The images give data about two bridges in two different urban areas of Canada. Overall, the Bridge B was constructed more recently, with a bigger cost, and stretching a longer distance, compared to the Bridge A. Additionally, the former bridge is wider than the latter one, thus its capacity is bigger.
Focusing first on the layout of Bridge A, it connects two coastal areas of its city through a network above the sea. It was built from 1975 to 1980, with $210 million expenditure. There are two concrete piers are holding the bridge from the bottom, and there is a steel truss all over the lanes. It is 40 metres in depth, stretches 1.8 kilometres of road, and has 2 lanes in total, with one lane per side.
Regarding the Bridge B, $2.4 billion was spent to erect the bridge that connects two parts of its area with each other. The construction works lasted for five years, similarly to the Bridge A (2011-2016). Piers of this bridge are similar to those of Bridge A, but thinner, and are placed not only at the bottom, but at the top as well, serving as holders for steel cables. The coastal sides’ foundations are made of rock, and the bridge itself is 60 metres deep. It covers 2.9 kilometres of road, 4 lanes in total, with 2 lanes per each side.