Read the passage below carefully and answer the question that follows.
Historically, municipal authorities across West African metropolitan centers viewed informal mini-bus transit networks—such as Lagos's danfos or Accra's tro-tros—as urban detriments responsible for traffic congestion, air pollution, and fiscal leakage. Consequently, early urban planning paradigms prioritized aggressive fleet modernization programs and state-run bus rapid transit (BRT) monopolies aimed at systematically replacing these informal operators. However, these top-down interventions repeatedly failed due to high capital costs, rigid routes, and an inability to match the hyper-flexible coverage that informal drivers provided to sprawling peri-urban settlements. In recent years, urban transport theorists have shifted toward a hybrid integration framework. Rather than eradicating informal operators, contemporary strategies leverage digital mapping technologies and mobile payment infrastructure to formalize route structures and standardize fares without sacrificing operational elasticity. Ultimately, this paradigm shift demonstrates that sustainable public transit in rapidly growing African megacities depends not on displacing informal operators, but on synthesizing their organic adaptability with structured municipal oversight.
Arrange the key summary points below in the logical sequence that reflects the author's progression of central arguments from problem background to the final thesis.
- 1Municipal authorities initially categorized informal mini-bus networks as disruptive hazards to urban infrastructure and revenue.
- 2State-managed transit monopolies failed to replace informal operators due to excessive costs and structural inflexibility.
- 3Modern transport frameworks employ digital tools to standardize and integrate informal transit routes into public planning.
- 4Sustainable megacity transit depends on synthesizing the organic flexibility of informal operators with formal municipal regulation.