Question

question 5 of 10
which three steps might be included in an algorithm for a crosswalk sign?

a. an audible signal sounds through the speaker telling the
pedestrian to wait or cross.

b. a microcontroller inside the start button activates when the
button is pushed.

c. a sensor measures the air temperature and rainfall at the
crosswalk.

d. a timer is activated, holding the appropriate traffic light longer to
allow the pedestrian to cross.

Explanation:

To determine the correct steps for a crosswalk sign algorithm, we analyze each option:

• Option A: An audible signal for pedestrians (wait/cross) is a logical step in a crosswalk sign algorithm to assist visually impaired or others.
• Option B: A microcontroller activating on button push initiates the crosswalk process, so this is a valid step.
• Option C: Measuring air temperature and rainfall is irrelevant to a crosswalk sign's function (which deals with pedestrian traffic and safety, not weather monitoring).
• Option D: Activating a timer to hold the traffic light for pedestrian crossing is essential for safe crossing, so this is a valid step.

So the three steps are A, B, and D.

Answer:

A. An audible signal sounds through the speaker telling the pedestrian to wait or cross.
B. A microcontroller inside the start button activates when the button is pushed.
D. A timer is activated, holding the appropriate traffic light longer to allow the pedestrian to cross.