Highway vs. Freeway

[Jambruins]

I was doing an example problem and the problem stated it was an urban highway. One part of the problem was to find the FFS. They gave the % of heavy trucks, 4% upgrade for 1 mile, 6' clearance left, 10' clearance right, 12' lanes and 1.5 interchanges per mile.

In the answer they used the FFS=BFFS-flw-flc-fn-fid which comes from the HCM freeway section. Why did they use the freeway section instead of the highway section of the HCM? It said right in the problem that it was an urban highway.

Thanks.

 

[Earlybird]

They sometime tend to use the phrase highway and freeway interchangeably. I'd just concentrate of the values that are given to you, to determine the solution methods required.

 

[Vishal]

There is an identical equation for determing FFS for Multi-Lane Highways (HCM Chapter 21, Pg 21-6).

However, in this case since the data give can be used only for the freeway type facility. Look at what data is given and that should tell you what to apply