Benjamin Preston:

A few years ago, Naveen Rabelli, 33, an electrical engineer from Bangalore, India, had an idea while sitting in traffic surrounded by the ubiquitous and polluting three-wheel vehicles known colloquially as tuk tuks. Why not, he recalls thinking, make one that runs on solar-electric power?
 Then he had the idea to take a road trip with this creation, driving the tuk tuk from India to London, hoping his project will show people how a small team without many resources can undertake a long journey using clean energy.