Prompt
Problem + solution – Traffic congestion
In many cities, traffic congestion is becoming worse. What are the main causes of this problem and what solutions can you suggest?
Band 9 sample answer
Band 9 sample answer
Sentence-by-sentence analysis
Anatomy of a Band 9 Essay
Read the model answer normally, or switch on the examiner breakdown to see how each sentence contributes to the response.
Analysed against the four IELTS Writing assessment criteria. Each note explains how this specific sentence supports the essay.
Paragraph 1: Introduction — identifies the main causes and establishes the solution strategy
Traffic congestion is intensifying in many cities, wasting commuters’ time, worsening air quality and undermining productivity. The problem is largely driven by car-dependent urban growth and policies that make driving artificially convenient. The most effective solutions therefore combine high-quality public transport with pricing and regulatory measures that reduce unnecessary car trips.
The participial sequence efficiently establishes three consequences of congestion while keeping the sentence focused on the problem introduced by the question.
The essay answers the causes question immediately by identifying two controlling causes: the physical design of cities and incentives that favour private cars.
The introduction also answers the solutions question, previewing a matched response: improve alternatives to driving while simultaneously reducing incentives to use cars unnecessarily.
Paragraph 2: Body 1 — explains the structural and policy causes of congestion
One key cause is rapid suburban expansion without parallel investment in mass transit. As housing spreads further from employment centres, daily travel distances increase and many residents have little choice but to drive, particularly where buses are infrequent, overcrowded or perceived as unsafe. Congestion is also fuelled by weak management of road space. When parking is plentiful and cheap, and traffic laws are inconsistently enforced, drivers are encouraged to make short, discretionary journeys by car. Poorly synchronised traffic lights, illegal stopping and the mixing of freight with peak-hour commuter traffic can further choke main corridors.
The first cause is clearly defined as a mismatch between outward urban growth and transport infrastructure, giving the paragraph a specific structural focus.
The subordinate opening establishes a clear causal sequence from dispersed housing to longer journeys and car dependence, while the final clause explains why public transport may not be a realistic substitute.
“Also” signals the move from urban form to a second cause, allowing the paragraph to broaden without losing its focus on why excessive traffic develops.
This sentence explains how policy changes behaviour: cheap parking and weak enforcement lower the practical cost of choosing a car even for journeys that need not be driven.
Precise transport vocabulary such as “synchronised traffic lights”, “illegal stopping” and “peak-hour commuter traffic” identifies operational sources of delay without resorting to technical jargon.
Paragraph 3: Body 2 — gives solutions that directly match the identified causes
To tackle these causes, cities must first make public transport a genuinely attractive alternative. Expanding metro lines and bus rapid transit, improving reliability through dedicated lanes, and integrating ticketing across modes can shift large numbers of people away from private vehicles. At the same time, demand should be managed by charging for scarce road space: congestion pricing in central areas, higher curbside parking fees and limits on long-stay parking discourage solo driving at rush hour. Finally, smarter operations can unlock capacity without new roads, for example by coordinating signals, enforcing bus lanes, and scheduling deliveries in off-peak windows.
The solution paragraph explicitly links back to “these causes”, and its first priority directly addresses the earlier problem of residents having little practical alternative to driving.
Three concrete transport improvements explain what “attractive alternative” means in practice: greater coverage, better reliability and easier transfers between services.
This solution directly answers the earlier incentive problem. Rather than merely expanding roads, it raises the cost of using scarce road space when congestion is most severe.
“Unlock capacity without new roads” concisely captures the operational solution, while the examples correspond closely to the signal, enforcement and freight problems identified in Body 1.
Paragraph 4: Conclusion — synthesises causes and matched solutions
In sum, congestion stems from both urban form and poor incentives. Upgrading transit while pricing and managing car use is the most sustainable way to keep cities moving.
The conclusion compresses the cause analysis into its two governing categories, showing clear control over the argument rather than repeating every supporting detail.
The final sentence mirrors the essay’s two-part solution logic: improve alternatives and manage demand simultaneously, providing a concise synthesis of the response.
Verified word count: 277
Analysis by IELTS Master editorial review. How this analysis is created and reviewed
Useful vocabulary and phrases
car-dependent urban growth
Diagnoses a structural cause rather than a superficial symptom.
Car-dependent urban growth makes driving the default option for many commuters.
underpriced road space
Adds an economics-based explanation that sounds analytical.
When road space is underpriced, drivers have little incentive to change behaviour.
bus rapid transit (BRT)
Makes solutions specific and credible.
BRT corridors can provide metro-like capacity at a lower cost.
integrated ticketing
Shows practical implementation detail.
Integrated ticketing reduces friction when transferring between bus and rail.
congestion pricing
Directly targets demand where congestion is worst.
Congestion pricing can cut peak-hour traffic by discouraging non-essential trips.
coordinate traffic signals
Offers a cost-effective, non-infrastructure solution.
Coordinating traffic signals can reduce stop-start conditions on main routes.
Common mistakes to avoid
- Explaining only one cause (e.g., population) and ignoring policy and planning factors.
- Listing many solutions without showing how each reduces congestion.
- Proposing unrealistic measures (e.g., banning all cars) without feasibility or safeguards.
- Using vague language such as “improve transport” without specifying reliability, frequency, or network integration.
Now apply what you have learned
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