Audible beaconing is the use of an audible signal in such a way that blind pedestrians can home in on the signal coming from the target corner as they cross the street.
Explanation:
Switching from walking to taking the bus would mean a behavioral change that will result in a decrease in activity level. Whereas you were getting some form of physical activity in walking you are now taking the bus which means your level of physical activity has dropped as you will be sitting on the bus not doing anything, before you were actively moving your body.
Uhh, true. Not much context in the the question.
