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Chapter 9: Right of Way Change: Change and Clearance Intervals
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The purpose of this activity is to help you build your base of understanding of the change and clearance
intervals.
•
Describe the purpose and method of calculation of the vehicle change and clearance intervals
•
Prepare a completed spreadsheet that includes the following:
Tab 1:
Title page with activity number and title, authors, and date completed
Tab 2:
Calculations and results for Tasks 1 and 2
Tab 3:
Answers to the Critical Thinking Questions
1. In addition to the values assumed in the example in the reading (
v
= 35 miles per hour,
L
= 20 feet,
a
= 10 feet per second per second) for passenger cars, what are the implications in setting the yellow
and red clearance times if the traffic stream also includes trucks with
L
= 58 feet and
a
= 6.4 feet per
second per second? What values for these two timing intervals would you recommend and why?
53
What Do You Know About the Change and
Clearance Intervals?