Highway Sim is a road-building simulation played like a county engineer. Design alignments over living terrain and set the cross-section, from lanes and shoulders to barriers and lighting, against real AASHTO checks. Bid the job out, award a contractor, and watch live crews build it on the clock: excavators and pavers, weather days, RFIs and change orders that test your judgment. Open the road and the world answers. Traffic finds its routes, towns grow, tolls earn, pavement wears, and storms flood the sag you forgot to drain. Expect bridges and tunnels, storm drainage, a live economy, and every corner you cut coming back later as a number.