The TND Design Rating Standards do not include pedestrian paths in the intersection density calculation. That’s because a principle of traditional neighborhood design is that all streets are pedestrian friendly and most pedestrian travel will happen on street sidewalks, not on segregated paths or dead ends. Areas that are not vehicular lanes must be larger than 1 acre (0.4 hectare) to count as a block; otherwise elements like traffic islands and roundabouts are considered part of a single intersection.

The LEED systems do include pedestrian paths when calculating intersection density. That raises the possibility of tiny “blocks” that increase the intersection density in an unjustifiable way. The spaces between paths on a college quadrangle are an example. I once suggested that LEED use a 1-acre (0.4 hectare) minimum when calculating intersection density. I don’t know what if any methods LEED now uses to address that issue.

]]>I do have another question:

As for pedestrian network, I computed the intersection density:for that I considered the same intersections for motorized network (as sidewalks) and added the intersections for alleys and shortcuts, of course for that case the pedestrians network will seem to have a better intersection density, I read somewhere that there is a correction coefficient for intersections for pedestrians network, do you have any ideas about that?

Also what is considered a mimimum and a good intersection density per km2?

Thank you ]]>

That being said, there’s nothing artificial about the chart and I stand by my assertion that it’s an accurate reflection of our national systemic fatal-crash risk on an annual basis.

]]>Using the annual VMT per roadway class data from the Functional System Travel table (https://www.fhwa.dot.gov/policyinformation/statistics/2013/vm2.cfm), you used average speed on each of those classes of roadway to determine how much time is needed to travel each distance. Then, you used quantity of fatalities per roadway type data (where did that come from? I don’t see it on FARS – though I’m still getting comfortable with the query tool) to determine fatalities-per-vehicle-hour by roadway class. ]]>

Unfortunately, the excitement of driving derives from its more dangerous elements.

You have displayed the cost of high speed mobility.

Thanks ]]>