Recent content by ghim

I hope that somebody will provide me HCM reference #, table #, or anything that I can look up. Here is a problem for the following: On a city street, determine the peak hourly traffic volume, the peak hour factor, and how many lanes should the street have. I solved the first two problems...

sac_engineer, This question was to calculate for ISD using 'ISD=1.47 x V x t' The solutoin says; 1. Left Turn: t=11.5+0.7 x 3 (addtional lan crossed)= 13.6 sec----->> I thought additional lane crossed was 4 (3 lane + 1 left & right turn lane) ISD=1.47 x 60 x 13.6 = 1199.52 ft 2...

I'm a little bit struggling how to get the sight distance for right turning. See this problem below. 50mph posted speed limit only left and right turn movement will occur from the new driveway (i.e. there is no crossing traffic) Design Speed of 60mph Six-12 foot lanes and a 16 foot two way...

Thank you, ptatohed. I got it now.

Thank you for your quick response, ptatohed. However, in the solution for this problem, it says, n1=2.5 instead of 2. Is this correct? I thought n1=2 though. Also, in your answer, a 6-lane road will have an n1=3? or 2? I thought it is 3. I might be wrong......

Trying to solve this super elevation problems. But I don't know how to get the number of lanes rotated. (For the length of tangent runout and length of superelevation, see GDHS 3-25/3-26.) Anybody knows? Thanks in adavnce.... superelevation.pdf

Hi guys, Since I studied Transpo as a depth, I have had a question about the HCM how to determine a number of lanes. Ex) given: 8900 vehicles per day. how many lanes should have the street have? I couldn't find the table in HCM. if anybody knows, please let me know. Thank you guys, in...