Inadequate address previous problem. This issue is able to only be observed properly when no other traffic is present. Signal regularly fails to detect left-turn only traffic until other traffic comes. Sometimes not even then. Both traffic desiring left turn off ramp, and traffic west bound seeking left-turn off Huntoon. Signal only detected left turn traffic apparently during specific portion of switch cycle that only occurs with other traffic present. With no other traffic it simply doesn’t detect left turning lanes adequately.