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A Deutsche Post AG logo sits on the steering wheel of a StreetScooter emission-free electric light commercial vehicle (LCV) in Hamburg, Germany, on Tuesday, March 7, 2017. With car makers including Volkswagen AG and Daimler AG unable, or unwilling, to develop a van for Deutsche Post AG that was meant to offer little beyond the ability to carry a maximum of parcels at zero emissions, Europe's largest postal service partnered with a university professor to develop the vehicle itself. Photographer: Krisztian Bocsi/Bloomberg via Getty Images

A Deutsche Post AG logo sits on the steering wheel of a StreetScooter emission-free electric light commercial vehicle (LCV) in Hamburg, Germany, on Tuesday, March 7, 2017. With car makers including Volkswagen AG and Daimler AG unable, or unwilling, to develop a van for Deutsche Post AG that was meant to offer little beyond the ability to carry a maximum of parcels at zero emissions, Europe's largest postal service partnered with a university professor to develop the vehicle itself. Photographer: Krisztian Bocsi/Bloomberg via Getty Images

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Letters sit in a tray ahead of distribution inside a Deutsche Post AG delivery station in Hamburg, Germany, on Tuesday, March 7, 2017. With car makers including Volkswagen AG and Daimler AG unable, or unwilling, to develop a van for Deutsche Post AG that was meant to offer little beyond the ability to carry a maximum of parcels at zero emissions, Europe's largest postal service partnered with a university professor to develop the vehicle itself. Photographer: Krisztian Bocsi/Bloomberg via Getty Images

Letters sit in a tray ahead of distribution inside a Deutsche Post AG delivery station in Hamburg, Germany, on Tuesday, March 7, 2017. With car makers including Volkswagen AG and Daimler AG unable, or unwilling, to develop a van for Deutsche Post AG that was meant to offer little beyond the ability to carry a maximum of parcels at zero emissions, Europe's largest postal service partnered with a university professor to develop the vehicle itself. Photographer: Krisztian Bocsi/Bloomberg via Getty Images

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Loading bays, distribution hub of parcel service Deutsche Post a

Loading bays, distribution hub of parcel service Deutsche Post a

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The Deutsche Post AG logo sits on a sign outside a mail sorting office in Frankfurt, Germany, on Tuesday, Aug. 4, 2015. Deutsche Post deepened a management overhaul at its global forwarding unit as part of a turnaround effort that included the departure of the division head in April. Photographer: Martin Leissl/Bloomberg via Getty Images

The Deutsche Post AG logo sits on a sign outside a mail sorting office in Frankfurt, Germany, on Tuesday, Aug. 4, 2015. Deutsche Post deepened a management overhaul at its global forwarding unit as part of a turnaround effort that included the departure of the division head in April. Photographer: Martin Leissl/Bloomberg via Getty Images

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A postal worker loads parcels into a StreetScooter emission-free electric light commercial vehicle (LCV) ahead of distribution at a Deutsche Post AG delivery station in Hamburg, Germany, on Tuesday, March 7, 2017. With car makers including Volkswagen AG and Daimler AG unable, or unwilling, to develop a van for Deutsche Post AG that was meant to offer little beyond the ability to carry a maximum of parcels at zero emissions, Europe's largest postal service partnered with a university professor to develop the vehicle itself. Photographer: Krisztian Bocsi/Bloomberg via Getty Images

A postal worker loads parcels into a StreetScooter emission-free electric light commercial vehicle (LCV) ahead of distribution at a Deutsche Post AG delivery station in Hamburg, Germany, on Tuesday, March 7, 2017. With car makers including Volkswagen AG and Daimler AG unable, or unwilling, to develop a van for Deutsche Post AG that was meant to offer little beyond the ability to carry a maximum of parcels at zero emissions, Europe's largest postal service partnered with a university professor to develop the vehicle itself. Photographer: Krisztian Bocsi/Bloomberg via Getty Images