Sub-problem 3b: Operational Analysis of the Center Section of Krome Avenue (Class I or II Two-Lane Highway Facility)

What LOS do you expect the results of the analysis to show? This is difficult to determine because of the differences in the criteria used between the two class types. As we will see in the next few pages, the various criteria lead to different estimates for LOS.

Which factor do you expect to determine the level of service on a Class I Facility? In a vast majority of cases involving Class I two-lane roadways, the LOS will be determined by the PTSF. On the rare occasion that the ATS emerges as the determining factor, it is a good idea to revisit the question of whether this really should be considered as a Class I facility. The ATS will generally be the critical determinant of LOS only when the free flow speed is low. A low free flow speed is frequently the result of the same factors that would reduce the driver’s expectation of a high speed. As a Class I facility, the operation of this section of Krome Avenue would probably be considered unacceptable at LOS E. As a Class II facility it would fall into LOS D, only 1/10 of a PTSF percentage point away from LOS C (70.0% vs 70.1%). This raises a separate but frequently stated point about the value of judgment in dealing with thresholds.