As part of it's Nissan Green Program 2010, the Japanese company is adding compressed natural gas and diesel hybrid variants to it's Japanese-market commercial delivery trucks. The CNG version is a pretty straightforward example, running on natural gas and getting low emission vehicle certification. It also gets an automatic start/stop to eliminate idle emissions. The diesel hybrid is a little more complex. It uses two separate drive mechanisms for the diesel and electric motor with a power take off. This allows the vehicle to continue running even if the electric drive has a problem.
[Source: Nissan]

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