Read the text about Road Design and Materials, and choose the correct option for each question.

Designing a New Highway Intersection

The city planning team must choose the correct type of road and the best materials for the new project. They decided to build a motorway (a type of highway) that must handle very heavy traffic, which means the pavement must be thick. The project requires two hundred and fifty thousand tons of asphalt mixture for the top layer, and one hundred and twenty-five thousand cubic meters of gravel for the sub-base. They decided against a simple T-junction because the traffic flow requires a more complex design. Instead, they will build a large flyover intersection to maintain continuous flow. The width of each lane must be three point five meters. The construction team must carefully measure this width. The foreman also needs to ensure that all communications between the site office and the machine operators are clear, especially when a machine needs to compact the new layer.

What is the primary reason the city decided against a simple T-junction?