Transport & CitiesProblem–Solution
IELTS Essay: Traffic Congestion — Causes and Solutions (Band 9 vs 6.5)
In short
Below is a full Band 9 model answer to this IELTS Writing Task 2 question, the same question written at Band 6.5, and a criterion-by-criterion breakdown of exactly what separates them — so you can see what to change in your own writing. Then check your essay with the free tool.
The question
Many cities around the world suffer from serious traffic congestion. What are the main causes of this problem, and what measures could be taken to solve it?
How to approach a Problem–Solution question
A problem/solution question needs realistic causes or problems in one body paragraph and directly matching solutions in the other. Keep the two linked — each solution should address a problem you actually raised — and be specific: vague answers like 'the government should do more' score poorly compared with concrete, plausible measures.
The plan
- 01Introduction — paraphrase the problem and signal causes then solutions
- 02Body 1 — causes: car dependence, rapid urbanisation, weak public transport
- 03Body 2 — solutions that match the causes: invest in public transport, congestion charging, planning
- 04Conclusion — restate causes and the measures that address them
Band 9 model answer
Traffic congestion has become one of the defining frustrations of modern urban life, costing economies billions in lost time and worsening air quality. This essay will examine the principal causes of the problem before proposing measures that address them directly.
The root cause is straightforward: too many private vehicles competing for limited road space. Rapid urbanisation has drawn ever more people into cities, while rising incomes have made car ownership both aspirational and affordable. Where public transport is unreliable or sparse, driving becomes less a choice than a necessity, and the result is roads designed for a fraction of the traffic they now carry.
Effective solutions must therefore reduce dependence on private cars rather than simply build more roads, which tends to attract yet more traffic. The most powerful measure is sustained investment in fast, affordable public transport — metro and bus networks that genuinely compete with the car. This can be reinforced by congestion charging, as London and Singapore have demonstrated, which prices private driving in city centres and funds the alternatives. In the longer term, urban planning that places housing, work, and services closer together reduces the need to travel at all.
In conclusion, traffic congestion stems chiefly from an over-reliance on private cars amid rapid urban growth. By investing heavily in public transport, pricing car use sensibly, and planning cities to shorten journeys, governments can tackle the causes of the problem rather than merely its symptoms.
The same question at Band 6.5
Nowadays, traffic congestion is a big problem in many cities around the world. In this essay, I will discuss the main causes of this problem and also suggest some solutions to solve it.
There are several causes of traffic congestion. The main cause is that there are too many cars on the road. These days, many people can buy a car because they have more money, so the number of cars is increasing every year. Another cause is that the public transport is not good in some cities, so people prefer to use their own car instead of the bus or the train.
There are some solutions to solve this problem. Firstly, the government should improve public transport so that people can use it instead of cars. For example, they can build more trains and buses. Secondly, the government can make people pay money to drive in the city centre, which will reduce the number of cars. Also, people can share cars with their friends to reduce the traffic.
In conclusion, the main causes of traffic congestion are too many cars and bad public transport. To solve this problem, the government should improve public transport and reduce the number of cars in the city. If they do these things, the traffic problem will get better.
What separates them, criterion by criterion
| Criterion | Band 9 | Band 6.5 |
|---|---|---|
| Task Response | Identifies a clear root cause and offers solutions that directly address it (reducing car dependence), so causes and solutions are tightly linked and fully developed. | Names sensible causes and solutions, but they are general and the link between them is loose; ideas are stated rather than explained. |
| Coherence & Cohesion | Logical progression with sophisticated linking ('therefore', 'This can be reinforced by', 'In the longer term'); each solution echoes a cause. | Clear paragraphs but basic sequencing ('Firstly', 'Secondly', 'Also'); solutions are listed rather than tied back to causes. |
| Lexical Resource | Strong topic collocation ('car dependence', 'urbanisation', 'congestion charging', 'symptoms rather than causes'). | Everyday, repetitive vocabulary ('big problem', 'not good', 'reduce the traffic'); limited precision. |
| Grammatical Range & Accuracy | A confident range of complex sentences, highly accurate. | Mainly simple and compound sentences; accurate but limited, with little variety. |
Examiner's note
The Band 6.5 answer is well-organised and on-topic — it would satisfy many requirements — but its causes and solutions sit side by side without being connected, and the language is plain and repetitive. The Band 9 links each solution back to a cause, develops every point, and uses precise topic vocabulary. Tighter cause-solution linking and stronger collocation are the two upgrades that matter most here.
Vocabulary from the Band 9 answer
| Word / phrase | Meaning |
|---|---|
| car dependence | over-reliance on private cars for transport |
| urbanisation | the growth of cities as people move to them |
| congestion charging | a fee for driving into busy city areas |
| aspirational | seen as desirable and a sign of success |
| unreliable | cannot be depended on |
| to attract traffic | to cause more vehicles to use a road |
| sustained investment | continued spending over a long period |
| road space | the capacity of roads to carry vehicles |
| symptoms rather than causes | the surface effects instead of the underlying reasons |
Frequently asked questions
How do I structure a problem-solution (causes and solutions) IELTS essay?
Use one body paragraph for the causes and one for the solutions. Keep the two linked — each solution should address a cause you actually raised — and be specific. A four-paragraph structure (introduction, causes, solutions, conclusion) works reliably for this type.
Do my solutions need to match my causes?
Yes, ideally. The strongest essays present solutions that directly tackle the causes they identified, which shows a coherent line of reasoning. Offering solutions unrelated to the causes you raised weakens Task Response and makes the essay feel disjointed.
How many causes and solutions should I include?
Two or three of each, developed properly, is far better than a long list of undeveloped points. Depth beats breadth: explain why each cause matters and how each solution would work, rather than simply naming them.