On a two-lane highway, compared to the baseline, how much does the average travel speed decrease by if passing is allowed on only 60% of the roadway, the free flow speed is 55 mph, and the opposing flow rate is 800 passenger cars/hour?

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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**Question 14**

On a two-lane highway, compared to the baseline, how much does the average travel speed decrease by if passing is allowed on only 60% of the roadway, the free flow speed is 55 mph, and the opposing flow rate is 800 passenger cars/hour?

[Answer box for input]

---

**Explanation:**

This question addresses traffic flow dynamics on a two-lane highway under specific conditions.

- **Given Data**:
  - *Passing is allowed on only 60% of the roadway.*
  - *Free flow speed is 55 mph.*
  - *Opposing flow rate is 800 passenger cars/hour.*

Understanding the influence of passing restrictions and opposing traffic flow on average travel speed is crucial for designing and managing efficient roadway systems. Traffic engineers use these parameters to estimate changes in travel speed and ensure optimal traffic conditions.

**Possible Approach to Solution**:

1. **Baseline Travel Speed**: Analyze the average travel speed without the given constraints.
2. **Impact of Passing Restriction**: Determine how limiting passing to 60% of the roadway affects the speed.
3. **Impact of Opposing Traffic**: Consider how an opposing flow rate of 800 passenger cars/hour influences the travel speed.

By comparing the computed average travel speed under these constraints to the baseline, we can ascertain the decrease in average travel speed. 

Please enter the calculated decrease in the provided answer box.
Transcribed Image Text:**Question 14** On a two-lane highway, compared to the baseline, how much does the average travel speed decrease by if passing is allowed on only 60% of the roadway, the free flow speed is 55 mph, and the opposing flow rate is 800 passenger cars/hour? [Answer box for input] --- **Explanation:** This question addresses traffic flow dynamics on a two-lane highway under specific conditions. - **Given Data**: - *Passing is allowed on only 60% of the roadway.* - *Free flow speed is 55 mph.* - *Opposing flow rate is 800 passenger cars/hour.* Understanding the influence of passing restrictions and opposing traffic flow on average travel speed is crucial for designing and managing efficient roadway systems. Traffic engineers use these parameters to estimate changes in travel speed and ensure optimal traffic conditions. **Possible Approach to Solution**: 1. **Baseline Travel Speed**: Analyze the average travel speed without the given constraints. 2. **Impact of Passing Restriction**: Determine how limiting passing to 60% of the roadway affects the speed. 3. **Impact of Opposing Traffic**: Consider how an opposing flow rate of 800 passenger cars/hour influences the travel speed. By comparing the computed average travel speed under these constraints to the baseline, we can ascertain the decrease in average travel speed. Please enter the calculated decrease in the provided answer box.
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