Batteries
Any roundabout is going to be slippery, worse still in the wet after a long dry spell....which we've forgotten exist !
We need a batterie development evolution - somewhere to store unused electric power - then you can charge your car at home and with photo-electric panels, charge those said batteries on the move - a small gpl engine might be needed to cut in on steep or long inclines or when under a heavy load - it could cut in when power requested goes above the normal discharge !
But one needs to keep the power somewhere efficient and above all light !
We appear to be light years away from us taking our electric car abroad on holiday with the caravan behind ! Stop sending Chinese take-aways into space and fix the bl**dy batterie problem !
Ok. lets fix the bloody battery problem.
1: We have an energy supply problem in most countries, so where do you propose to obtain all the extra energy required to build all those expensive to make and highly toxic batteries?
Then where are you going to get all that energy required to charge them? Build more power stations - but what kind?
There are a variety of other solutions out there, but there is, around the world a distinct lack of the political will required to make the very, very hard decisions that would go some way to achieving them.
You can see why, there are vested interests in politics and business (the car industry in particular, the petroleum industry and of course the battery makers), mucho money and millions of jobs, not just in the above mentioned industries but all the attached service and aftermarket industries.
Batteries may be an achievable stop-gap technology but long term you have very serious issues to overcome and not least the disposal of all those used highly toxic batteries.
Take a look at the Toyota Prius (preferably with eyes closed - ugly just understates it), as Top Gear showed not so long ago, it is actually very very inefficient in the long term, ecologicaly speaking, it's carbon footprint is truly awful. A very clumsy attempt at acquiring "green" credentials.
Nope, battery problem not fixed. In fact maybe all it does is make the situation worse?
Now storing unused/surplus energy for later distribution. Mmmm now there's a very interesting idea, it'd have to be on a huge scale to be energy efficient. Now what did you have in mind for that Sean, you got me very interested in that one. C'mon cough it up.