Openroads designer design standards - need clarification

I'm setting up my design standards and can't find information about how things are done.

I'm looking for information about the "Transition Type Equation" - what is this equation and where does it come from?

Also what does the "Centripetal Acceleration" value does?

Any tips on where to look or explaination is welcome.

I just want to make sure that everything is setup the right way and that the results are good, thanks