This weighs 50kg and will not be legally considered a bicycle. So you will need a license plate and insurance. And then it's probably not street legal. So you can drive this in the woods, if you don't get caught.
What EU legislation says about the max. bike weight?
2002/24/EC does however say:
* the maximum continuous rated power may not be more than 250W
* assistance may be provided only while pedaling
* assistance may not be provided beyond 25 km/h