In late 2014, SolaRoad, reportedly the first solar roadway, was opened in Amsterdam, along 70m of a cycle path between two suburbs of the Dutch capital. SolaRoad consists of a cycle path constructed of concrete modules measuring 2.5m x 3.5m. In one lane, solar cells are fitted underneath a tempered glass top layer of around 1cm thickness, covered by a rough, transparent coating. The solar electricity from the road is fed into the electricity grid.