I'm going to tell you something that surprises most of my students: you can write a solid IELTS essay on traffic and city planning using just 30-40 targeted vocabulary items. Not 500. Not 200. Thirty to forty words, used accurately and varied throughout your response. The difference between a Band 6 and a Band 7 in Lexical Resource isn't how many obscure words you know. It's whether you use the right words in the right places without sounding like you swallowed a thesaurus.
I've sat through hundreds of essays where students threw in "infrastructure amelioration" and "vehicular congestion mitigation" when they meant "better roads" and "less traffic." The examiner notices. Your score reflects it. Here's what actually works.
Transport shows up on roughly 15-20% of IELTS Writing Task 2 papers. That's common enough that you need to be ready. More importantly, the vocabulary overlaps with environmental issues, technology, and social policy questions, so mastering this set gives you tools for five other topics.
The IELTS examiners love transport and urban planning questions because they're open-ended. You can argue for public transport investment, against car-dependent cities, or for mixed solutions. You can discuss cost, environmental impact, safety, or convenience. This flexibility matters because you can pick an angle you actually understand and use vocabulary that fits your argument naturally instead of forcing in words you half-know.
Looking at recent Cambridge IELTS papers, you'll see prompts like: "Some people think that public transport should be free for all users. To what extent do you agree or disagree?" and "Urban planners should focus on developing public transportation systems rather than road networks for private vehicles. Discuss both sides and give your opinion." Different angles, same vocabulary pool. Once you nail the vocabulary for one angle, you can adapt it instantly.
Let me give you the non-negotiables. These 15 words appear in Band 7+ essays consistently because they're precise enough to show competence but common enough to use naturally. You'll deploy most of these multiple times in a single response.
These 15 words form the backbone. You'll use them 3-5 times in a 250-word response. That's healthy repetition, not lazy writing, because they're the precise tools for this topic.
Here's where most students make a mistake. They know the core 15, so they try to sound fancy by adding random sophisticated words. But Band 7 doesn't mean "fancy." It means "precise in context." These 12 words show precision.
Notice these aren't random difficult words. Each one solves a specific communication problem. You use "modal shift" because you need to describe people changing transport types, and "congestion pricing" because you're discussing that specific policy. That's Band 7 thinking.
This is where most students mess up. They memorize a word, use it once, and never again. Or they use it incorrectly because they only half-understand it. Here's what I see constantly.
Weak: "Many people commute in the city. The commutation is difficult because of infrastructure problems. People need better commutation options."
This uses the same word three times in different forms and sounds repetitive and strained. "Commutation" isn't even standard here.
Good: "Most urban commuters rely on private vehicles because public transport infrastructure remains inadequate. Improving accessibility and affordability would encourage a modal shift toward buses and trains."
"Commuters" used once, then the sentence moves forward. "Private vehicles" and "public transport infrastructure" build on each other. "Modal shift" appears once, precisely, where it belongs. That's how Band 7 uses vocabulary.
Here's another pair:
Weak: "Transport emissions are very bad for the environment. We must reduce transport emissions by using sustainable transport like cycling or sustainable public transport systems."
You're repeating "emissions," "transport," and "sustainable" too many times. The examiner reads this and checks a box: lacks lexical range.
Good: "Transport is a major source of carbon emissions, making cycling and public transit essential for reducing urban pollution. Sustainable systems not only decrease pollutants but also improve accessibility for residents who cannot afford private vehicles."
Same information. Notice "emissions" appears once, then you shift to "pollutants" and "pollution." "Sustainable" appears once. "Public transit" and "private vehicles" are used as needed, not obsessively repeated. This is natural vocabulary use.
Knowing words isn't enough. You need to know how they combine. IELTS examiners check your Lexical Resource partly by looking at collocations: whether you use words in the combinations that native speakers actually use. Get this wrong and you drop 0.5 bands instantly.
These kill your score:
Use these instead:
I want to be blunt. Getting collocations right pushes you from Band 6.5 to Band 7 faster than almost anything else. An examiner reads "reduce congestion" and thinks "this student knows the language." They read "solve the traffic" and make a note: Lexical Resource 6.0. That's how language proficiency works.
These specific errors cost my students 0.5 bands on Lexical Resource. Avoid them.
Mistake 1: Using "transport" as a verb when you mean "travel."
Wrong: "People transport themselves by car every day."
Right: "People travel by car every day" or "People commute by car daily."
Mistake 2: Overusing "sustainable."
Wrong: "We need sustainable cars and sustainable buses and sustainable cities and sustainable growth."
You sound robotic. Pick your moments. Use "sustainable transport systems" or "sustainable urban development." That's enough. Don't force it five times in one paragraph.
Mistake 3: Confusing "affect" and "effect."
Wrong: "Congestion will effect the city's economy." (Wrong verb form.)
Right: "Congestion negatively affects residents" or "Congestion has negative effects on residents."
Mistake 4: Overusing "infrastructure."
Infrastructure is a good word. Use it once, maybe twice in a 250-word essay. Don't write "Infrastructure includes roads and infrastructure like buses and other infrastructure." Vary your sentences instead: "Poor roads limit access. Bus networks remain underfunded. Pedestrian pathways are unsafe." That's more interesting and shows vocabulary range.
Don't just read this post and hope it sticks. You need a system that actually works.
Step 1: Pick three words from the advanced section.
Let's say "modal shift," "congestion pricing," and "urban sprawl." Write one sentence using each correctly. Don't move forward until each sentence is grammatically sound and uses the word in a real collocation, not something you invented.
Step 2: Write a mini-paragraph using these three words plus three words from the Core 15.
Example: "Urban sprawl in developing countries increases car dependency and strains inadequate infrastructure. Congestion pricing has worked in London and Singapore, though affordability remains a concern for low-income commuters. A viable solution would integrate public transport investment with initiatives to encourage cycling in inner-city areas."
Step 3: Practice with real IELTS essay