Why did Carolyn cross the Road?

To get the turtle to the other side:

Carolyn to the rescue

It hissed at her. Hiss!

Turtle and rescuer. Posing

Pictures of Terrapene carolina carolina and Carolyn Selby by John S. Quarterman, Lowndes County, Georgia, 26 May 2010.

Update: Probably not a box turtle; maybe Maybe a slider turtle, Trachemys scripta?