Pretty much anything that requires vehicles to use their brakes funds terrorism because every stop requires subsequent acceleration. Sure, the net effect from adding one stop sign is negligible, but it's tragedy of the commons. If everybody does it then it adds up.

And it's not just wasted fuel, it's wear on the vehicles (which harms used car reliability and negatively impacts the poor), stress on the vehicle occupants, time wasted, delayed emergency response time, etc. Multiply by a hundred million stop signs and turns into something worth optimizing.

As automation comes about detroit and the EPA will lean on the people who write laws to do things like make 4 way stops into 2 way stops, make it legal to rolling stop at a right turn, get rid of red arrows at dedicated left turn lanes that don't cross 3 lanes of traffic, etc etc in order to save fuel.

There will be a lot more flashing yellows in a few years.

So every single gallon of gasoline used in every country is all provided by conflict petroleum?

By the same token, every plastic spork is funding terrorism.

> So every single gallon of gasoline used in every country is all provided by conflict petroleum?

Of course it is. Petroleum is a global commodity. If there is more demand anywhere then the price goes up and all sellers make more money.

> By the same token, every plastic spork is funding terrorism.

Only the ones that aren't recycled. Make sure you recycle your spork.

Except there's currently a price war going on because of fracking. There's way more supply than there was a decade ago, most of it domestic.

Which has no effect on the principle. Increasing the demand will increase the price regardless of whether the existing price is $2 or $4.