Light Rail Myths and Realities 4959Yep. Wave propagation is often the phenomena you observe when the flow inexplicably slows and when you get to the source there's nothing there. There...
Robert Cote
It can. Let's buttume that a given road has an unlimited number of free lanes. Then the upper limit of the measured 85th percentile speed of traffic would consbreastute free flow conditions.
Suppose now that the number of lanes is reduced to the point where there are still enough to handle actual the actual AADT. If enough cars get side by side to temporarily occupy all available lanes so that traffic behind them cannot pbutt, then free flow conditions do not exist because traffic speed is limited by the speed of the drivers side by side (especially if the speed is lower than the peak value of the 85th percentile speed).
Of course the side by side condition isn't permanent. There will be some speed differential and gaps will eventually open up to allow cars through. Of course, it is a given that the number of faster vehicles that can make it through the gap will be smaller than it would be had there been open road ahead.
Now, buttume good lane discipline. These same vehicles that occupied all lanes are now in single file in the right most lane. Faster traffic will then have the entire road - 1 lane available to pbutt. The 85th percentile speed will not be noticably affected and the condition is still free flow.
The context was roads below capacity.
See above.
Light Rail Myths and Realities 4958How about this: Although, he buttumes KRETP in his analysis. Being from a nation of more displined driving (Japan) that is understandable. He does realize that it varies from place...
See above.
You fail to understand the concept of KRETP. Suppose traffic volume in the right lane built up sufficiently so that speed actually dropped. It stands to reason that some drivers who want to go faster will switch over to the next lane and start pbutting. In reality, people will start pbutting long before the speed in the right most lane drops. KRETP will never result in sole utilization of only one lane out of x lanes.
Which will happen later with KRETP as opposed to random distribution. If the lanes to the right are utilized more than lanes to the left, you'll have greater flow as opposed to all lanes being used evenly since faster traffic will be able to filter around slower traffic easily. Greater flow translates to more efficient use of existing capacity.