The LOS thresholds for multi-lane highway segments are the same as basic freeway segments. The thresholds for weaving segments on multi-lane highways, however, are different than the thresholds for freeway weaving segments, as presented in

Table 9-10

. The LOS criteria for freeway merge and diverge segments are used for merge and diverge segments on multi-lane highways. See for HCM’s LOS criteria for multi-lane highways.

LOS criteria for two-lane highways are based on three performance measures: ATS, PTSF, and PFFS. ATS is the segment length divided by average travel time for the segment. See

Chapter 4

for definitions of PFFS and PTSF. Additional information, with

example

applications, is available in HCM 7th Edition Chapter 26 (freeway and highway segments), Chapter 27 (freeway weaving), and Chapter 28 (freeway merges and diverges). See

Table 9-11

for the LOS criteria for two-lane highways in the HCM.