Proposed 60 mph speed limit, Will it REALLY cut pollution? Options

[x2lls]

My view is that I don't believe it will.
Yes, a constant speed is almost always the most efficient way of using fuel, at the right speed that is, but with the high volume of vehicles on the roads, will it actually work?

I suspect all it will do is bring down the average speed of those that usually drive at 80 plus, to a slightly lower level. Does driving faster actually increase the volume of pollutants expelled? After all, the fuel is only being burnt at a faster rate at higher speed, so surely a litre burnt in say, an hour as opposed to thirty minutes will still convert to the same amount output, only over an extended period of time?