Using a named example, evaluate the success of a transport strategy used to reduce traffic congestion in a city.
Model answer
Curitiba in Brazil, a city of about 1.8 million people, is famous for its bus rapid transit (BRT) system, which has been largely successful in reducing traffic congestion.
The system began in the 1970s. Express buses run on their own lanes along the main routes into the city centre, so they are not held up by cars. Passengers pay before boarding at distinctive tube-shaped stations and step straight onto the bus at floor level, which makes stops very quick. Long bi-articulated buses carry over 200 passengers each, and the network is integrated, with a single fare allowing people to change between colour-coded express, feeder and inter-district routes. The city also planned high-density housing and offices along the bus corridors, so many people live close to a fast bus route.
The strategy has had many successes. The BRT carries a large share of the city's commuters, so far fewer people need to drive, which reduces congestion, fuel use and air pollution compared with what it would otherwise be. It was much cheaper to build than an underground railway, so the city could afford it, and it has been copied by many other cities around the world, such as Bogotá in Colombia - strong evidence that it works.
However, there are limitations. The buses are often overcrowded at peak times, and the system has struggled to keep up with the city's growth. Car ownership in Curitiba has still increased as people have become wealthier, so congestion has not been eliminated, and the network needs continual investment to stay attractive.
Overall, I think Curitiba's BRT has been very successful. It has kept the city's congestion much lower than it would otherwise be, at a low cost, and has become a model for cities worldwide. Its limitations show that public transport must keep improving, and may need to be combined with measures that discourage car use, if it is to stay effective as a city grows.
Explanation
An evaluation needs the details of how the strategy works, evidence of what it achieved, its limitations, and a final judgement. Strong answers judge success against the aim (reducing congestion) and consider cost and change over time. Any named strategy can be used - Curitiba's BRT, London's congestion charge or Bristol's MetroBus, for example.