Scientists have identified a number of factors that make deliveries by drone considerably less energy efficient than those made by vans.
Firms such as Amazon are hopeful that once regulatory hurdles are cleared, they will eventually be able to deliver items by drone, which could allow for exceptionally short delivery times and could help to ease congestion on the roads. 
However, a team from the Martin Luther University of Halle-Wittenberg (MLU) in Germany has found …


source: E&T News, tags: drones keywords: urban traffic management,drones,energy,transport comment: