I will be travelling to the USA (from the UK) and renting a car. I have been looking into the various traffic laws and rules, signage etc. as well as potential routes to take for the journey, and I came across an intersection for which I don't understand the rules.
The intersection appears to be controlled by lights but there are only two lights, rather than three.
These are the different aspects of the lights I can see from Street View (zoomed in). It's not quite clear to me whether the lights may be flashing or alternating, or even off occasionally (or if they're "off" because the camera caught them between aspects).
I am familiar with the rules around typical three-light traffic signals, single flashing yellow (proceed with caution) and single flashing red (treat as stop sign). What are the rules of these two-light signals?
Are there online resources which describe these rules? Are these types of traffic light only found in Alabama, or are they common across the country?