Question

A _____ ft mast arm is used in alleys, a ________ ft mast arm is used in residential areas w/ streets less than 40 ft wide, a _____ ft is used where streets are more than 40 ft wide and in industrial/ commercial areas?

a. 10, 15, 20
b. 15, 20, 25
c. 20, 25, 30
d. 25, 30, 35

Answer 1

For traffic control in different areas, mast arms of varying lengths are used: 15 ft for alleys, 20 ft for residential areas with streets less than 40 ft wide, and 25 ft for wider streets and commercial/industrial areas.

Step-by-step explanation:

The student is asking about the standard lengths of mast arms that are used to support traffic signals or street lights, based on the type of roadway and area they are installed in. A mast arm is an important part of traffic signal design.

In alleys, a 15 ft mast arm is typically used. In residential areas with streets less than 40 ft wide, a 20 ft mast arm is common. Where streets are more than 40 ft wide and in industrial or commercial areas, a 25 ft mast arm is usually implemented. So, the correct answer to the question is option b. 15, 20, 25.