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Can you please confirm a couple of items regarding Table 89 in NCHRP Report 665. We have been waiting for the AASHTO Roadside Safety Committee to adopt Dean's recommendations for some time now. Please confirm the following:
1. We use a design speed of 75mph for freeways that are signed for 75mph - according to the text we can use the 70mph design speed in Table 89 for 70mph and higher. We will label the Design Speed column as 70mph and higher.
2. We use 65 mph design speed for urban freeway design. Interpolate between the 60-70 mph values in the table.
|Other Keywords||NCHRP Report 665|
|Date||January 20, 2011|
I conversed with Dr.
|Date||February 3, 2011|
130 Whittier Research Center
2200 Vine Street
Lincoln, NE 68583-0853
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