An overpass is a bridge carrying one road over another roadway, railway, or obstacle, allowing traffic to flow on both levels without intersection. Overpasses eliminate traffic signal delays and conflict points where roads would otherwise cross at grade. Municipal and provincial transportation departments design and maintain overpasses based on traffic needs, costs, and site conditions. Overpass construction is expensive, typically justified at high-traffic intersections or railway crossings where delays and safety concerns warrant grade separation. Overpasses affect neighbourhoods through noise, visual impact, and changes to local access patterns. Maintenance includes structural inspections, deck repairs, and winter ice management.