Alive by Joy Harjo

"I drive the interstate, watch faces come and go on either side. I am free to be sung to; I am free to sign. This woman can cross any line."

I was not really sure of the reference made by this poem, but this part of the poem stood out to me. The author here uses the reference of "drive the interstate" as a way to express the freedom/escape gained by the women. I feel it kind of relate to Kerovac's On the Road that both shows that traveling serves a way to get away from some sort of distress and discontent.

Question: I feel this poem reflects some sort of the distress and fear faced by the woman and that she wants to get away with it. But I wonder what exactly is this sort of fear or distress that the author is referencing here?