Originally Posted by
Dahon.Steve
What he left out was the impact that trucks have in slowing down traffic. My express bus that takes me into Manhattan uses the turnpike and I see all the slow moving trucks going in the opposite direction holding up traffic as they climb the ramp at 10 miles per hour! You bet that slows down traffic and if you put thousands of them on the road, you'll never be able to fix rush hour traffic.
He states in his book that variations in speed among drivers of vehicles is not a significant source of crashes or congestion as is popularly believed. You should read the book.