More on Elegba:

"In the Yoruba pantheon, Elegba is a deity, the divine messenger of Olodumare. Elegba is a guardian, protector and communicator. Through divination, he guides the fate of man. In West Africa and all through the Diaspora he is revered. The Fon call him Legba. He is called Èsú (eshu), Èlegba and Èlegbara among the Yoruba. In Brazil for the practitioners of Candomble, he is Exu. The Lucumi of the New World know him as Eshu Eleggua...

When we examine the name Elegbara, we find it is comprised of two words. The word "ele" means messenger. "Agbara" means power or authority. Accordingly this oriki defines the deity Eshu role as messenger and holder of Olodumare's àsé (power and authority). Symbols such as an Eshu figure holding a calabash, personify this attribute. Omo orisha throughout the Diaspora recognize Eshu Elegbara as a deity that holds the power to make things happen* - good or bad. For this reason he is propitiated to assure that all communication or action will not encounter negative influence or obstruction.

As trickster, Eshu is associated with disorder and destiny in the Yoruba pantheon. As "orisa orita" or "esu orita", orisha of the crossroad or the corners, Elegba represents the transitional or center point of the crossroad where one must make a decision. In this position, Elegba represents all the bewilderment and confusion one faces when attempting to make the proper choice. Once the choice is made, he is involved in the consequences and through his own devices guides us towards and along our proper path."

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More at http://members.tripod.com/omo_ileosikan/id2.html

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My point in posting these last two excerpts is to suggest that Black people and non-Black people who are familiar with hoodoo cultural beliefs {even if they are not believers in Hoodoo} will 'get' more than one meaning from Robert Johnson's lyrics about 'crossroads'

"I went to the cross road
Fell down on my knees
I went to the cross road
Fell down on my knees
Asked the Lord above 'Have mercy now
Save poor Bob if you please'."

-snip-

Did Robert Johnson know that 'the crossroads' had {has} added significance for some people in African American culture?

I believe that he did.