Goswami All in One depth exam, problem 518. The question ask for the Minimum width measured from the edge of the 8' shoulder which should be free of obstructions.
This is a 2 lane rural freeway with 12' lanes. The ADT is 16,000 and the design speed is 65 MPH. The foreslope off the shoulder to the edge of a tree is shown as a 1V:4H.
Page 3-3, Table 3-1, of the 2004 RDG shows a range of 38'-46' for the speed and ADT given. Since the answer is asking for the distance from the shoulder, I picked 30' as an answer because it is asking for the min. distance. The answer in the book ( the units are incorrect) states the clear zone should be 46', so the answer is 38'
I tend to think this is an error, more so because the units are incorrect as well. The RDG states the clear zone distance is not a precise distance, but rather an approximate center range.
Any thoughts
This is a 2 lane rural freeway with 12' lanes. The ADT is 16,000 and the design speed is 65 MPH. The foreslope off the shoulder to the edge of a tree is shown as a 1V:4H.
Page 3-3, Table 3-1, of the 2004 RDG shows a range of 38'-46' for the speed and ADT given. Since the answer is asking for the distance from the shoulder, I picked 30' as an answer because it is asking for the min. distance. The answer in the book ( the units are incorrect) states the clear zone should be 46', so the answer is 38'
I tend to think this is an error, more so because the units are incorrect as well. The RDG states the clear zone distance is not a precise distance, but rather an approximate center range.
Any thoughts