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The Urban Two, #608, UrbanConcept, running on Hydrogen, competing for team ENSEM Eco Marathon, from Ensem Vandoeuvre-Les-Nancy, Vandoeuvre-Les-Nancy, France, The Cimbrer, #611, Vandoeuvre-Les-Nancy, competing for Team Aalborg Energy, Aalborg University, Aalborg, Denmark, The XAM, #515, UrbanConcept, running on Gasoline, competing for Team H2polit0 - Molecules going hybrid, from Politecnico Di Torino, Torino, Italy and The DTY Dynamo, #501, UrbanConcept, running on Ethanol, competing for team DTU Roadrunners, from Technical University Of Denmark, Kings Lyngby, Denmark on the track during day 4 of the Shell Eco-marathon Europe 2014, Sunday, May 18, 2014, at the Ahoy Center in Rotterdam, Netherlands. (Jiri Buller/AP Images for Shell)