which means of transport is expensive

From my perspective, I'd say that some forms of transportation are expensive, making them inaccessible to people with low incomes. They can't afford personal vehicles like cars or bikes. So they might choose public transportation, which can be less expensive but still a significant cost, especially if they need to travel frequently. This can limit [...]

I think helicopters and planes are expensive modes of transportation. They require a lot of money to operate and are also affected by weather conditions.