Happy that research time is being put towards this, however a fuel use decrease of ~0.75% is a bit underwhelming for this particular endeavor, even when consumer cars/vans are 10% of CO2 emissions.
I doubt there would be any improvement. What we have seen is traffic is a constant. If you make make the road network higher capacity or faster, people just move further out or drive to further away stores.
People have an amount of time they will tolerate driving for, and adjust everything else around that.
I think it's a mistake to represent average speed increase instead of characterizing the speed increase as as hours of full, moderate, and low speed traffic per day.
Because an extra ??minutes a day of avoiding stop and go traffic is worth far more than the average speed increase it tells.
People have an amount of time they will tolerate driving for, and adjust everything else around that.