Problem 5: Signalization of Okeechobee Road

The HCM suggests in Chapter 16 that free-flowing right turns that are not under signal control should be removed entirely from the analysis. We have already established that the northbound and eastbound right turns are free flowing because of channelization. Therefore, neither of these movements will be considered as a part of the signalization.

The current TWSC operation at this intersection provides only one lane for the northbound left turn (see photo). Because of the available space and the capacity advantage of a second lane under signal control, two lanes will be assigned to this movement. In addition, because of the geometrics of this T intersection, the northbound left turn has more of the characteristics of a through movement than a left turn. Therefore, for purposes of signal analysis, the northbound left turn will be considered as a through movement.

The signal analysis sub-problems will be based on the following demand volumes:

Discussion:
Consider the following issue as you proceed through this problem: what criteria is necessary to define right turns as free-flowing right turns? Take a few minutes to consider this question. When you are ready to continue, click continue below to proceed.