delete point.
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