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Originally Posted by BPHannes
The difference to existing hybrids would be that the electric motor only has to move the car very slowly, so energy demands are lower.
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The existing hybrids also have limited speed on pure electric power - 50 kph in the Prius.
16 kph seems a very low speed - even for these kind of zones.
30kph (19 mph) seems more reasonable, and will be a far more common speed limit anyway.
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The electric motor could also give additional boost to the ICE, but the goal is to have a traditional ICE car (no matter of what size) that has an EV mode to enter zero-emission zones.
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Combining both IC and electric engines for simultaneous operation is a serious challenge.
It's far easier to shut one down, and start the other one on the go.
Most cars here in Europe are front wheel drive, so they have 2 wheels just sitting there that could relatively easily be converted to electric drive wheels.
i.e. something like a more sensible version of the Volvo V60 hybrid
(Diesel front drive, electric rear drive)