By Julio Arbesú
In 2100, fast traffic will not circulate at ground level in the cities or the fields. This will be prohibited. There will be less air traffic than nowadays. On land, there will be fast (300-500 km/h) and ultra-fast (more than 1,000 km/h) lines, all of them light and continuously elevated on columns. They will often span great distances by means of hanging bridges in order to avoid rivers and accidents on the ground. Abundant lines, hanging between floating platforms, will cross the oceans.