From Angloinfo.com (the text below has been slightly modified to better suit the exam)

Many intercity roads in Brazil are toll roads. Drivers queue and pay at booths before proceeding along these routes.

Statistically, Brazil has some of the worst accident rates in the world. The São Paulo to Santos road along with many stretches of the coastal BR101 highway are especially dangerous routes. There are approximately 40,000 fatalities per year on Brazilian roads.

While some roads are of very high standard, particularly state roads and toll roads, others, for example some inter-city federal roads, are in poor condition with uneven surfaces, potholes and inadequate signage.

Roads ___ cities can be ___ extremely bad condition. Steep hills ___ the troughs designed ___ carry the heavy rains ___ São Paulo as well as speed humps often lead to ground clearance issues and can cause significant damage to a vehicle’s lower bodywork.

Animals or fallen trees (due to heavy rain or lightning strikes), broken-down vehicles and accidents on the road can be additional worries. Petrol/gas stations are generally not difficult to find in cities or on main connecting roads but may be much less common in remote and sparsely populated areas. Poor quality fuel can be an issue, and it is suggested that drivers purchase fuel from a reliable source.

What does “toll roads” mean in the opening line of the text?