You may see these bicycles buzzing around and going uphill without pedaling. I personally think that it's a great way to get up the hills without huffing and puffing. However, do you need a licence to ride a motorized bicycle?
If the bike goes over a certain speed they should be required. Sme goes for non-motor bicycles too and as a matter of fact, some motorised wheelchairs need to be slowed down a little too, considering they are used on footpaths and in supermarkets etc.