The precise mix is still to be determined from long-run cost estimates and environmental considerations. Efficient, safe and reliable public transport is an imperative for the green economy, since it is more energy efficient than mass transit via private motor car. The challenge for the authorities is to establish special lanes for buses, to encourage car-pooling, to designate urban areas for bicycles and pedestrian traffic, and to restore the railway for urban-rural movement of people and goods. There are around 30,000 hotel and villa rooms and many attractions, generally located on the coast. Tourism was the first sector that adopted greening as a strategy, ultimately for marketing.