On the cost of bridges, if we take into account the time of construction, the wooden bridges are way less costly. If you look at the example of Nordic and the Stornoway Diamond Corporation mine, they constructed 17 bridges in three months. Once the cement pads on both sides of the river are dried, the bridge is built in one week. If you take into account those types of parameters, they are cheaper. Their life is longer also.
On November 22nd, 2017. See this statement in context.