A Flashing Yellow Arrow (FYA) can be used to install lead/lag phasing without a left-turn trap. It is also required, in certain situations, by the 2009 Manual on Uniform Traffic Control Devices (MUTCD). So how does it work? And how can it be modeled?
In Synchro, there are 3 methods for reporting signalized intersection delays. This includes:
Each of these methods are macroscopic models, which use equations to determine measures of effectiveness such as delay and queue length. Synchro’s companion model, SimTraffic, is a microscopic simulation model. Microsopic models, like SimTraffic, simulate the movement of individual vehicles. Operational measures of effectiveness are collected on every vehicle and can be summarized in a report. Here I will focus on the 3 macroscopic models listed above and save the comparison between Synchro and SimTraffic for another post.