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A four way roundabout is a crossroad junction same as any other four way junction.
The only difference is the discipline laid down to navigate it.
Directions are left, right, straight on, or U turn.
All this stuff about you can't turn left is pedantic nonsense.

I'm going on what was cited in the driver's license study guide for a military license in Germany. Mainly though is the sign prior to entry to the RB that shows the routes drivers must take for the lane they use. Those signs are Traffic Control Devices, just like stop signs, speed limit signs, traffic signals at intersections and solid white lines on the roadway. Violation of a traffic control devise is a ticketable offense.

I've been searching also for something that specifically covers this but haven't found anything yet.

You were an idiot!

You should not have entered the roundabout when another driver is in the roundabout.

You can't always tell that someone else is in the roundabout. If you're coming north on Morse toward 466 and approach the roundabout at Sumter Square, you have no way to tell if someone is coming south on Morse, already in the roundabout, but not yet at the Square exit. You can't see the other side of the roundabout from there.

There's another on Morse that has a pump house in the middle, no one can see across from them. In fact, I only know of a couple of roundabouts where you -can- see directly across from your entry point.

Pedantic, perhaps. But people are taking things literally here, and that can result in an accident. What you shouldn't do, is enter the roundabout when you actually see a car approaching your entry point from within the roundabout. There's a 3-exit roundabout on Buena Vista - and you can see clearly all exits, from any entry point. The person coming into the roundabout from your right, is not a problem for you. But the person coming toward you from your left, is a problem for you. You need to wait for him to either exit at your entry point, or pass you and exit beyond your entry point.

Read my post. I STARTED to enter the roundabout. I didn’t enter it. If I had entered it, I would probably not be posting today!!

Over 180 posts showing that there is not agreement about how to drive the roundabouts. Amazing considering its simply merge in, travel through and get out. Lots of misunderstanding about the rules governing travel through the roundabouts. I stay out of them as much as I can.

Too many bad assumptions by drivers.
The key is defensive driving at the appropriate speed.

Wow, how is this post still alive and no one is in poster jail??

Does seem to violate the following;

USERS ARE NOT ALLOWED TO DIRECT COMMENTS TOWARD ANOTHER USER.

Because everyone agrees with me.

We all know no one is supposed to enter a roundabout when there is another car in the roundabout.

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Well said.

I found this bit of info on using a RB.

how to safely exit a multi lane traffic circle - Search

When approaching a multi-lane roundabout, enter the appropriate lane well in advance of the intersection. Once you find a gap in traffic, enter the multi-lane roundabout and travel to your exit. When you leave the traffic circle, use your directional, watch for pedestrians, stay in your lane, and exit safely1.

In a multi-lane roundabout, you will see two signs as you approach the intersection: the same yellow “roundabout ahead” warning sign and speed signs used for single-lane roundabouts, and a black and white “lane choice” sign. This second sign is to help you choose the appropriate lane for the direction you want to exit the roundabout.

Not sure if this completely addresses the issue but it does say that the lane choice sign is a Traffic Control Device.

If that is so, why would they need two lanes in a roundabout? Try waiting at the roundabout by the Savannah center until there is no cars in it and you will back up traffic for a mile or more. Nice idea, but not viable.