Travel Time and Delay Survey Report

Questions and Answers

What is the primary purpose of conducting travel time and delay studies?

To predict future traffic volumes

To assess road maintenance needs

To determine vehicle ownership rates

To evaluate the quality of traffic movement (correct)

Which component does NOT belong in a recommended survey report format?

Description of Funding Sources (correct)

Name of Survey

Appendices

Output

How is running time defined in the context of travel time studies?

Total travel time minus fixed delays

Time taken to traverse the entire route without delays

Average speed throughout the journey

Total travel time excluding stopped time (correct)

What does travel-time delay specifically measure?

The actual time taken minus the time for average speed in uncongested flow. Signup and view all the answers

What type of delay is caused by tangible traffic control devices such as stop signs?

Fixed delay Signup and view all the answers

Which of the following best describes travel-time delay?

Difference between actual travel time and expected travel time under ideal conditions Signup and view all the answers

Which aspect of a travel time and delay study is essential for analyzing the findings?

Analysis Signup and view all the answers

What calculation defines travel speed on a roadway?

Distance divided by travel time Signup and view all the answers

What is the primary purpose of defining control points in a study area?

To provide locations for accurate timing and data collection. Signup and view all the answers

Which technique involves a test vehicle estimating the median speed?

Floating Car Technique Signup and view all the answers

What does the Average Speed Technique rely on?

Driver's perception of representative speed. Signup and view all the answers

In TTD studies, what equipment would NOT typically be used in the Test Car Technique?

Telescope Signup and view all the answers

What does the term 'running speed' refer to in travel time studies?

Average speed along a specified route excluding stopped time Signup and view all the answers

Which of the following techniques prioritizes the posted speed limit during testing?

Maximum-Car Technique Signup and view all the answers

What is the primary purpose of the interview technique in transportation studies?

To collect qualitative travel patterns information Signup and view all the answers

Which of the following is NOT categorized as a technique for TTD studies?

Plate Recognition Technique Signup and view all the answers

Which time periods are recommended for traffic studies?

Early morning and afternoon peak hours Signup and view all the answers

What is the main function of the License Plate Technique?

To obtain travel time information Signup and view all the answers

What minimum sample size is generally considered adequate for the License Plate Technique?

50 license number matches Signup and view all the answers

What can be achieved by using a video survey in traffic studies?

Other activities like turning movements can be observed Signup and view all the answers

What is the key component recorded when a test vehicle stops during the study?

Time, location, and cause for stopping. Signup and view all the answers

What type of graphical representation is a travel time contour map?

A graphical representation of travel time from a central point Signup and view all the answers

What is indicated by the contour lines in a travel time contour map?

Minutes of travel time Signup and view all the answers

Which of the following is NOT a technique for collecting traffic study data?

Weather Assessment Technique Signup and view all the answers

Study Notes

Travel Time and Delay Survey Overview

Surveys aim to assess the quality of traffic movement through travel time and delay analysis.
Results support various studies, including economic impact assessments and level of service evaluations.

Purpose of Travel Time and Delay Studies

Evaluate traffic movement quality.
Compare conditions through “before and after” studies.
Aid in traffic assignment and planning.

Key Definitions

Travel Time Studies: Measure the duration taken to travel a specified route.
Delay Studies: Analyze delays by location, duration, and frequency.
Travel Time: Total elapsed time including stops and delays over a route.
Running Time: Travel time excluding stopped time.
Travel Speed: Average speed calculated by distance divided by travel time.
Delay: Time lost due to traffic factors like control devices.

Types of Delays

Fixed Delay: Occurs regardless of traffic volume; caused by signals or stops.
Operational Delay: Results from interactions with other traffic components.

Travel-Time Delay

Difference between actual travel time and time predicted by average speed during uncongested flow.
Includes variations for acceleration, deceleration, and stopped time.

Methods for Travel Time and Delay Studies

Test Car Technique: Involves a vehicle navigating a designated route while recording travel and delay times.
Floating Car Technique: Driver drives to match median traffic speeds.
Average Speed Technique: Driver estimates representative speeds for observations.
Maximum-Car Technique: Vehicle travels at the speed limit unless impeded.
License Plate Technique: Collects vehicle entry and exit times for travel time calculations.
Interview Technique: Gathers qualitative data from transportation users about travel patterns.

Test Car Technique Details

Materials Needed: Voice recorder, stopwatch, GPS, camera, and vehicle for data collection.
Time and causes of delays are logged throughout the test route for analysis.

Sampling and Conducting Studies

Define control points at study initiation.
Conduct studies during typical traffic conditions, particularly during peak hours.
A sample size of approximately 50 observations can yield sufficient accuracy in findings.

Data Presentation

Graphical representations like time vs. distance and speed vs. distance diagrams can visualize results.
Time contour maps illustrate travel time from a central point, beneficial for route comparisons and planning enhancements.

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Description

This quiz focuses on the essential components of a travel time and delay survey report. It covers the purpose, methodology, and analysis of data collection in transportation studies. Students will learn how to effectively present survey findings and understand the importance of travel time measurements.