Why has traffic congestion increased in Sydney?

Traffic congestion in Sydney has increased due to several interconnected factors related to urban development and infrastructure:

• Public Transport Limitations: Investment in public transportation has failed to keep pace with the city's growth, leading to inefficiencies and unreliability. Consequently, there has been a significant increase in the use of private automobiles since World War II.21
• Geographic Constraints: Sydney’s layout complicates traffic flow. A large portion of the workforce commutes from outer suburbs to the central business district, forcing them through a limited number of routes. The city's geography, including its harbor, makes it difficult for north-south traffic to bypass the city centre, and the narrowness of many streets further aggravates congestion.1
• Suburban Sprawl: The city has experienced extensive suburban sprawl, which has created challenges for transport authorities. Many residents in vast outer suburbs rely on limited infrastructure to reach employment hubs.23
• Infrastructure Challenges: While express highways have been built, they have only been partially successful in relieving congestion. Additionally, the city's rapid growth has mirrored the challenges faced by other major global cities regarding traffic management.14