If traffic consists of 5% of trucks, for the same length of grade as the grade becomes larger, the analysis volume (or the 15-min passenger-car equivalent flow rate) gets smaller. O True O False
If traffic consists of 5% of trucks, for the same length of grade as the grade becomes larger, the analysis volume (or the 15-min passenger-car equivalent flow rate) gets smaller. O True O False
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:### Traffic Flow Analysis – Question 3
**Question:**
If traffic consists of 5% of trucks, for the same length of grade as the grade becomes larger, the analysis volume (or the 15-min passenger-car equivalent flow rate) gets smaller.
- ☐ True
- ☐ False
**Explanation:**
This question is evaluating your understanding of how traffic flow is affected by the presence of trucks and the steepness of a grade (the incline of a road). In particular, it explores the relationship between the percentage of trucks in traffic, the length and steepness of a grade, and how these factors impact the overall flow rate, measured in passenger-car equivalents.
**Concepts to Understand:**
1. **Traffic Compositions:** Knowing the influence of different types of vehicles (e.g., trucks vs cars).
2. **Grade Effects:** Understanding how longer and steeper grades require greater power and often lower speeds, thereby impacting traffic flow.
3. **Analysis Volume:** Familiarity with traffic metrics such as the 15-minute passenger-car equivalent flow rate, which translates the effect of different vehicles into a common unit for comparison.
**Answering the Question:**
To answer whether the statement is true or false, consider how trucks, which generally move slower on grades and occupy more road space, impact overall traffic flow on increasing grades. More significant grades generally reduce the speed and smoothness of traffic, thus reducing the passenger-car equivalent flow rate.
- If you believe the statement is correct, select "True."
- If you think the statement is incorrect, select "False."
Take your time to think through the relationship between vehicle types, grades, and flow rates.
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