13. The system of claim 12 , where the third pace corresponds to: a faster pace than a medium pace when the first pace is greater than the second pace, the medium pace when the first pace is approximately equal to the second pace, and a slower pace than the medium pace when the first pace is less than the second pace, where the faster pace, the medium pace, and the slower pace are different.
14. The system of claim 13 , where the faster pace corresponds to a high-level of perceived urgency associated with the user, where the medium pace corresponds to a medium-level of perceived urgency associated with the user, where the medium-level of perceived urgency is less urgent than the high-level of perceived urgency, and where the slower pace corresponds to a low-level of perceived urgency associated with the user, where the low-level of perceived urgency is less urgent than the medium-level of perceived urgency.