Induced Demand: Road Expansion's Paradoxical Effect on Congestion and Urban Sprawl
Original framing: “Can building more roads make traffic worse? Here’s the mathematics behind it” — The Conversation - Global
The 'mathematics' behind induced demand is rooted in traffic flow theory and economic principles, specifically the concept of elasticity of demand. Studies in transportation engineering and urban economics provide empirical evidence and modeling to demonstrate how increased road capacity can stimulate travel demand, leading to a return of congestion.
The seemingly paradoxical outcome of more roads leading to worse traffic is a manifestation of induced demand, a systemic issue rooted in the economic principle that increased supply can stimulate demand.
This phenomenon, historically observed since the mid-20th century's car-centric urban planning, perpetuates car dependency and urban sprawl, disproportionately impacting marginalized communities and the environment. Addressing this requires a paradigm shift from infrastructure expansion to integrated mobility solutions, including congestion pricing, robust public transit, and active transportation, as demonstrated by cities globally that prioritize sustainable urban development over endless road building.