Postal Bike

I frequently see these postal bikes* around Copenhagen. It makes a lot of sense for delivering mail in an urban area because you don't need to find parking and the bike can carry a lot more than a walking mail carrier. 

The postal bikes have some kind of motorized assist (I think they're e-bikes), which means they can make better time than a regular bicycle with 

*Technically they aren't bicycles because they have three wheels.