Composite is resistant to salt and frost, and can be very advantageous compared to concrete and steel. The weight is of the essence. A composite bridge has a weight that is 40% lower than steel, and 30% lower than concrete.
The environmental benefits are also optimal. In a study, in which the accumulated energy level and C02 footprint of different types of bridges are compared, the results show that composite materials have greater environmental benefits compared to steel and concrete: