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Why bother making such a response? You sound full of yourself.

Generally when a question says something like "4 lane freeway" it means 4 lanes total in both directions. So you would use N = 2 (Number of lanes in the analysis direction). 

Goodluck to everyone. Thanks for all of the help. 

They have an errata out for this problem because it was based on HCM 2000 instead of HCM 2010.  Check out the revised solution: http://ncees.org/wp-content/uploads/2012/11/2015-Civil-TRN-errata.4-10-15.pdf In this revised case they tell you the "measured" FFS so you can just take that value...

That makes sense to me. The school of PE has a problem like that where they give you 2 grades and a design speed and ask you to find the length "using the K value method"..... Its weird that they state the problem like that, almost making it sound like there would be another way to solve for L...

 Thanks guys. On the exam, if asked for SSD on a VC, I will use the L equations from the AASHTO GB solving for S and if asked for a posted speed given L and grades, I will use those same equations to solve for S and compare those S values with the level roadway values (using the appropriate...

Thanks! That would be great. 

Sorry for the confusion. The K value for 30 mph was just another example I was using to convey my confusion. As in, if you were asked what would be the minimum length of a vertical curve given a 30 mph design speed, would you say 200' or would you say it was L=KA (given grades of course) even if...

I realize that I am getting the same maximum speed using the K-value method, I just don't understand how you can theoretically use "SSD on level roadway" to find a maximum speed limit on a vertical curve. It is because when you calculated the Actual SSD (given a length and grades) using the...

Hey Guys, I have a few questions regarding stopping sight distance (SSD) and passing sight distance (PSD) on vertical curves. I am working out a afternoon problem in the school of PE notes which asks you to calculate ACTUAL SSD (its asking for headlight SSD but same thing) on a sag vertical...

Thanks for all of the replies. I think I have a better understanding of it now.

Thanks! It Kept giving me an error when I hit submit thread so I didn't realize the were actually posting.

Hey Guys, Can someone explain what makes up the Lost time in the following capacity (c) equation: c=Ns(g/C) N- no of lanes s- saturation flow rate g- effective green time (Phase Length - Lost Time) = (Green time+ yellow time+ All Red time) - ( Startup and Clearance Times) Why is the...

Hey guys, I am looking through my notes (School of PE) and I am unsure about what exactly makes up cycle lost time (L) in the cycle length time equation (HCM EQ 18-17). I believe from HCM, L is the total all red (clearance) lost time and the total startup lost time for all phases that would be...